Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-18 Thread Andy Evans 
Gene, have you ever looked into

http://www.harveytool.com/

My go-to for those types of cutters.  Also, have you considered 
contouring your outside radius with a ball cutter and small stepovers?

Andy Evans
Evans Precision Tooling Incorporated

On 10/18/2015 1:06 AM, emc-users-requ...@lists.sourceforge.net wrote:
> And it turns out when googling, that part number is a 1/16" radius bit,
> no damned wonder its not  doing the job!  Amazon miss-described it.
> Thats twice they've bit my ass in the last month.
>
> And the only hit I can get on a 1/8" radius pointed round over is at
> Carbide Processors, at $108 a copy that is un-obtainium personified!
>
> Does anyone else have better google foo than that?
>
> I have some diamond burrs for a dremel. I might be able to make these 3
> $13 versions into a more pleasing profile on the toy mill.


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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Jon Elson 
On 10/17/2015 09:47 PM, Gene Heskett wrote:
> So I went to Shop & Save & got the only re-usable mouse 
> traps they had, the other choices being sticky pads or 
> DeCon. Made out of thin galvanized steel these days, a 
> very very poor design. I've been bending parts around to 
> make them more sensitive, but so far all I am doing is 
> furnishing a 2 location daily buffet of peanut butter,
Plain peanut butter doesn't work.  What you need is chunky.  
The peanut butter smell attracts them, but you have to embed 
a chuck of peanut in the claw of the Victor traps with the 
metal trip part. When they try to dig that chunk of peanut 
out, then the trap will trip.  When I detect mice around, I 
freshly bait the traps, and usually hear a snap within 20 
minutes.

Jon

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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Todd Zuercher 
Gene,

The Carbideprocessors product description doesn't appear to be 100% correct.  
That is why I included the link to Southeast Tools catalog.

- Original Message -
From: "Todd Zuercher" <zuerc...@embarqmail.com>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Sent: Saturday, October 17, 2015 11:53:57 PM
Subject: Re: [Emc-users] using tool table offsets with G41 or 42

We have some 1/8" radius pointed roundover bits at work that weren't real 
expensive.  I can look up the manufacturer and part number Monday.  Southeast 
Tools (China knock-offs of White side tools) part# SE1568. 
http://www.southeasttool.com/catalog/index.html#p=26
http://www.carbideprocessors.com/point-cutting-roundover-bit-3-4-dia-3-8-cut-length-1-4-shank-southeast-tool-se1568/

- Original Message -
From: "Gene Heskett" <ghesk...@wdtv.com>
To: emc-users@lists.sourceforge.net
Sent: Saturday, October 17, 2015 11:26:33 PM
Subject: Re: [Emc-users] using tool table offsets with G41 or 42

On Saturday 17 October 2015 22:47:43 Gene Heskett wrote:

> On Saturday 17 October 2015 00:21:32 Gene Heskett wrote:
>
> [...]
>
> > If tool compensation can really be made to work, it would simplicate
> > at least 100 LOC out of this program.  Already has, but I'm now
> > adding more stuff to make sure there is turn around room at the ends
> > of the cut sweeps.  But tomorrow is another day.  I am pleased with
> > todays progress.
>
> This was that tommorrow.  I kept getting closer & closer, but I've
> come to 3 conclusions.
>
> 1. I need a roundover tool with a slightly larger radii, these are
> 1/8", bought because the 1/4" tool leaves a 1/8" radius cut at an
> inside corner, and I need perhaps a  5/32 or even a 3/16, but those
> seem to be made of pure unobtainium.

And it turns out when googling, that part number is a 1/16" radius bit, 
no damned wonder its not  doing the job!  Amazon miss-described it.  
Thats twice they've bit my ass in the last month.

And the only hit I can get on a 1/8" radius pointed round over is at 
Carbide Processors, at $108 a copy that is un-obtainium personified!

Does anyone else have better google foo than that?

I have some diamond burrs for a dremel. I might be able to make these 3 
$13 versions into a more pleasing profile on the toy mill.

> 2. This tool, at 2500 revs, if it does have a sharp point, needs to be
> fed quite a bit slower than 20 IPM, the tip is just rolling on the
> wood, leaving a line of whiskers to clean off.  So tommorrow I'll add
> a roundover feed rate thats about 1/8th the 1/4" tools 20 ipm feed
> rate to see if that will result in a cleaner cut.
>
> 3. I need to add a radius move at the inner end of the fingers
> pockets, a bit over and above what the tool comp does, its squaring up
> that inside corner too much.  That isn't hurting anything but it does
> look funkity when the joints are brought together.  And THAT will be
> fun, NOT.
>
> 4. I had a mouse run into the garage a couple days ago while I was
> doing some house cleaning & trash bagging.  So I went to Shop & Save &
> got the only re-usable mouse traps they had, the other choices being
> sticky pads or DeCon.  Made out of thin galvanized steel these days, a
> very very poor design.  I've been bending parts around to make them
> more sensitive, but so far all I am doing is furnishing a 2 location
> daily buffet of peanut butter, which its repeatedly cleaning off the
> trip pans because they are so damned hard to trip. The basic problem
> is that the wire holding the spring loaded bail open, has its anchor
> point about 3x farther away from the bail wire than the old style
> wooden trap, so the leverage it puts on the trip wire is sufficient to
> actually lift the pan back into position as long as its not standing
> on the pan with all 4 feet.
>
> I take it they were designed to be a buffet table by the humane
> society, not to kill mice. :(
>
> Cheers, Gene Heskett


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)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Gene Heskett 
On Saturday 17 October 2015 22:47:43 Gene Heskett wrote:

> On Saturday 17 October 2015 00:21:32 Gene Heskett wrote:
>
> [...]
>
> > If tool compensation can really be made to work, it would simplicate
> > at least 100 LOC out of this program.  Already has, but I'm now
> > adding more stuff to make sure there is turn around room at the ends
> > of the cut sweeps.  But tomorrow is another day.  I am pleased with
> > todays progress.
>
> This was that tommorrow.  I kept getting closer & closer, but I've
> come to 3 conclusions.
>
> 1. I need a roundover tool with a slightly larger radii, these are
> 1/8", bought because the 1/4" tool leaves a 1/8" radius cut at an
> inside corner, and I need perhaps a  5/32 or even a 3/16, but those
> seem to be made of pure unobtainium.

And it turns out when googling, that part number is a 1/16" radius bit, 
no damned wonder its not  doing the job!  Amazon miss-described it.  
Thats twice they've bit my ass in the last month.

And the only hit I can get on a 1/8" radius pointed round over is at 
Carbide Processors, at $108 a copy that is un-obtainium personified!

Does anyone else have better google foo than that?

I have some diamond burrs for a dremel. I might be able to make these 3 
$13 versions into a more pleasing profile on the toy mill.

> 2. This tool, at 2500 revs, if it does have a sharp point, needs to be
> fed quite a bit slower than 20 IPM, the tip is just rolling on the
> wood, leaving a line of whiskers to clean off.  So tommorrow I'll add
> a roundover feed rate thats about 1/8th the 1/4" tools 20 ipm feed
> rate to see if that will result in a cleaner cut.
>
> 3. I need to add a radius move at the inner end of the fingers
> pockets, a bit over and above what the tool comp does, its squaring up
> that inside corner too much.  That isn't hurting anything but it does
> look funkity when the joints are brought together.  And THAT will be
> fun, NOT.
>
> 4. I had a mouse run into the garage a couple days ago while I was
> doing some house cleaning & trash bagging.  So I went to Shop & Save &
> got the only re-usable mouse traps they had, the other choices being
> sticky pads or DeCon.  Made out of thin galvanized steel these days, a
> very very poor design.  I've been bending parts around to make them
> more sensitive, but so far all I am doing is furnishing a 2 location
> daily buffet of peanut butter, which its repeatedly cleaning off the
> trip pans because they are so damned hard to trip. The basic problem
> is that the wire holding the spring loaded bail open, has its anchor
> point about 3x farther away from the bail wire than the old style
> wooden trap, so the leverage it puts on the trip wire is sufficient to
> actually lift the pan back into position as long as its not standing
> on the pan with all 4 feet.
>
> I take it they were designed to be a buffet table by the humane
> society, not to kill mice. :(
>
> Cheers, Gene Heskett


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)
Genes Web page 

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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Todd Zuercher 

Ahh, the "better" mouse trap.  You can still get the old fashioned wooden ones. 
 (pretty sure Dollar General usually has them).  I like some of the newer 
wooden ones that have the plastic trigger pad.  They are very sensitive 
sometimes almost too sensitive. (go off when you set them down.)

- Original Message -
From: "Gene Heskett" <ghesk...@wdtv.com>
To: emc-users@lists.sourceforge.net
Sent: Saturday, October 17, 2015 10:47:43 PM
Subject: Re: [Emc-users] using tool table offsets with G41 or 42

On Saturday 17 October 2015 00:21:32 Gene Heskett wrote:

[...]

> If tool compensation can really be made to work, it would simplicate
> at least 100 LOC out of this program.  Already has, but I'm now adding
> more stuff to make sure there is turn around room at the ends of the
> cut sweeps.  But tomorrow is another day.  I am pleased with todays
> progress.

This was that tommorrow.  I kept getting closer & closer, but I've come 
to 3 conclusions.

1. I need a roundover tool with a slightly larger radii, these are 1/8", 
bought because the 1/4" tool leaves a 1/8" radius cut at an inside 
corner, and I need perhaps a  5/32 or even a 3/16, but those seem to be 
made of pure unobtainium.

2. This tool, at 2500 revs, if it does have a sharp point, needs to be 
fed quite a bit slower than 20 IPM, the tip is just rolling on the wood, 
leaving a line of whiskers to clean off.  So tommorrow I'll add a 
roundover feed rate thats about 1/8th the 1/4" tools 20 ipm feed rate to 
see if that will result in a cleaner cut.

3. I need to add a radius move at the inner end of the fingers pockets, a 
bit over and above what the tool comp does, its squaring up that inside 
corner too much.  That isn't hurting anything but it does look funkity 
when the joints are brought together.  And THAT will be fun, NOT.

4. I had a mouse run into the garage a couple days ago while I was doing 
some house cleaning & trash bagging.  So I went to Shop & Save & got the 
only re-usable mouse traps they had, the other choices being sticky pads 
or DeCon.  Made out of thin galvanized steel these days, a very very 
poor design.  I've been bending parts around to make them more 
sensitive, but so far all I am doing is furnishing a 2 location daily  
buffet of peanut butter, which its repeatedly cleaning off the trip pans 
because they are so damned hard to trip. The basic problem is that the 
wire holding the spring loaded bail open, has its anchor point about 3x 
farther away from the bail wire than the old style wooden trap, so the 
leverage it puts on the trip wire is sufficient to actually lift the pan 
back into position as long as its not standing on the pan with all 4 
feet.

I take it they were designed to be a buffet table by the humane society, 
not to kill mice. :(

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)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Gene Heskett 
On Saturday 17 October 2015 00:21:32 Gene Heskett wrote:

[...]

> If tool compensation can really be made to work, it would simplicate
> at least 100 LOC out of this program.  Already has, but I'm now adding
> more stuff to make sure there is turn around room at the ends of the
> cut sweeps.  But tomorrow is another day.  I am pleased with todays
> progress.

This was that tommorrow.  I kept getting closer & closer, but I've come 
to 3 conclusions.

1. I need a roundover tool with a slightly larger radii, these are 1/8", 
bought because the 1/4" tool leaves a 1/8" radius cut at an inside 
corner, and I need perhaps a  5/32 or even a 3/16, but those seem to be 
made of pure unobtainium.

2. This tool, at 2500 revs, if it does have a sharp point, needs to be 
fed quite a bit slower than 20 IPM, the tip is just rolling on the wood, 
leaving a line of whiskers to clean off.  So tommorrow I'll add a 
roundover feed rate thats about 1/8th the 1/4" tools 20 ipm feed rate to 
see if that will result in a cleaner cut.

3. I need to add a radius move at the inner end of the fingers pockets, a 
bit over and above what the tool comp does, its squaring up that inside 
corner too much.  That isn't hurting anything but it does look funkity 
when the joints are brought together.  And THAT will be fun, NOT.

4. I had a mouse run into the garage a couple days ago while I was doing 
some house cleaning & trash bagging.  So I went to Shop & Save & got the 
only re-usable mouse traps they had, the other choices being sticky pads 
or DeCon.  Made out of thin galvanized steel these days, a very very 
poor design.  I've been bending parts around to make them more 
sensitive, but so far all I am doing is furnishing a 2 location daily  
buffet of peanut butter, which its repeatedly cleaning off the trip pans 
because they are so damned hard to trip. The basic problem is that the 
wire holding the spring loaded bail open, has its anchor point about 3x 
farther away from the bail wire than the old style wooden trap, so the 
leverage it puts on the trip wire is sufficient to actually lift the pan 
back into position as long as its not standing on the pan with all 4 
feet.

I take it they were designed to be a buffet table by the humane society, 
not to kill mice. :(

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)
Genes Web page 

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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Todd Zuercher 
We have some 1/8" radius pointed roundover bits at work that weren't real 
expensive.  I can look up the manufacturer and part number Monday.  Southeast 
Tools (China knock-offs of White side tools) part# SE1568. 
http://www.southeasttool.com/catalog/index.html#p=26
http://www.carbideprocessors.com/point-cutting-roundover-bit-3-4-dia-3-8-cut-length-1-4-shank-southeast-tool-se1568/

- Original Message -
From: "Gene Heskett" <ghesk...@wdtv.com>
To: emc-users@lists.sourceforge.net
Sent: Saturday, October 17, 2015 11:26:33 PM
Subject: Re: [Emc-users] using tool table offsets with G41 or 42

On Saturday 17 October 2015 22:47:43 Gene Heskett wrote:

> On Saturday 17 October 2015 00:21:32 Gene Heskett wrote:
>
> [...]
>
> > If tool compensation can really be made to work, it would simplicate
> > at least 100 LOC out of this program.  Already has, but I'm now
> > adding more stuff to make sure there is turn around room at the ends
> > of the cut sweeps.  But tomorrow is another day.  I am pleased with
> > todays progress.
>
> This was that tommorrow.  I kept getting closer & closer, but I've
> come to 3 conclusions.
>
> 1. I need a roundover tool with a slightly larger radii, these are
> 1/8", bought because the 1/4" tool leaves a 1/8" radius cut at an
> inside corner, and I need perhaps a  5/32 or even a 3/16, but those
> seem to be made of pure unobtainium.

And it turns out when googling, that part number is a 1/16" radius bit, 
no damned wonder its not  doing the job!  Amazon miss-described it.  
Thats twice they've bit my ass in the last month.

And the only hit I can get on a 1/8" radius pointed round over is at 
Carbide Processors, at $108 a copy that is un-obtainium personified!

Does anyone else have better google foo than that?

I have some diamond burrs for a dremel. I might be able to make these 3 
$13 versions into a more pleasing profile on the toy mill.

> 2. This tool, at 2500 revs, if it does have a sharp point, needs to be
> fed quite a bit slower than 20 IPM, the tip is just rolling on the
> wood, leaving a line of whiskers to clean off.  So tommorrow I'll add
> a roundover feed rate thats about 1/8th the 1/4" tools 20 ipm feed
> rate to see if that will result in a cleaner cut.
>
> 3. I need to add a radius move at the inner end of the fingers
> pockets, a bit over and above what the tool comp does, its squaring up
> that inside corner too much.  That isn't hurting anything but it does
> look funkity when the joints are brought together.  And THAT will be
> fun, NOT.
>
> 4. I had a mouse run into the garage a couple days ago while I was
> doing some house cleaning & trash bagging.  So I went to Shop & Save &
> got the only re-usable mouse traps they had, the other choices being
> sticky pads or DeCon.  Made out of thin galvanized steel these days, a
> very very poor design.  I've been bending parts around to make them
> more sensitive, but so far all I am doing is furnishing a 2 location
> daily buffet of peanut butter, which its repeatedly cleaning off the
> trip pans because they are so damned hard to trip. The basic problem
> is that the wire holding the spring loaded bail open, has its anchor
> point about 3x farther away from the bail wire than the old style
> wooden trap, so the leverage it puts on the trip wire is sufficient to
> actually lift the pan back into position as long as its not standing
> on the pan with all 4 feet.
>
> I take it they were designed to be a buffet table by the humane
> society, not to kill mice. :(
>
> Cheers, Gene Heskett


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)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Gene Heskett 
On Saturday 17 October 2015 23:21:56 Todd Zuercher wrote:

> Ahh, the "better" mouse trap.  You can still get the old fashioned
> wooden ones.  (pretty sure Dollar General usually has them).  I like
> some of the newer wooden ones that have the plastic trigger pad.  They
> are very sensitive sometimes almost too sensitive. (go off when you
> set them down.)

I hadn't considered the dollar store.  We've a couple of those, out in 
the very low rent districts.  Thanks for the reminder.

> - Original Message -
> From: "Gene Heskett" <ghesk...@wdtv.com>
> To: emc-users@lists.sourceforge.net
> Sent: Saturday, October 17, 2015 10:47:43 PM
> Subject: Re: [Emc-users] using tool table offsets with G41 or 42
>
> On Saturday 17 October 2015 00:21:32 Gene Heskett wrote:
>
> [...]
>
> > If tool compensation can really be made to work, it would simplicate
> > at least 100 LOC out of this program.  Already has, but I'm now
> > adding more stuff to make sure there is turn around room at the ends
> > of the cut sweeps.  But tomorrow is another day.  I am pleased with
> > todays progress.
>
> This was that tommorrow.  I kept getting closer & closer, but I've
> come to 3 conclusions.
>
> 1. I need a roundover tool with a slightly larger radii, these are
> 1/8", bought because the 1/4" tool leaves a 1/8" radius cut at an
> inside corner, and I need perhaps a  5/32 or even a 3/16, but those
> seem to be made of pure unobtainium.
>
> 2. This tool, at 2500 revs, if it does have a sharp point, needs to be
> fed quite a bit slower than 20 IPM, the tip is just rolling on the
> wood, leaving a line of whiskers to clean off.  So tommorrow I'll add
> a roundover feed rate thats about 1/8th the 1/4" tools 20 ipm feed
> rate to see if that will result in a cleaner cut.
>
> 3. I need to add a radius move at the inner end of the fingers
> pockets, a bit over and above what the tool comp does, its squaring up
> that inside corner too much.  That isn't hurting anything but it does
> look funkity when the joints are brought together.  And THAT will be
> fun, NOT.
>
> 4. I had a mouse run into the garage a couple days ago while I was
> doing some house cleaning & trash bagging.  So I went to Shop & Save &
> got the only re-usable mouse traps they had, the other choices being
> sticky pads or DeCon.  Made out of thin galvanized steel these days, a
> very very poor design.  I've been bending parts around to make them
> more sensitive, but so far all I am doing is furnishing a 2 location
> daily buffet of peanut butter, which its repeatedly cleaning off the
> trip pans because they are so damned hard to trip. The basic problem
> is that the wire holding the spring loaded bail open, has its anchor
> point about 3x farther away from the bail wire than the old style
> wooden trap, so the leverage it puts on the trip wire is sufficient to
> actually lift the pan back into position as long as its not standing
> on the pan with all 4 feet.
>
> I take it they were designed to be a buffet table by the humane
> society, not to kill mice. :(
>
> Cheers, Gene Heskett


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)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Gene Heskett 
On Saturday 17 October 2015 23:17:40 Jon Elson wrote:

> On 10/17/2015 09:47 PM, Gene Heskett wrote:
> > So I went to Shop & Save & got the only re-usable mouse
> > traps they had, the other choices being sticky pads or
> > DeCon. Made out of thin galvanized steel these days, a
> > very very poor design. I've been bending parts around to
> > make them more sensitive, but so far all I am doing is
> > furnishing a 2 location daily buffet of peanut butter,
>
> Plain peanut butter doesn't work.  What you need is chunky.
> The peanut butter smell attracts them, but you have to embed
> a chuck of peanut in the claw of the Victor traps with the
> metal trip part. When they try to dig that chunk of peanut
> out, then the trap will trip.  When I detect mice around, I
> freshly bait the traps, and usually hear a snap within 20
> minutes.
>
> Jon
>
These aren't victor traps, and it is chunky, but I haven't tried to 
actually trap a hunk under the claw.  If this set fails, I'll stick a 
piece of english walnut under the claw & cover it with chunky PB.

But tonight I need to go dump the plastic rain gauge, its supposedly 
freezing here, but the airport temp 20 miles north is 40F.  Figures.

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)
Genes Web page 

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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Jon Elson 
On 10/16/2015 11:21 PM, Gene Heskett wrote:
> Greetings;
>
> 1: I am trying to get past the infamous, permanently programmed into LCNC
> error of:
>
> "length of cutter compensation entry move is less than the tools radius"
>
> The tool diameter in the tool_table is 0.030 just for test.  and the tool
> table entry contains no TLO, nor am I using an G41 D0, plain old G41.
> The code has a G40 in its preamble.

Here's where this is discussed in the documentation, see 
section 3 at the bottom of the page :

http://www.linuxcnc.org/docs/html/gcode/tool-compensation.html

There's also this :
http://www.gnipsel.com/linuxcnc/g-code/mill04.html

There used to be a page on this that had something from Ray Henry and an 
example by me, but I can't find it, it may have been edited out over the years.


> And the next x or y move after invoking a G41 is several inches away.
> There is also an intervening z move of a few inches, so it has literally
> feet of motion to bring in the compensation.  The first move after its
> invocation is I believe, a z move that could be as little as 50 thou
> depending on where the machine is sitting.  OTOH it could be more than
> 7" in Z, and 18 in x, or 3" in y while its still up in the air above the
> workpiece.
What you need is a slightly convex edge for the lead-in.  In 
other words, an OUTSIDE corner.
If there is an inside corner, no matter how shallow, it will 
cause a gouge message.  Now, the specific message seems to 
be confusing.  Z moves don't count for G41/G42, ONLY X-Y 
axis moves, because the radius of the cutter only exists in 
the X-Y plane.
> 2: In the manual, it speaks of left and right compensation, and I am
> having a hard time wrapping my head around the corelation of that
> language to "climb" or "dig" cutting.
If you were walking behind the cutter, is the cutter to the 
left or right of the material?  That's what cutter to left 
of material means.  So, I guess with standard cutters that 
run CW looking down on the work, and climb-cutting, then the 
cutter is left of the work.

Jon


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Re: [Emc-users] using tool table offsets with G41 or 42

2015-10-17 Thread Jason Burton 
Hi Gene,

Think of cutter comp like American and British roads.

G41 is Brit. G42 is Yank.

Climb vs conventional depend on whether the road goes around the outside of
the stadium or around the inside.

Best,
Jason
On Oct 16, 2015 11:25 PM, "Gene Heskett"  wrote:

> Greetings;
>
> 1: I am trying to get past the infamous, permanently programmed into LCNC
> error of:
>
> "length of cutter compensation entry move is less than the tools radius"
>
> The tool diameter in the tool_table is 0.030 just for test.  and the tool
> table entry contains no TLO, nor am I using an G41 D0, plain old G41.
> The code has a G40 in its preamble.
>
> And the next x or y move after invoking a G41 is several inches away.
> There is also an intervening z move of a few inches, so it has literally
> feet of motion to bring in the compensation.  The first move after its
> invocation is I believe, a z move that could be as little as 50 thou
> depending on where the machine is sitting.  OTOH it could be more than
> 7" in Z, and 18 in x, or 3" in y while its still up in the air above the
> workpiece.
>
> Despite quite a few attempts over the years, I have never actually made
> it work.  Until today, but gouging problems despite my coding in plenty
> of room for a tool direction reversal.
>
> What am I missing?
>
> 2: In the manual, it speaks of left and right compensation, and I am
> having a hard time wrapping my head around the corelation of that
> language to "climb" or "dig" cutting.  As all this wood carving is being
> done in climb direction to reduce any dig splintering, it seems like I'd
> have to issue a few of the opposite flaver to assure it doesn't plow up
> the end of the board on the retrace back to the left edge. That, or pick
> up the tool for move clearance.  In which case having blending on could
> damage the workpiece.  That too is do-able but Y is faster without the
> tool comp move.
>
> And it appears from its behaviour that a G41 is a "climb" cut, while G42
> I assume is a "dig" cut.
>
> So I think have that sorted. But the gouging exits are a problem yet
> because it will not draw the backplot to show one where the gouge is.
> I don't have it when doing the end of a "side" board, but it sticks up
> its ugly red x hand if I turn side off to do the ends of a end board in
> this box.  If side is on, I do see 2 tiny red x's at the left edge of
> the backplot, both would occur well off the workpiece at it approaches
> the starting location of a pass.  Beyond that, I am in the dark.
>
> So my final question is:
>
> Is there a detective method that will show me where it is?
>
> Since LinuxCNC doesn't (yet) follow subroutines, blaming everything wrong
> on the call to the subroutine, do I have to copy/paste a copy of my 2
> corner routines so the first iteration of each is inline before it will
> tell me where the problem is? Since it was the left corner that was the
> majority of the trouble, I did copy/paste it as inline, twice, and was
> able to fix enough of it until I hit the right corner code, which I'll
> have to do the same to, but its getting sleepy out, and way past beer
> thirty so I am still my one a day behind.
>
> If tool compensation can really be made to work, it would simplicate at
> least 100 LOC out of this program.  Already has, but I'm now adding more
> stuff to make sure there is turn around room at the ends of the cut
> sweeps.  But tomorrow is another day.  I am pleased with todays
> progress.
>
> Comments?
>
> Thanks.
>
> 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)
> Genes Web page 
>
>
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[Emc-users] using tool table offsets with G41 or 42

2015-10-16 Thread Gene Heskett 
Greetings;

1: I am trying to get past the infamous, permanently programmed into LCNC 
error of:

"length of cutter compensation entry move is less than the tools radius"

The tool diameter in the tool_table is 0.030 just for test.  and the tool 
table entry contains no TLO, nor am I using an G41 D0, plain old G41.  
The code has a G40 in its preamble.

And the next x or y move after invoking a G41 is several inches away.
There is also an intervening z move of a few inches, so it has literally 
feet of motion to bring in the compensation.  The first move after its 
invocation is I believe, a z move that could be as little as 50 thou 
depending on where the machine is sitting.  OTOH it could be more than 
7" in Z, and 18 in x, or 3" in y while its still up in the air above the 
workpiece.

Despite quite a few attempts over the years, I have never actually made 
it work.  Until today, but gouging problems despite my coding in plenty 
of room for a tool direction reversal.

What am I missing?  

2: In the manual, it speaks of left and right compensation, and I am 
having a hard time wrapping my head around the corelation of that 
language to "climb" or "dig" cutting.  As all this wood carving is being 
done in climb direction to reduce any dig splintering, it seems like I'd 
have to issue a few of the opposite flaver to assure it doesn't plow up 
the end of the board on the retrace back to the left edge. That, or pick 
up the tool for move clearance.  In which case having blending on could 
damage the workpiece.  That too is do-able but Y is faster without the 
tool comp move.

And it appears from its behaviour that a G41 is a "climb" cut, while G42 
I assume is a "dig" cut.

So I think have that sorted. But the gouging exits are a problem yet 
because it will not draw the backplot to show one where the gouge is.
I don't have it when doing the end of a "side" board, but it sticks up 
its ugly red x hand if I turn side off to do the ends of a end board in 
this box.  If side is on, I do see 2 tiny red x's at the left edge of 
the backplot, both would occur well off the workpiece at it approaches 
the starting location of a pass.  Beyond that, I am in the dark.

So my final question is:

Is there a detective method that will show me where it is?

Since LinuxCNC doesn't (yet) follow subroutines, blaming everything wrong 
on the call to the subroutine, do I have to copy/paste a copy of my 2 
corner routines so the first iteration of each is inline before it will 
tell me where the problem is? Since it was the left corner that was the 
majority of the trouble, I did copy/paste it as inline, twice, and was 
able to fix enough of it until I hit the right corner code, which I'll 
have to do the same to, but its getting sleepy out, and way past beer 
thirty so I am still my one a day behind.

If tool compensation can really be made to work, it would simplicate at 
least 100 LOC out of this program.  Already has, but I'm now adding more 
stuff to make sure there is turn around room at the ends of the cut 
sweeps.  But tomorrow is another day.  I am pleased with todays 
progress.

Comments?

Thanks.

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)
Genes Web page 

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