Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 10:39:57 PM EST ken.stra...@gmail.com wrote:
> Small ball endmills are available for reasonable prices. See
> https://www.ebay.ca/itm/154526476320 and

With a 1/4" LOC that one looks usable but fragile, ordered 10.
My searching didn't find that one, nice find. I have some bigger 
Monsters, works well for the dollar.

Thanks Ken. Stay well etc.

Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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Re: [Emc-users] need gcode maker

[ken.strauss]

Small ball endmills are available for reasonable prices. See
https://www.ebay.ca/itm/154526476320 and
https://www.ebay.ca/itm/152182318115 for examples from a vendor with whom
I've been happy. Of course tiny ones may have insufficient reach to get to
the bottom of your threads.

-Original Message-
From: gene heskett  
Sent: February 13, 2022 10:14 PM
To: Enhanced Machine Controller (EMC) 
Subject: Re: [Emc-users] need gcode maker

On Sunday, February 13, 2022 6:22:05 PM EST ken.stra...@gmail.com wrote:
> Another possibility would be to make a good approximation to the 
> desired buttress thread using a ball endmill. Mount the stock 
> horizontal on your 4th axis and make multiple passes with the ball 
> endmill with each pass being deeper and nearer to the vertical wall of 
> the buttress thread. Of course the root of the thread would be 
> semi-circular rather than sharp but that is probably a plus to reduce 
> stress risers.

I hadn't considered that, but you may be right about the stress risers, and
they would fit just fine.

I have 1/8" ball nose tools to try a short test cut with, and its worth the
try.

I wasn't thinking far enough outside the box. :o( A 2mm (or 3mm) ball nose
would be icing on the cake.

Thanks Ken.
> -Original Message-
> From: gene heskett 
> Sent: February 13, 2022 5:46 PM
> To: Enhanced Machine Controller (EMC) 
> 
> Subject: Re: [Emc-users] need gcode maker
> 
> On Sunday, February 13, 2022 1:32:05 PM EST ken.stra...@gmail.com
wrote:
> > Thread milling would be a good approach except that I doubt that 
> > Gene has 18-inches of Z-clearance on his small mill to thread the 
> > length of his desired screw plus spindle clearance to mill to the 
> > table might be an issue.
> 
> Yes, one of the reasons for the tiny harmonic drive is the clearance 
> for the gantry to pass over it. The drive is mounted coaxial to the 
> motor on the other side of the motor mount bulkhead of the assembly, 
> and the gantry bottom clears it by about 1/8" going by. Only 85mm in 
> diameter. That won't be a problem in this instance as the drive will 
> actually be bolted to a shelf stuck to the rear of the base frame, 
> with only the chuck projecting over the bed, ditto the tailstock stuck 
> to the front of the base frame left of the Y motor at the same x 
> offset. That should leave room for a hard maple stick around 21" long 
> to carve into a bolt.
> Final length TBD of coarse.
> All driven by the relatively low bending moment on the stick from a 
> 20k rpm bit vs a shaped bit in the sheldon turn at 250 rpms. That 
> would demand a much sharper tool, probably not maintainable for one 
> full sweep the length of the stick.
> 
> Thanks Ken, take care & stay well.
> 
> > -Original Message-
> > From: dave engvall 
> > Sent: February 13, 2022 1:20 PM
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users] need gcode maker
> > 
> > Other options for buttress. DIN |  ANSI .. Either grind a tool out 
> > of
> > M2 or equivalent or go shopping for inserts on the web surplus sites.
> > They won't be cheap but a bit less hassle. Single point thread mill??
> > Lathe sound easier than milling it.
> > 
> > Dave
> > 
> > On 2/13/22 9:37 AM, ken.stra...@gmail.com wrote:
> > > Alternatively one can tilt the stock rather than the head which I 
> > > believe is Gene's plan.
> > > 
> > > -Original Message-
> > > From: Robin Szemeti via Emc-users 
> > > 
> > > Sent: February 13, 2022 12:26 PM
> > > To: Enhanced Machine Controller (EMC) 
> > > 
> > > Cc: Robin Szemeti 
> > > Subject: Re: [Emc-users] need gcode maker
> > > 
> > > If you can tilt the head at an angle, then something as simple as
> > > "G1
> > > X300.00 B30.00" will do it, depending on how you have configured 
> > > the B axis. If you can't  tilt the head, no amount of GCODE will 
> > > help you.
> > > 
> > > I'd just do it on the lathe ...
> > > 
> > > On Sun, 13 Feb 2022 at 16:54, gene heskett 
> 
> wrote:
> > >> Greetings all;
> > >> 
> > >> I have composed a simple butress thread in OpenSCAD, which can 
> > >> save many formats besides the .stl's I feed cura with. Those 
> > >> choices are shown in this list:
> > >> STL
> > >> OFF
> > >> WRL
> > >> AMF
> > >> 3MF
> > >> DXF
> > >> SVG
> > >> CSG
> > >> PDF
> > >> image (png)
> > >> 
> > >> The latter being what you see in the attached png images.
> > >> 
> > >> What is out there that can make gcode out of one of those 
> > >> formats, assuming I can do some creative editing to make the bolt 
> > >> code carve an 18" bolt from a hard maple 2x2 being spun by a B 
> > >> axis as Y slowly advances with aux tables to make the Y axis long 
> > >> enough on both ends on my 6040 mill, and I till use a 60 degree 
> > >> engraving mill in it with a 30 degree wedge under the motor mount 
> > >> to tip it to make the 0 degree load face of the thread with the 
> > >> side of the tool's V. I intend to make the wedge as a hinge if I 
> > >> can print it rigid enough.
> > 

Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 8:14:19 PM EST Chris Albertson wrote:
> It is not the epoxy that is so hard.  It is the filler they mix with
> the epoxy.  Many times it is a kind of glass, not unlike what they use
> to make sand paper.  Other times they mix finely ground bits of steel.
> 
> I used to use a brand of epoxy that sold bottles of pure resin and cans
> of filler.  I could mix what I needed for the job.  Sometimes I'd use
> "micro balloon" filler these are tiny hollow balls of glass.  A gallon
> tub of them weights about as much as an empty tub.  Mixed to a thick
> paste, it cures to a foam you can and with a sure-form rasp.   But if
> you mix the same resin with chopped fiberglass or chopped kevlar fiber
> it is as hard as stone and you'd need an angle grinder to smooth it
> down.  I was building small boats and canoes.
> 
> Yes epoxy can be damaged by UV light.  If doing a gunstock, put 4 or 5
> coats of exterior marine varnish over it.  The marine stuff has UV
> blockers (sunscreen) in it.
> 
Thanks Chris, I guess I hasdn't learned that back in the '60's, and its 
sure way too late to fix it now. In spite of the dents and dings its 
collected in 60 years of knocking around in the deer woods, it still gets 
nice reviews at the range. It all stops when I tell them how much for 
another like it though. I have several months of evenings in it plus a 
hundred 1965 dollars in the custom rough cut blank. It is two different 
pages in the Fajen catalog of the day.

Take care and stay well,

Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 6:22:05 PM EST ken.stra...@gmail.com wrote:
> Another possibility would be to make a good approximation to the
> desired buttress thread using a ball endmill. Mount the stock
> horizontal on your 4th axis and make multiple passes with the ball
> endmill with each pass being deeper and nearer to the vertical wall of
> the buttress thread. Of course the root of the thread would be
> semi-circular rather than sharp but that is probably a plus to reduce
> stress risers.

I hadn't considered that, but you may be right about the stress risers, 
and they would fit just fine.

I have 1/8" ball nose tools to try a short test cut with, and its worth 
the try.

I wasn't thinking far enough outside the box. :o( A 2mm (or 3mm) ball 
nose would be icing on the cake.

Thanks Ken.
> -Original Message-
> From: gene heskett 
> Sent: February 13, 2022 5:46 PM
> To: Enhanced Machine Controller (EMC) 
> Subject: Re: [Emc-users] need gcode maker
> 
> On Sunday, February 13, 2022 1:32:05 PM EST ken.stra...@gmail.com 
wrote:
> > Thread milling would be a good approach except that I doubt that Gene
> > has 18-inches of Z-clearance on his small mill to thread the length
> > of
> > his desired screw plus spindle clearance to mill to the table might
> > be
> > an issue.
> 
> Yes, one of the reasons for the tiny harmonic drive is the clearance
> for the gantry to pass over it. The drive is mounted coaxial to the
> motor on the other side of the motor mount bulkhead of the assembly,
> and the gantry bottom clears it by about 1/8" going by. Only 85mm in
> diameter. That won't be a problem in this instance as the drive will
> actually be bolted to a shelf stuck to the rear of the base frame,
> with only the chuck projecting over the bed, ditto the tailstock stuck
> to the front of the base frame left of the Y motor at the same x
> offset. That should leave room for a hard maple stick around 21" long
> to carve into a bolt.
> Final length TBD of coarse.
> All driven by the relatively low bending moment on the stick from a 20k
> rpm bit vs a shaped bit in the sheldon turn at 250 rpms. That would
> demand a much sharper tool, probably not maintainable for one full
> sweep the length of the stick.
> 
> Thanks Ken, take care & stay well.
> 
> > -Original Message-
> > From: dave engvall 
> > Sent: February 13, 2022 1:20 PM
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users] need gcode maker
> > 
> > Other options for buttress. DIN |  ANSI .. Either grind a tool out of
> > M2 or equivalent or go shopping for inserts on the web surplus sites.
> > They won't be cheap but a bit less hassle. Single point thread mill??
> > Lathe sound easier than milling it.
> > 
> > Dave
> > 
> > On 2/13/22 9:37 AM, ken.stra...@gmail.com wrote:
> > > Alternatively one can tilt the stock rather than the head which I
> > > believe is Gene's plan.
> > > 
> > > -Original Message-
> > > From: Robin Szemeti via Emc-users 
> > > Sent: February 13, 2022 12:26 PM
> > > To: Enhanced Machine Controller (EMC)
> > > 
> > > Cc: Robin Szemeti 
> > > Subject: Re: [Emc-users] need gcode maker
> > > 
> > > If you can tilt the head at an angle, then something as simple as
> > > "G1
> > > X300.00 B30.00" will do it, depending on how you have configured
> > > the
> > > B axis. If you can't  tilt the head, no amount of GCODE will help
> > > you.
> > > 
> > > I'd just do it on the lathe ...
> > > 
> > > On Sun, 13 Feb 2022 at 16:54, gene heskett 
> 
> wrote:
> > >> Greetings all;
> > >> 
> > >> I have composed a simple butress thread in OpenSCAD, which can
> > >> save
> > >> many formats besides the .stl's I feed cura with. Those choices
> > >> are
> > >> shown in this list:
> > >> STL
> > >> OFF
> > >> WRL
> > >> AMF
> > >> 3MF
> > >> DXF
> > >> SVG
> > >> CSG
> > >> PDF
> > >> image (png)
> > >> 
> > >> The latter being what you see in the attached png images.
> > >> 
> > >> What is out there that can make gcode out of one of those formats,
> > >> assuming I can do some creative editing to make the bolt code
> > >> carve
> > >> an 18" bolt from a hard maple 2x2 being spun by a B axis as Y
> > >> slowly advances with aux tables to make the Y axis long enough on
> > >> both ends on my 6040 mill, and I till use a 60 degree engraving
> > >> mill in it with a 30 degree wedge under the motor mount to tip it
> > >> to make the 0 degree load face of the thread with the side of the
> > >> tool's V. I intend to make the wedge as a hinge if I can print it
> > >> rigid enough.
> > >> And PETG seems like it could be the Right Stuff.
> > >> 
> > >> The target of all this tom-foolery is a wood workbench vise screw.
> > >> The 2nd half nut is about half done on my BIQU HX printer as I
> > >> send
> > >> this. So its beginning to look do-able.
> > >> 
> > >> I faintly recall that inkscape had a gcode generator plugin at one
> > >> time, does anyone have a clue how well it works or if it even
> > >> exists
> > > 
> > > today?
> > > 

Re: [Emc-users] need gcode maker

[Chris Albertson]

It is not the epoxy that is so hard.  It is the filler they mix with the
epoxy.  Many times it is a kind of glass, not unlike what they use to make
sand paper.  Other times they mix finely ground bits of steel.

I used to use a brand of epoxy that sold bottles of pure resin and cans of
filler.  I could mix what I needed for the job.  Sometimes I'd use "micro
balloon" filler these are tiny hollow balls of glass.  A gallon tub of them
weights about as much as an empty tub.  Mixed to a thick paste, it cures to
a foam you can and with a sure-form rasp.   But if you mix the same resin
with chopped fiberglass or chopped kevlar fiber it is as hard as stone and
you'd need an angle grinder to smooth it down.  I was building small boats
and canoes.

Yes epoxy can be damaged by UV light.  If doing a gunstock, put 4 or 5
coats of exterior marine varnish over it.  The marine stuff has UV blockers
(sunscreen) in it.


On Sun, Feb 13, 2022 at 4:20 PM gene heskett  wrote:

> On Sunday, February 13, 2022 2:58:02 PM EST dave engvall wrote:
> > With current technology wood glues ( epoxy ) are often stronger than
> > the wood which allows one to machine short sections and glue them
> > together for a composite piece that is as strong as a contiguous
> > part.  I think Gene is talented enough to make a live axis for his
> > lathe that would do a bang up job of making those threads. Going thru
> > the pain to do that is left as an exercise for the local shop. ;-)
> > Nothing is impossible for the person that doesn't have to make it
> > work.
> >
> > Dave
>
> There is another side to the epoxy glue story, well known in gunsmith
> circles, the hardness of well cured epoxy dulling tools rapidly is well
> known, something I found in the middle 1960's while finishing a laminated
> walnut gunstock. It even plays hob with 600 grit wet-r-dry, wet.  I had
> to apply, and power buff to scratch it so the next coat would stick, 18
> coats of a clear epoxy gel coat intended for water ski's before I didn't
> see the glue lines in the finish gloss. Now, nearly 60 years later, that
> gel coat has turned pissy yellow, ruining the original tasty milk
> chocolate color of the walnut under it. I've shot it a bunch, and after 4
> barrels chambered for Ackley-06, is now wearing a Bartlien SS 6.5mm about
> 30" long chambered for Creedmoor and doing groups better than I can see,
> sub inch the first time at the range.
>
> > On 2/13/22 10:32 AM, ken.stra...@gmail.com wrote:
> > > Thread milling would be a good approach except that I doubt that Gene
> > > has 18-inches of Z-clearance on his small mill to thread the length
> > > of his desired screw plus spindle clearance to mill to the table
> > > might be an issue.
> > >
> > > -Original Message-
> > > From: dave engvall 
> > > Sent: February 13, 2022 1:20 PM
> > > To: emc-users@lists.sourceforge.net
> > > Subject: Re: [Emc-users] need gcode maker
> > >
> > > Other options for buttress. DIN |  ANSI .. Either grind a tool out of
> > > M2 or equivalent or go shopping for inserts on the web surplus
> > > sites. They won't be cheap but a bit less hassle. Single point
> > > thread mill??
> > > Lathe sound easier than milling it.
> > >
> > > Dave
> > >
> > > On 2/13/22 9:37 AM, ken.stra...@gmail.com wrote:
> > >> Alternatively one can tilt the stock rather than the head which I
> > >> believe is Gene's plan.
> > >>
> > >> -Original Message-
> > >> From: Robin Szemeti via Emc-users 
> > >> Sent: February 13, 2022 12:26 PM
> > >> To: Enhanced Machine Controller (EMC)
> > >> 
> > >> Cc: Robin Szemeti 
> > >> Subject: Re: [Emc-users] need gcode maker
> > >>
> > >> If you can tilt the head at an angle, then something as simple as
> > >> "G1
> > >> X300.00 B30.00" will do it, depending on how you have configured the
> > >> B axis. If you can't  tilt the head, no amount of GCODE will help
> > >> you.
> > >>
> > >> I'd just do it on the lathe ...
> > >>
> > >> On Sun, 13 Feb 2022 at 16:54, gene heskett 
> wrote:
> > >>> Greetings all;
> > >>>
> > >>> I have composed a simple butress thread in OpenSCAD, which can save
> > >>> many formats besides the .stl's I feed cura with. Those choices are
> > >>> shown in this list:
> > >>> STL
> > >>> OFF
> > >>> WRL
> > >>> AMF
> > >>> 3MF
> > >>> DXF
> > >>> SVG
> > >>> CSG
> > >>> PDF
> > >>> image (png)
> > >>>
> > >>> The latter being what you see in the attached png images.
> > >>>
> > >>> What is out there that can make gcode out of one of those formats,
> > >>> assuming I can do some creative editing to make the bolt code carve
> > >>> an 18" bolt from a hard maple 2x2 being spun by a B axis as Y
> > >>> slowly
> > >>> advances with aux tables to make the Y axis long enough on both
> > >>> ends
> > >>> on my 6040 mill, and I till use a 60 degree engraving mill in it
> > >>> with
> > >>> a 30 degree wedge under the motor mount to tip it to make the 0
> > >>> degree load face of the thread with the side of the tool's V. I
> > >>> intend to make the wedge as 

Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 2:58:02 PM EST dave engvall wrote:
> With current technology wood glues ( epoxy ) are often stronger than
> the wood which allows one to machine short sections and glue them
> together for a composite piece that is as strong as a contiguous
> part.  I think Gene is talented enough to make a live axis for his
> lathe that would do a bang up job of making those threads. Going thru
> the pain to do that is left as an exercise for the local shop. ;-) 
> Nothing is impossible for the person that doesn't have to make it
> work.
> 
> Dave

There is another side to the epoxy glue story, well known in gunsmith 
circles, the hardness of well cured epoxy dulling tools rapidly is well 
known, something I found in the middle 1960's while finishing a laminated 
walnut gunstock. It even plays hob with 600 grit wet-r-dry, wet.  I had 
to apply, and power buff to scratch it so the next coat would stick, 18 
coats of a clear epoxy gel coat intended for water ski's before I didn't 
see the glue lines in the finish gloss. Now, nearly 60 years later, that 
gel coat has turned pissy yellow, ruining the original tasty milk 
chocolate color of the walnut under it. I've shot it a bunch, and after 4 
barrels chambered for Ackley-06, is now wearing a Bartlien SS 6.5mm about 
30" long chambered for Creedmoor and doing groups better than I can see, 
sub inch the first time at the range.

> On 2/13/22 10:32 AM, ken.stra...@gmail.com wrote:
> > Thread milling would be a good approach except that I doubt that Gene
> > has 18-inches of Z-clearance on his small mill to thread the length
> > of his desired screw plus spindle clearance to mill to the table
> > might be an issue.
> > 
> > -Original Message-
> > From: dave engvall 
> > Sent: February 13, 2022 1:20 PM
> > To: emc-users@lists.sourceforge.net
> > Subject: Re: [Emc-users] need gcode maker
> > 
> > Other options for buttress. DIN |  ANSI .. Either grind a tool out of
> > M2 or equivalent or go shopping for inserts on the web surplus
> > sites. They won't be cheap but a bit less hassle. Single point
> > thread mill??
> > Lathe sound easier than milling it.
> > 
> > Dave
> > 
> > On 2/13/22 9:37 AM, ken.stra...@gmail.com wrote:
> >> Alternatively one can tilt the stock rather than the head which I
> >> believe is Gene's plan.
> >> 
> >> -Original Message-
> >> From: Robin Szemeti via Emc-users 
> >> Sent: February 13, 2022 12:26 PM
> >> To: Enhanced Machine Controller (EMC)
> >> 
> >> Cc: Robin Szemeti 
> >> Subject: Re: [Emc-users] need gcode maker
> >> 
> >> If you can tilt the head at an angle, then something as simple as
> >> "G1
> >> X300.00 B30.00" will do it, depending on how you have configured the
> >> B axis. If you can't  tilt the head, no amount of GCODE will help
> >> you.
> >> 
> >> I'd just do it on the lathe ...
> >> 
> >> On Sun, 13 Feb 2022 at 16:54, gene heskett  
wrote:
> >>> Greetings all;
> >>> 
> >>> I have composed a simple butress thread in OpenSCAD, which can save
> >>> many formats besides the .stl's I feed cura with. Those choices are
> >>> shown in this list:
> >>> STL
> >>> OFF
> >>> WRL
> >>> AMF
> >>> 3MF
> >>> DXF
> >>> SVG
> >>> CSG
> >>> PDF
> >>> image (png)
> >>> 
> >>> The latter being what you see in the attached png images.
> >>> 
> >>> What is out there that can make gcode out of one of those formats,
> >>> assuming I can do some creative editing to make the bolt code carve
> >>> an 18" bolt from a hard maple 2x2 being spun by a B axis as Y
> >>> slowly
> >>> advances with aux tables to make the Y axis long enough on both
> >>> ends
> >>> on my 6040 mill, and I till use a 60 degree engraving mill in it
> >>> with
> >>> a 30 degree wedge under the motor mount to tip it to make the 0
> >>> degree load face of the thread with the side of the tool's V. I
> >>> intend to make the wedge as a hinge if I can print it rigid enough.
> >>> And PETG seems like it could be the Right Stuff.
> >>> 
> >>> The target of all this tom-foolery is a wood workbench vise screw.
> >>> The 2nd half nut is about half done on my BIQU HX printer as I send
> >>> this. So its beginning to look do-able.
> >>> 
> >>> I faintly recall that inkscape had a gcode generator plugin at one
> >>> time, does anyone have a clue how well it works or if it even
> >>> exists
> >> 
> >> today?
> >> 
> >>> Synaptic does not look promising but I installed inscape and
> >>> friends
> >>> anyway, and of coarse pycam, and I just found dxf2gcode, so that
> >>> got
> >>> installed.
> >>> 
> >>> Does anyone else have a better idea?
> >>> 
> >>> Thanks All;
> >>> Cheers, Gene Heskett.
> >>> --
> >>> 
> >>> "There are four boxes to be used in defense of liberty:
> >>>soap, ballot, jury, and ammo. Please use in that order."
> >>> 
> >>> -Ed Howdershelt (Author, 1940)
> >>> If we desire respect for the law, we must first make the law
> >>> respectable.>>> 
> >>>- Louis D. Brandeis
> >>> 
> >>> Genes Web page 
> 

Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 2:58:02 PM EST dave engvall wrote:
> With current technology wood glues ( epoxy ) are often stronger than
> the wood which allows one to machine short sections and glue them
> together for a composite piece that is as strong as a contiguous
> part.  I think Gene is talented enough to make a live axis for his
> lathe that would do a bang up job of making those threads. Going thru
> the pain to do that is left as an exercise for the local shop. ;-) 
> Nothing is impossible for the person that doesn't have to make it
> work.
> 
> Dave

Chuckle, thanks for pointing that out Dave. The main reason for not using 
the lathe is the difference in reaction forces of the lathe using a 
slowly moving tool in constant contact vs a 20,000 rpm engraving bit is 
the reason for wanting to use the 20,000 rpm tool, not to mention the 
moving engraving bit will leave a much smoother surface that a good stiff 
brush full of warm carnaba will lube virtually forever. Cutting it on the 
lathe will likely cut it 2+ mm fat in the center of the z span because of 
that difference.

Take care and stay well.

Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





___
Emc-users mailing list
Emc-users@lists.sourceforge.net
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Re: [Emc-users] need gcode maker

[Ralph Stirling]

I won't promise it does.  It's been a while since I last played with it.  Even 
if it doesn't, it may be possible to pretend you are machining a slot in the 
X-Z plane and use that for a lathe profile.

-- Ralph

On Feb 13, 2022 2:37 PM, Chris Albertson  wrote:
CAUTION: This email originated from outside the Walla Walla University email 
system.


On Sun, Feb 13, 2022 at 10:42 AM Ralph Stirling <
ralph.stirl...@wallawalla.edu> wrote:

> Freecad "path" workbench generates g-code toolpaths.  You can paste your
> openscad source code into freecad with the openscad workbench.
>

Will it handle this part, a lead screw?  Last I looked, Path Workbench only
did 2.5D milling.  It would be great if it would do this.  I assume you
have to use a 4-axis machine to mill a leadscrew or a CNC Lathe.It it
has been upgraded, I'll download it again and test it ou

>
> --

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] need gcode maker

[ken.strauss]

Another possibility would be to make a good approximation to the desired
buttress thread using a ball endmill. Mount the stock horizontal on your 4th
axis and make multiple passes with the ball endmill with each pass being
deeper and nearer to the vertical wall of the buttress thread. Of course the
root of the thread would be semi-circular rather than sharp but that is
probably a plus to reduce stress risers. 

-Original Message-
From: gene heskett  
Sent: February 13, 2022 5:46 PM
To: Enhanced Machine Controller (EMC) 
Subject: Re: [Emc-users] need gcode maker

On Sunday, February 13, 2022 1:32:05 PM EST ken.stra...@gmail.com wrote:
> Thread milling would be a good approach except that I doubt that Gene 
> has 18-inches of Z-clearance on his small mill to thread the length of 
> his desired screw plus spindle clearance to mill to the table might be 
> an issue.

Yes, one of the reasons for the tiny harmonic drive is the clearance for the
gantry to pass over it. The drive is mounted coaxial to the motor on the
other side of the motor mount bulkhead of the assembly, and the gantry
bottom clears it by about 1/8" going by. Only 85mm in diameter. 
That won't be a problem in this instance as the drive will actually be
bolted to a shelf stuck to the rear of the base frame, with only the chuck
projecting over the bed, ditto the tailstock stuck to the front of the base
frame left of the Y motor at the same x offset. That should leave room for a
hard maple stick around 21" long to carve into a bolt. 
Final length TBD of coarse.
All driven by the relatively low bending moment on the stick from a 20k rpm
bit vs a shaped bit in the sheldon turn at 250 rpms. That would demand a
much sharper tool, probably not maintainable for one full sweep the length
of the stick.

Thanks Ken, take care & stay well.

> -Original Message-
> From: dave engvall 
> Sent: February 13, 2022 1:20 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] need gcode maker
> 
> Other options for buttress. DIN |  ANSI .. Either grind a tool out of
> M2 or equivalent or go shopping for inserts on the web surplus sites.
> They won't be cheap but a bit less hassle. Single point thread mill??
> Lathe sound easier than milling it.
> 
> Dave
> 
> On 2/13/22 9:37 AM, ken.stra...@gmail.com wrote:
> > Alternatively one can tilt the stock rather than the head which I 
> > believe is Gene's plan.
> > 
> > -Original Message-
> > From: Robin Szemeti via Emc-users 
> > Sent: February 13, 2022 12:26 PM
> > To: Enhanced Machine Controller (EMC) 
> > 
> > Cc: Robin Szemeti 
> > Subject: Re: [Emc-users] need gcode maker
> > 
> > If you can tilt the head at an angle, then something as simple as 
> > "G1
> > X300.00 B30.00" will do it, depending on how you have configured the 
> > B axis. If you can't  tilt the head, no amount of GCODE will help 
> > you.
> > 
> > I'd just do it on the lathe ...
> > 
> > On Sun, 13 Feb 2022 at 16:54, gene heskett 
wrote:
> >> Greetings all;
> >> 
> >> I have composed a simple butress thread in OpenSCAD, which can save 
> >> many formats besides the .stl's I feed cura with. Those choices are 
> >> shown in this list:
> >> STL
> >> OFF
> >> WRL
> >> AMF
> >> 3MF
> >> DXF
> >> SVG
> >> CSG
> >> PDF
> >> image (png)
> >> 
> >> The latter being what you see in the attached png images.
> >> 
> >> What is out there that can make gcode out of one of those formats, 
> >> assuming I can do some creative editing to make the bolt code carve 
> >> an 18" bolt from a hard maple 2x2 being spun by a B axis as Y 
> >> slowly advances with aux tables to make the Y axis long enough on 
> >> both ends on my 6040 mill, and I till use a 60 degree engraving 
> >> mill in it with a 30 degree wedge under the motor mount to tip it 
> >> to make the 0 degree load face of the thread with the side of the 
> >> tool's V. I intend to make the wedge as a hinge if I can print it 
> >> rigid enough.
> >> And PETG seems like it could be the Right Stuff.
> >> 
> >> The target of all this tom-foolery is a wood workbench vise screw.
> >> The 2nd half nut is about half done on my BIQU HX printer as I send 
> >> this. So its beginning to look do-able.
> >> 
> >> I faintly recall that inkscape had a gcode generator plugin at one 
> >> time, does anyone have a clue how well it works or if it even 
> >> exists
> > 
> > today?
> > 
> >> Synaptic does not look promising but I installed inscape and 
> >> friends anyway, and of coarse pycam, and I just found dxf2gcode, so 
> >> that got installed.
> >> 
> >> Does anyone else have a better idea?
> >> 
> >> Thanks All;
> >> Cheers, Gene Heskett.
> >> --
> >> 
> >> "There are four boxes to be used in defense of liberty:
> >>   soap, ballot, jury, and ammo. Please use in that order."
> >> 
> >> -Ed Howdershelt (Author, 1940)
> >> If we desire respect for the law, we must first make the law 
> >> respectable.>>
> >>   - Louis D. Brandeis
> >> 
> >> Genes Web page 

Re: [Emc-users] who has used thin client pcs

[Andy Howell]

On 2/12/22 16:01, Thaddeus Waldner wrote:

On using an ssd.

Booting from an ssd is now supported by the pi but you need to configure the 
eeprom to enable it. This is pretty easy using the official raspberry pi imager.

I have this usb3 adapter and an intel pro 5450 ssd.

StarTech.com SATA to USB Cable - USB 3.0 to 2.5” SATA III Hard Drive Adapter - 
External Converter for SSD/HDD Data Transfer (USB3S2SAT3CB) 
https://www.amazon.com/dp/B00HJZJI84/ref=cm_sw_r_cp_api_glt_i_QJ8MJKXAVFV5RQNRRJ88?_encoding=UTF8=1

Read/write performance is about 10 x as fast as the Samsung u3 sd card I’m 
using now.

However, I had little luck using the ssd with LinuxCNC because it caused the 
latency jitter to jump to 600,000 or higher.

Has anyone had any luck with LinuxCNC on SSDs?


I have a working 2.7.2 system on Wheezy using an SSD. No problems so 
far, but I never checked the latency. The old hard disk died. I'll check 
the latency out of curiosity.


I also have new motherboard with an SSD that has latency problems, but I 
don't know that the SSD is the cause.





On Feb 12, 2022, at 3:29 PM, Chris Albertson  wrote:

I'm not Gene, but can answer (let's see if he agrees...)

1) the Pi4 is far better than the Pi3 in two ways,  The Pi3 had only 1GB
RAM but you can buy a Pi4 with 1, 2, 4 or 8GB installed RAM.   4GB seems to
be the price/performance sweet spot. and just as important the Pi4
network and USB speed are dramatically increased.The CPU is only an
incremental improvement over the Pi3.   But faster I/O and more RAM move
the Pi4 into a different class.

2) I am pretty sure Gene uses the SPI serial interface to connect the Mesa
card.  This is a short-distance link.  I would keep the SPI wires to about
200mm at most but I don't know what Gene does.  SPI would use four short
"Dupont" jumper wires.In theory you can go over a meter but, keep it as
short as you can.

3) the Pi4's I/O is now fast enough that the SD card is a bottleneck.   If
using the Pi4 as a general purpose computer install a "real" SSD drive
using USB3  A cheap 256GB SSD is better then any SD card and will last
longer.   The other option for storage in the Pi4 is what I do, I use an
NFS mount from a NAS.   using the NAS makes the Pi4 faster and it means I
never have to move files between computers.   Any decent NAS box can
"flood" a 1 gigabit Ethernet cable so so get 100MB/sec storage.


On Fri, Feb 11, 2022 at 8:06 PM Martin Dobbins  wrote:

Hi Gene,

A couple of questions:

I think you started with a rpi3, how does the rpi4 compare?

How do you wire the gpio on the rpi4 to the 7i90HD? any links for cables
etc?

Thanks, Martin





On Thursday, February 10, 2022 3:05:57 PM EST Chris Albertson wrote:
Yes, "Mini ITX" is just a shape and a standard for where mounting holes
go but it is a shape that is sold to a cost-sensitive market where low
power ususage and low cost maters.  The ITX market is large enough
that mass production drives prices down.  So it is a good fit to
hobby-level machine control.   I would think a good place to look as
Aliexpress as most of this stuff ships from China at very low cost.

If you are never going to use the computer as an interactive desktop
you could use a Raspberry Pi4.Then use any standard PC notebook to
remote log-in and run the display from the notebook over WiFi.   A Pi4
is 1/2 the cost of the cheapest ITX board.

I did this just to see if I could, but the interfacing from the pi to the
lathe IS the cost of the ITX board over and above the 2 gig rpi4. When I
did it, the 7i90HD was suggested, but while it has numerous ways to
configure 72 i/o's, its fpga has no buffering and the 3 50 in i/o sockets
are a PITA to wire uo to, and leave the fpga wide open to being blown by
noise fron ground loops etc. Enter the 7i42TA, the protection magic for
the 7i90HD, but it takes 3 of them. Now I think it would survive the EMP
of a tactical nuke. And because the i/o is there, and now on green
terminal strips that are much easier to wire, I have all sorts of extra
stuff hooked up and running, like a pair of $20 100ppr dials to replace
the missing cranks, speed selectable on a 1,2,5 etc scale from .0001" to
20 thou per click, one per powered axis. All the modular outputs were
used from gpio-0 to the end of the config installed, and I used the gpio
from gpio-71 down for such things as controlling ALL the lathe power with
a couple 40 amp AC SSR's which are switched by the state of F2. I could
go on, but if this lathe ever grows a controllable tool changer like the
EMCO-5 or similar I have buckets of i/o currently unused.

And that rpi4 is running the full desktop raspian buster install. With a
preempt-rt kernel I built on that rpi4. Obviously I shouldn't run FF at
the same time as LCNC as FF plays hell with the latency, but I have
carved air while running FF just to hear it stutter. And it does, but
nothing else seems to bother it that much.

I'm useing the SPI interface version of the 

Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 1:05:48 PM EST Ralph Stirling wrote:
> Freecad "path" workbench generates g-code toolpaths.  You can paste
> your openscad source code into freecad with the openscad workbench.
> 
> -- Ralph

That would be the latest AppImage I assume? My version is a couple months 
old. It can open the .stl, but not the .scad, that I can find, version 
.20 of FreeCAD AppImage. So I dl'd this weeks build. It still coldn't 
import .scad or .csg files, complaining it could not find the OpenSCAD 
executables. Got that fixed, but now its complaining about stuff that 
OUGHT to be in the AppImage:
Traceback (most recent call last):
  File "", line 1, in 
  File "/tmp/.mount_FreeCAE3Q5v7/usr/Mod/OpenSCAD/importCSG.py", line 
124, in open
tmpfile = callopenscad(filename)
  File "/tmp/.mount_FreeCAE3Q5v7/usr/Mod/OpenSCAD/OpenSCADUtils.py", line 
212, in callopenscad
check_output2([osfilename, '-o', outputfilename, inputfilename])
  File "/tmp/.mount_FreeCAE3Q5v7/usr/Mod/OpenSCAD/OpenSCADUtils.py", line 
182, in check_output2
raise OpenSCADError('%s %s\n' % (stdoutd.strip(),stderrd.strip()))
: " bash: /tmp/.mount_FreeCAE3Q5v7/
usr/lib/libtinfo.so.6: no version information available (required by 
bash)\n/tmp/.mount_OpenSCCCJNMO/AppRun.wrapped: /tmp/.mount_FreeCAE3Q5v7/
usr/lib/libQt5Core.so.5: version `Qt_5.15' not found (required by /
tmp/.mount_OpenSCCCJNMO/AppRun.wrapped)\n"

And to get Qt_5.15 is at least another 2 gigs of dependencies that pulls 
in. Is there no end to the hunger?

Thanks Ralph.

Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 5:37:08 PM EST Chris Albertson wrote:
> On Sun, Feb 13, 2022 at 10:42 AM Ralph Stirling <
> 
> ralph.stirl...@wallawalla.edu> wrote:
> > Freecad "path" workbench generates g-code toolpaths.  You can paste
> > your openscad source code into freecad with the openscad workbench.
> Will it handle this part, a lead screw?  Last I looked, Path Workbench
> only did 2.5D milling.  It would be great if it would do this.  I
> assume you have to use a 4-axis machine to mill a leadscrew or a CNC
> Lathe.It it has been upgraded, I'll download it again and test it
> ou
Not even todays weekly AppImage can paste it, import the csg, yes but 
goes nuts for about 10 minutes complaining about the missing qt-5 5.15 
stuff and winds up displaying nothing.

If its going to be this picky, I'll just write it by hand once I get all 
the mill accessories made, installed and calibrated, should be about 70 
lines in two loops. First loop to set the depth, 2nd to drive y as a sub 
to 1st, maybe with a seperate leading z depth, y run to turn to shave it 
round 1st. Make it 110 LOC. I love loops. I hate writing g-code that does 
nothing but unwinds a @$#%* loop.

This looks like simple code, sightly over a screen full vertically, but 
it needs 24g of the 32g in this machine to render it. And takes the 
latest OpenSCAD 10 minutes to f6 the half nut. The scad is attached.

> > --
> 
> Chris Albertson
> Redondo Beach, California
> 
> ___
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> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
> .


Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 
// Simple Butress threads for vise screw
// By Maurice E. Heskett, translated from wikipedia drawings, in Feb 2022
// included angle of cutting tool 45 degrees
// pitch p in mm
// option 1 ratios d=3/4p & f=1/8p
// option 2 ratios d=2/3p & f=1/6p
// major diameter 2" or 50.8mm
lmbr=50.8;// thickness of lumber
mdt=lmbr-6;// is 3mm per side of thread depth
tol=-.3;// set fit clearance from 2" is half nozzle +.1mm
od=mdt;// set od of internal thread
pitch=4;// mm
an1=30; // fixed angle for 90 degree workface
an2=0;
an=an1+an2;
f=pitch*.125; //option 1 
d1=pitch*.75;//set depth of tooth
//tr=mdt-(pitch*.75)/2;// set depth of tooth relative to md
echo(14,lmbr,mdt,tol,od,pitch,d1,f); // show points so far
module buttress_thread(tol)
{// generate the thread shape, + Z tilted so edge is at thread pitch
translate([0,.25,0])rotate([95,0,0])
{
translate([0,1.5,0])cube([.5,d1,1.6],center=true);
difference()
{
translate([0,pitch+.5,0])
rotate([0,0,an])
cylinder(h=1.6,d=d1*2.5,center=true,$fn=3);
translate([3.875,pitch+1.65,.1])
rotate([0,.0,0])
cube([2.5,2.4,1.85],center=true);
}
}
};

module buttress_bolt(tol)
{
echo(39,tol);
difference()
{
union()
{ $fn=180;
translate([0,0,25.4]) cylinder(h=50.8,d=od+tol,center=true);
for(i=[0:2:359*4.7])// 4,6 2 start threads
{ k=i/30;
rotate([0,0,i])translate([.5*(mdt+tol),0,-7+k])buttress_thread();
rotate([0,0,i+180])translate([.5*(mdt+tol),0,-7+k])buttress_thread();
}
}
translate([0,0,-6])cylinder(h=6,d=55,true);
translate([0,0,50.35])cylinder(h=6,d=55,true);
}
};

module buttress_halfnut(tol)
{
difference()
 {
echo(61,tol);
translate([16,0,24.7]) cube([32,66,49],center=true);
buttress_bolt(tol);
}
};

//buttress_thread(0);
buttress_bolt(-.3);
//buttress_halfnut(.3);
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Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 1:32:05 PM EST ken.stra...@gmail.com wrote:
> Thread milling would be a good approach except that I doubt that Gene
> has 18-inches of Z-clearance on his small mill to thread the length of
> his desired screw plus spindle clearance to mill to the table might be
> an issue.

Yes, one of the reasons for the tiny harmonic drive is the clearance for 
the gantry to pass over it. The drive is mounted coaxial to the motor on 
the other side of the motor mount bulkhead of the assembly, and the 
gantry bottom clears it by about 1/8" going by. Only 85mm in diameter. 
That won't be a problem in this instance as the drive will actually be 
bolted to a shelf stuck to the rear of the base frame, with only the 
chuck projecting over the bed, ditto the tailstock stuck to the front of 
the base frame left of the Y motor at the same x offset. That should 
leave room for a hard maple stick around 21" long to carve into a bolt. 
Final length TBD of coarse.
All driven by the relatively low bending moment on the stick from a 20k 
rpm bit vs a shaped bit in the sheldon turn at 250 rpms. That would 
demand a much sharper tool, probably not maintainable for one full sweep 
the length of the stick.

Thanks Ken, take care & stay well.

> -Original Message-
> From: dave engvall 
> Sent: February 13, 2022 1:20 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] need gcode maker
> 
> Other options for buttress. DIN |  ANSI .. Either grind a tool out of
> M2 or equivalent or go shopping for inserts on the web surplus sites.
> They won't be cheap but a bit less hassle. Single point thread mill??
> Lathe sound easier than milling it.
> 
> Dave
> 
> On 2/13/22 9:37 AM, ken.stra...@gmail.com wrote:
> > Alternatively one can tilt the stock rather than the head which I
> > believe is Gene's plan.
> > 
> > -Original Message-
> > From: Robin Szemeti via Emc-users 
> > Sent: February 13, 2022 12:26 PM
> > To: Enhanced Machine Controller (EMC)
> > 
> > Cc: Robin Szemeti 
> > Subject: Re: [Emc-users] need gcode maker
> > 
> > If you can tilt the head at an angle, then something as simple as "G1
> > X300.00 B30.00" will do it, depending on how you have configured the
> > B axis. If you can't  tilt the head, no amount of GCODE will help
> > you.
> > 
> > I'd just do it on the lathe ...
> > 
> > On Sun, 13 Feb 2022 at 16:54, gene heskett  
wrote:
> >> Greetings all;
> >> 
> >> I have composed a simple butress thread in OpenSCAD, which can save
> >> many formats besides the .stl's I feed cura with. Those choices are
> >> shown in this list:
> >> STL
> >> OFF
> >> WRL
> >> AMF
> >> 3MF
> >> DXF
> >> SVG
> >> CSG
> >> PDF
> >> image (png)
> >> 
> >> The latter being what you see in the attached png images.
> >> 
> >> What is out there that can make gcode out of one of those formats,
> >> assuming I can do some creative editing to make the bolt code carve
> >> an 18" bolt from a hard maple 2x2 being spun by a B axis as Y slowly
> >> advances with aux tables to make the Y axis long enough on both ends
> >> on my 6040 mill, and I till use a 60 degree engraving mill in it
> >> with
> >> a 30 degree wedge under the motor mount to tip it to make the 0
> >> degree load face of the thread with the side of the tool's V. I
> >> intend to make the wedge as a hinge if I can print it rigid enough.
> >> And PETG seems like it could be the Right Stuff.
> >> 
> >> The target of all this tom-foolery is a wood workbench vise screw.
> >> The 2nd half nut is about half done on my BIQU HX printer as I send
> >> this. So its beginning to look do-able.
> >> 
> >> I faintly recall that inkscape had a gcode generator plugin at one
> >> time, does anyone have a clue how well it works or if it even exists
> > 
> > today?
> > 
> >> Synaptic does not look promising but I installed inscape and friends
> >> anyway, and of coarse pycam, and I just found dxf2gcode, so that got
> >> installed.
> >> 
> >> Does anyone else have a better idea?
> >> 
> >> Thanks All;
> >> Cheers, Gene Heskett.
> >> --
> >> 
> >> "There are four boxes to be used in defense of liberty:
> >>   soap, ballot, jury, and ammo. Please use in that order."
> >> 
> >> -Ed Howdershelt (Author, 1940)
> >> If we desire respect for the law, we must first make the law
> >> respectable.>> 
> >>   - Louis D. Brandeis
> >> 
> >> Genes Web page 
> >> ___
> >> Emc-users mailing list
> >> Emc-users@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/emc-users
> > 
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> > 
> > 
> > 
> > ___
> > Emc-users mailing list
> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
> 
> 

Re: [Emc-users] need gcode maker

[Chris Albertson]

On Sun, Feb 13, 2022 at 10:42 AM Ralph Stirling <
ralph.stirl...@wallawalla.edu> wrote:

> Freecad "path" workbench generates g-code toolpaths.  You can paste your
> openscad source code into freecad with the openscad workbench.
>

Will it handle this part, a lead screw?  Last I looked, Path Workbench only
did 2.5D milling.  It would be great if it would do this.  I assume you
have to use a 4-axis machine to mill a leadscrew or a CNC Lathe.It it
has been upgraded, I'll download it again and test it ou

>
> --

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 1:24:54 PM EST Chris Albertson wrote:
> First off this is a really simple design.   I think it could be done on
> a normal manual lathe with no CNC. Just use the correct thread cutting
> gears to drive the carriage.
> 
> The trouble is that writing g-code by hand or turning handwhels with no
> computer breaks the chain that goes from your design file to the
> product. You have to in effect re-design the product.  It is easy in
> this simple case but what if the product was something like the
> housing for a motorcycle transition?  There is no way on Earth you'd
> hand-code that.   So I can see the need to perfect a workflow that
> connects CAD models to a 4-axis mill that has no air gaps.

Potentially 5 axis. But this B is so big, 5 may not be able to fit in the 
available Z. 

That is what I'm looking for Chris. But freecad wants nearly all of 
Qt_5.15, and has burned up an additional 20% of the / drive, a 500GB SSD. 
is now up to 35% use.  And thats just trying to satisfy the weekly 940 
meg freecad AppImage that is supposed to have ALL its dependencies in the 
AppImage. At this rate, I'll have to buy 4 more 500g SSD's and another 
controller card for /.  Can mdadm handle 2 raid10's?

> So what you are looking for is traditional "CAM" software.  This is the
> software that looks at you model and figureout a toolpath. It might do
> roughy cuts first then change the tool and do more.

Not a problem. installing the wedge if its not made adjustable so it can 
be backed to zero, is.  As is the kinematics of a Y caused by that tilt 
around the x axis. I'll have to make a hinge at least an inch thick with 
V notches in the upper faces to give me a measuremeant point to use to 
translate distance into degrees by standard trig functions. Picky but 
doable with instructions painted on the wall. :o) 

> The software has
> to figure this out based on using only the tool you already have and
> it needs to know about you mill so it can get the spindle speeds and
> cut rates right.  It is not simple.  It is so non-simple that there is
> not much open source software to do this.
> 
> If you Google "CAM Software" you get a lot of hits.
> 
> This websites lists the top 16 CAM software systems, these that can
> drive a CNC mill or lathe
> https://www.g2.com/categories/computer-aided-manufacturing?tab=highest_
> rated
> 
> If you are looking from free software, the list is short.  FreeCAD can
> do some things but is limited to "mostly flat" 3D and 2.5D milling.
> 
> Fusion can generate g-code for lathes and do full 5-axis milling It can
> do a simulation and can pretty much do anything. but the free version
> is limited to 3-axis only with no automatic tool changes.   So you
> have to set up one job for each tool.
> 
> 
> There is also PyCAM but it is more limited then FreeCAD
> 
> I think that is the full list of free software.

[...]

That would disapoint, but not surprise me, TANSTAAFL is a universal law 
that not even George Soros can violate.

I can and have written gcode more complex than this, but its reached the 
point where it will probably cost me at least this $140 stick of hard 
maple to get it dead right.

The 2nd half nut is finished, and faced to each other, you can't find the 
joint where they are resting against each other, even I am impressed.

So next is the wedging hinge, but first go measure the existing mount. 
The table extensions to absorb the lengths of the B drive and it tail 
stock, making nearly the full 600mm y travel available for working 
envelope are yet another problem. But that just squares, albeit good 
ones.  A good test of the printer, one my ender5 could never pass by 
1/4". Creality is generally pretty poorly built, haven't found a square 
one yet in 3 of them. Prusa MK3S+ yet to be tested, its a good printer, 
when it works, but ATM the hot end thermister has gone berzakers above 
200C. This BIQU BX came with an H2 head destroyed by a Chinese gorilla 
over tightening things, but since replaceing it at my cost, has been 
nothing short of amazing.

Take care Chris, and stay well.

Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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Re: [Emc-users] need gcode maker

[dave engvall]

With current technology wood glues ( epoxy ) are often stronger than the 
wood which allows one to machine short sections and glue them together 
for a composite piece that is as strong as a contiguous part.  I think 
Gene is talented enough to make a live axis for his lathe that would do 
a bang up job of making those threads. Going thru the pain to do that is 
left as an exercise for the local shop. ;-)  Nothing is impossible for 
the person that doesn't have to make it work.


Dave

On 2/13/22 10:32 AM, ken.stra...@gmail.com wrote:

Thread milling would be a good approach except that I doubt that Gene has 
18-inches of Z-clearance on his small mill to thread the length of his desired 
screw plus spindle clearance to mill to the table might be an issue.

-Original Message-
From: dave engvall 
Sent: February 13, 2022 1:20 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] need gcode maker

Other options for buttress. DIN |  ANSI .. Either grind a tool out of M2 or 
equivalent or go shopping for inserts on the web surplus sites. They won't be 
cheap but a bit less hassle.
Single point thread mill??
Lathe sound easier than milling it.

Dave

On 2/13/22 9:37 AM, ken.stra...@gmail.com wrote:

Alternatively one can tilt the stock rather than the head which I
believe is Gene's plan.

-Original Message-
From: Robin Szemeti via Emc-users 
Sent: February 13, 2022 12:26 PM
To: Enhanced Machine Controller (EMC)

Cc: Robin Szemeti 
Subject: Re: [Emc-users] need gcode maker

If you can tilt the head at an angle, then something as simple as "G1
X300.00 B30.00" will do it, depending on how you have configured the B axis.
If you can't  tilt the head, no amount of GCODE will help you.

I'd just do it on the lathe ...

On Sun, 13 Feb 2022 at 16:54, gene heskett  wrote:


Greetings all;

I have composed a simple butress thread in OpenSCAD, which can save
many formats besides the .stl's I feed cura with. Those choices are
shown in this list:
STL
OFF
WRL
AMF
3MF
DXF
SVG
CSG
PDF
image (png)

The latter being what you see in the attached png images.

What is out there that can make gcode out of one of those formats,
assuming I can do some creative editing to make the bolt code carve
an 18" bolt from a hard maple 2x2 being spun by a B axis as Y slowly
advances with aux tables to make the Y axis long enough on both ends
on my 6040 mill, and I till use a 60 degree engraving mill in it with
a 30 degree wedge under the motor mount to tip it to make the 0
degree load face of the thread with the side of the tool's V. I
intend to make the wedge as a hinge if I can print it rigid enough.
And PETG seems like it could be the Right Stuff.

The target of all this tom-foolery is a wood workbench vise screw.
The 2nd half nut is about half done on my BIQU HX printer as I send this.
So its beginning to look do-able.

I faintly recall that inkscape had a gcode generator plugin at one
time, does anyone have a clue how well it works or if it even exists

today?

Synaptic does not look promising but I installed inscape and friends
anyway, and of coarse pycam, and I just found dxf2gcode, so that got
installed.

Does anyone else have a better idea?

Thanks All;
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
   soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
   - Louis D. Brandeis
Genes Web page 
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Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 12:37:31 PM EST ken.stra...@gmail.com wrote:
> Alternatively one can tilt the stock rather than the head which I
> believe is Gene's plan.
> 
That much stock tilt (30 degrees) in a 21" workpieces length, is well 
beyond the z travel available on that gantry mill, not to mention it 
makes the g-code at least 2x more complex. As is, the deformation of the 
maple as I cut it to make the 2x2 blanks, may need a lincurve to correct 
the Z axis in case it warps as I cut it, but that would be almost on a 
per stick basis. Shudder... However that may be forced on me if this kiln 
dried maple does warp. A bit of warp can be tolerated by the nuts as they 
only engage 2" of the screw, and correcting for that would be preferable 
to running out of wood to make the thread. That would take a lincurve in 
the z, referenceing the mod[b position) plus a linurve to drive a z scale 
driven by the y position. At least 4 more modules in the z path to apply 
it all. The cpu has the cajones to do it, do I have the time and paience 
to calibrate it? That IS the question. :o)

This maple looks good, but I've not yet engaged it with a sawblade. Have 
made a couple gunstocks for a BP rifle, I know better than to expect it 
not to warp unless its been vacuum dried for at least a year. Under a 29 
inch + vacuum. Zero moisture IOW, and this new stuff is likely no dryer 
than 14%. I'll find out quick enough. Like the saw kerf 6" into the first 
cut.

Thanks Ken, you made me think outside the box, and thats always 
appreciated.

Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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Re: [Emc-users] need gcode maker

[gene heskett]

On Sunday, February 13, 2022 12:25:48 PM EST Robin Szemeti via Emc-users 
wrote:
> If you can tilt the head at an angle, then something as simple as "G1
> X300.00 B30.00" will do it, depending on how you have configured the B
> axis.  If you can't  tilt the head, no amount of GCODE will help you.
> 
> I'd just do it on the lathe ...
> 
I've considered that too by making a tool holder to grab a die grinder or 
router. But that would need an er20 collet on my chicago grinder with 
isn't made, so I'd have to find a 60 degree 1/4" tool. Which seems only 
to be made in SC at 11x the cost of a ten pack of steel ones. This is not 
ammenable IMO to using a follower rest unless its movable by the gcode so 
the powered cutter seems to be the only way on a lathe.

The biggest problem on the 6040 is getting the B and its tailstock 
aligned to adequate accuracy, the extension tables are just time to make 
once a jig has been made to drill the mounting bolts where they go on 
each end. Spacing the height a few thou above the bed and the x position 
is I think just a matter of mirroring xy by a sign change in Openscad.

I want to use my newly driven B axis which now has a 50/1 printed 
harmonic drive plus a 60 tooth on the axle, being turned by a 53 tooth on 
the drive turning it by gt2-3 timing belt drive, to turn the screw blank.

>From preliminary measurements if the B drive is mounted 50 thou below the 
end of the bed, axis aligned by the end of the bed, ditto for its 
tailstock, I can handle a 20 to 21" blank. Turn 4 or so 2x2's round with 
an 1/8 mill, install the wedge and a 60 degree tool, and a 2 loop, 70 
line gcode file should cut it.

The first one likely wasted by determining the exact tpmm of the nuts I'm 
printing right now, a 2 start so the half nuts are identical, at about 
12mm per turn.

The problem is that openscad is dimensionless, and cura assumes mm, which 
is pretty close but probably will not properly distribute the force 
against the load side of the teeth, breaking the high load teeth first. 

It will be hundreds a times faster to modify the gcode than to make new 
nuts, it takes openscad about 10 minutes to render the nut to .stl, and 
my BIQU-HX 18 hours to print it. 2 each=about 35 hours if I'm there to 
start the 2nd when the first is done by repeating the already generated 
gcode.

But I might be checking my eyelids for leaks.

That H2 printhead is amazing once the flow rate is adjusted down about 
6%, using a .12mm layer and a .4mm nozzle. Prusa lipstick red PETG, 250C 
nozzle, 80C bed. Downright "purty". And it Just Works.

Take care & stay well everyone.

Cheers, Gene Heskett.
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 





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Re: [Emc-users] need gcode maker

[Ralph Stirling]

Freecad "path" workbench generates g-code toolpaths.  You can paste your 
openscad source code into freecad with the openscad workbench.

-- Ralph

On Feb 13, 2022 8:54 AM, gene heskett  wrote:
CAUTION: This email originated from outside the Walla Walla University email 
system.


Greetings all;

I have composed a simple butress thread in OpenSCAD, which can save many
formats besides the .stl's I feed cura with. Those choices are shown in
this list:
STL
OFF
WRL
AMF
3MF
DXF
SVG
CSG
PDF
image (png)

The latter being what you see in the attached png images.

What is out there that can make gcode out of one of those formats,
assuming I can do some creative editing to make the bolt code carve an
18" bolt from a hard maple 2x2 being spun by a B axis as Y slowly
advances with aux tables to make the Y axis long enough on both ends on
my 6040 mill, and I till use a 60 degree engraving mill in it with a 30
degree wedge under the motor mount to tip it to make the 0 degree load
face of the thread with the side of the tool's V. I intend to make the
wedge as a hinge if I can print it rigid enough. And PETG seems like it
could be the Right Stuff.

The target of all this tom-foolery is a wood workbench vise screw. The
2nd half nut is about half done on my BIQU HX printer as I send this. So
its beginning to look do-able.

I faintly recall that inkscape had a gcode generator plugin at one time,
does anyone have a clue how well it works or if it even exists today?

Synaptic does not look promising but I installed inscape and friends
anyway, and of coarse pycam, and I just found dxf2gcode, so that got
installed.

Does anyone else have a better idea?

Thanks All;
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page 


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Re: [Emc-users] need gcode maker

[ken.strauss]

Thread milling would be a good approach except that I doubt that Gene has 
18-inches of Z-clearance on his small mill to thread the length of his desired 
screw plus spindle clearance to mill to the table might be an issue.

-Original Message-
From: dave engvall  
Sent: February 13, 2022 1:20 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] need gcode maker

Other options for buttress. DIN |  ANSI .. Either grind a tool out of M2 or 
equivalent or go shopping for inserts on the web surplus sites. They won't be 
cheap but a bit less hassle.
Single point thread mill??
Lathe sound easier than milling it.

Dave

On 2/13/22 9:37 AM, ken.stra...@gmail.com wrote:
> Alternatively one can tilt the stock rather than the head which I 
> believe is Gene's plan.
>
> -Original Message-
> From: Robin Szemeti via Emc-users 
> Sent: February 13, 2022 12:26 PM
> To: Enhanced Machine Controller (EMC) 
> 
> Cc: Robin Szemeti 
> Subject: Re: [Emc-users] need gcode maker
>
> If you can tilt the head at an angle, then something as simple as "G1
> X300.00 B30.00" will do it, depending on how you have configured the B axis.
> If you can't  tilt the head, no amount of GCODE will help you.
>
> I'd just do it on the lathe ...
>
> On Sun, 13 Feb 2022 at 16:54, gene heskett  wrote:
>
>> Greetings all;
>>
>> I have composed a simple butress thread in OpenSCAD, which can save 
>> many formats besides the .stl's I feed cura with. Those choices are 
>> shown in this list:
>> STL
>> OFF
>> WRL
>> AMF
>> 3MF
>> DXF
>> SVG
>> CSG
>> PDF
>> image (png)
>>
>> The latter being what you see in the attached png images.
>>
>> What is out there that can make gcode out of one of those formats, 
>> assuming I can do some creative editing to make the bolt code carve 
>> an 18" bolt from a hard maple 2x2 being spun by a B axis as Y slowly 
>> advances with aux tables to make the Y axis long enough on both ends 
>> on my 6040 mill, and I till use a 60 degree engraving mill in it with 
>> a 30 degree wedge under the motor mount to tip it to make the 0 
>> degree load face of the thread with the side of the tool's V. I 
>> intend to make the wedge as a hinge if I can print it rigid enough. 
>> And PETG seems like it could be the Right Stuff.
>>
>> The target of all this tom-foolery is a wood workbench vise screw. 
>> The 2nd half nut is about half done on my BIQU HX printer as I send this.
>> So its beginning to look do-able.
>>
>> I faintly recall that inkscape had a gcode generator plugin at one 
>> time, does anyone have a clue how well it works or if it even exists
> today?
>> Synaptic does not look promising but I installed inscape and friends 
>> anyway, and of coarse pycam, and I just found dxf2gcode, so that got 
>> installed.
>>
>> Does anyone else have a better idea?
>>
>> Thanks All;
>> Cheers, Gene Heskett.
>> --
>> "There are four boxes to be used in defense of liberty:
>>   soap, ballot, jury, and ammo. Please use in that order."
>> -Ed Howdershelt (Author, 1940)
>> If we desire respect for the law, we must first make the law respectable.
>>   - Louis D. Brandeis
>> Genes Web page 
>> ___
>> Emc-users mailing list
>> Emc-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/emc-users
>>
> ___
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> https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
>
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Re: [Emc-users] need gcode maker

[Chris Albertson]

First off this is a really simple design.   I think it could be done on a
normal manual lathe with no CNC. Just use the correct thread cutting gears
to drive the carriage.

The trouble is that writing g-code by hand or turning handwhels with no
computer breaks the chain that goes from your design file to the product.
You have to in effect re-design the product.  It is easy in this simple
case but what if the product was something like the housing for a
motorcycle transition?  There is no way on Earth you'd hand-code that.   So
I can see the need to perfect a workflow that connects CAD models to a
4-axis mill that has no air gaps.

So what you are looking for is traditional "CAM" software.  This is the
software that looks at you model and figureout a toolpath. It might do
roughy cuts first then change the tool and do more.  The software has to
figure this out based on using only the tool you already have and it needs
to know about you mill so it can get the spindle speeds and cut rates
right.  It is not simple.  It is so non-simple that there is not much open
source software to do this.

If you Google "CAM Software" you get a lot of hits.

This websites lists the top 16 CAM software systems, these that can drive a
CNC mill or lathe
https://www.g2.com/categories/computer-aided-manufacturing?tab=highest_rated

If you are looking from free software, the list is short.  FreeCAD can do
some things but is limited to "mostly flat" 3D and 2.5D milling.

Fusion can generate g-code for laths and do full 5-axis milling It can do a
simulation and can pretty much do anything. but the free version is limited
to 3-axis only with no automatic tool changes.   So you have to set up one
job for each tool.


There is also PyCAM but it is more limited then FreeCAD

I think that is the full list of free software.

On Sun, Feb 13, 2022 at 8:58 AM gene heskett  wrote:

> Greetings all;
>
> I have composed a simple butress thread in OpenSCAD, which can save many
> formats besides the .stl's I feed cura with. Those choices are shown in
> this list:
> STL
> OFF
> WRL
> AMF
> 3MF
> DXF
> SVG
> CSG
> PDF
> image (png)
>
> The latter being what you see in the attached png images.
>
> What is out there that can make gcode out of one of those formats,
> assuming I can do some creative editing to make the bolt code carve an
> 18" bolt from a hard maple 2x2 being spun by a B axis as Y slowly
> advances with aux tables to make the Y axis long enough on both ends on
> my 6040 mill, and I till use a 60 degree engraving mill in it with a 30
> degree wedge under the motor mount to tip it to make the 0 degree load
> face of the thread with the side of the tool's V. I intend to make the
> wedge as a hinge if I can print it rigid enough. And PETG seems like it
> could be the Right Stuff.
>
> The target of all this tom-foolery is a wood workbench vise screw. The
> 2nd half nut is about half done on my BIQU HX printer as I send this. So
> its beginning to look do-able.
>
> I faintly recall that inkscape had a gcode generator plugin at one time,
> does anyone have a clue how well it works or if it even exists today?
>
> Synaptic does not look promising but I installed inscape and friends
> anyway, and of coarse pycam, and I just found dxf2gcode, so that got
> installed.
>
> Does anyone else have a better idea?
>
> Thanks All;
> Cheers, Gene Heskett.
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author, 1940)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>


-- 

Chris Albertson
Redondo Beach, California

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Re: [Emc-users] need gcode maker

[dave engvall]

Other options for buttress. DIN |  ANSI .. Either grind a tool out of M2 
or equivalent or go shopping for inserts on the web surplus sites. They 
won't be cheap but a bit less hassle.

Single point thread mill??
Lathe sound easier than milling it.

Dave

On 2/13/22 9:37 AM, ken.stra...@gmail.com wrote:

Alternatively one can tilt the stock rather than the head which I believe is
Gene's plan.

-Original Message-
From: Robin Szemeti via Emc-users 
Sent: February 13, 2022 12:26 PM
To: Enhanced Machine Controller (EMC) 
Cc: Robin Szemeti 
Subject: Re: [Emc-users] need gcode maker

If you can tilt the head at an angle, then something as simple as "G1
X300.00 B30.00" will do it, depending on how you have configured the B axis.
If you can't  tilt the head, no amount of GCODE will help you.

I'd just do it on the lathe ...

On Sun, 13 Feb 2022 at 16:54, gene heskett  wrote:


Greetings all;

I have composed a simple butress thread in OpenSCAD, which can save
many formats besides the .stl's I feed cura with. Those choices are
shown in this list:
STL
OFF
WRL
AMF
3MF
DXF
SVG
CSG
PDF
image (png)

The latter being what you see in the attached png images.

What is out there that can make gcode out of one of those formats,
assuming I can do some creative editing to make the bolt code carve an
18" bolt from a hard maple 2x2 being spun by a B axis as Y slowly
advances with aux tables to make the Y axis long enough on both ends
on my 6040 mill, and I till use a 60 degree engraving mill in it with
a 30 degree wedge under the motor mount to tip it to make the 0 degree
load face of the thread with the side of the tool's V. I intend to
make the wedge as a hinge if I can print it rigid enough. And PETG
seems like it could be the Right Stuff.

The target of all this tom-foolery is a wood workbench vise screw. The
2nd half nut is about half done on my BIQU HX printer as I send this.
So its beginning to look do-able.

I faintly recall that inkscape had a gcode generator plugin at one
time, does anyone have a clue how well it works or if it even exists

today?

Synaptic does not look promising but I installed inscape and friends
anyway, and of coarse pycam, and I just found dxf2gcode, so that got
installed.

Does anyone else have a better idea?

Thanks All;
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
  soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
  - Louis D. Brandeis
Genes Web page 
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Re: [Emc-users] need gcode maker

[ken.strauss]

Alternatively one can tilt the stock rather than the head which I believe is
Gene's plan.

-Original Message-
From: Robin Szemeti via Emc-users  
Sent: February 13, 2022 12:26 PM
To: Enhanced Machine Controller (EMC) 
Cc: Robin Szemeti 
Subject: Re: [Emc-users] need gcode maker

If you can tilt the head at an angle, then something as simple as "G1
X300.00 B30.00" will do it, depending on how you have configured the B axis.
If you can't  tilt the head, no amount of GCODE will help you.

I'd just do it on the lathe ...

On Sun, 13 Feb 2022 at 16:54, gene heskett  wrote:

> Greetings all;
>
> I have composed a simple butress thread in OpenSCAD, which can save 
> many formats besides the .stl's I feed cura with. Those choices are 
> shown in this list:
> STL
> OFF
> WRL
> AMF
> 3MF
> DXF
> SVG
> CSG
> PDF
> image (png)
>
> The latter being what you see in the attached png images.
>
> What is out there that can make gcode out of one of those formats, 
> assuming I can do some creative editing to make the bolt code carve an 
> 18" bolt from a hard maple 2x2 being spun by a B axis as Y slowly 
> advances with aux tables to make the Y axis long enough on both ends 
> on my 6040 mill, and I till use a 60 degree engraving mill in it with 
> a 30 degree wedge under the motor mount to tip it to make the 0 degree 
> load face of the thread with the side of the tool's V. I intend to 
> make the wedge as a hinge if I can print it rigid enough. And PETG 
> seems like it could be the Right Stuff.
>
> The target of all this tom-foolery is a wood workbench vise screw. The 
> 2nd half nut is about half done on my BIQU HX printer as I send this. 
> So its beginning to look do-able.
>
> I faintly recall that inkscape had a gcode generator plugin at one 
> time, does anyone have a clue how well it works or if it even exists
today?
>
> Synaptic does not look promising but I installed inscape and friends 
> anyway, and of coarse pycam, and I just found dxf2gcode, so that got 
> installed.
>
> Does anyone else have a better idea?
>
> Thanks All;
> Cheers, Gene Heskett.
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author, 1940)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>

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Re: [Emc-users] need gcode maker

[Robin Szemeti via Emc-users]

If you can tilt the head at an angle, then something as simple as "G1
X300.00 B30.00" will do it, depending on how you have configured the B
axis.  If you can't  tilt the head, no amount of GCODE will help you.

I'd just do it on the lathe ...

On Sun, 13 Feb 2022 at 16:54, gene heskett  wrote:

> Greetings all;
>
> I have composed a simple butress thread in OpenSCAD, which can save many
> formats besides the .stl's I feed cura with. Those choices are shown in
> this list:
> STL
> OFF
> WRL
> AMF
> 3MF
> DXF
> SVG
> CSG
> PDF
> image (png)
>
> The latter being what you see in the attached png images.
>
> What is out there that can make gcode out of one of those formats,
> assuming I can do some creative editing to make the bolt code carve an
> 18" bolt from a hard maple 2x2 being spun by a B axis as Y slowly
> advances with aux tables to make the Y axis long enough on both ends on
> my 6040 mill, and I till use a 60 degree engraving mill in it with a 30
> degree wedge under the motor mount to tip it to make the 0 degree load
> face of the thread with the side of the tool's V. I intend to make the
> wedge as a hinge if I can print it rigid enough. And PETG seems like it
> could be the Right Stuff.
>
> The target of all this tom-foolery is a wood workbench vise screw. The
> 2nd half nut is about half done on my BIQU HX printer as I send this. So
> its beginning to look do-able.
>
> I faintly recall that inkscape had a gcode generator plugin at one time,
> does anyone have a clue how well it works or if it even exists today?
>
> Synaptic does not look promising but I installed inscape and friends
> anyway, and of coarse pycam, and I just found dxf2gcode, so that got
> installed.
>
> Does anyone else have a better idea?
>
> Thanks All;
> Cheers, Gene Heskett.
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author, 1940)
> If we desire respect for the law, we must first make the law respectable.
>  - Louis D. Brandeis
> Genes Web page 
> ___
> Emc-users mailing list
> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users
>

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