Re: [Emc-users] four axis foam cutter 2.8 config

[Phill Carter]

> On 2 Jul 2021, at 9:03 am, Ralph Stirling  
> wrote:
> 
> Some developer went to the trouble to add the very nice
> FOAM mode to axis, which looks great.  There just seems
> to be some problem with kinematics that won't drive the
> second pair of joints.  I've tried changing to joints 6 and 7
> instead of 2 and 3 for the U and V axes, but that didn't
> work.  There is either missing information in the docs for
> making this work, or a bug, not sure which yet.  I'll keep
> reading source code and experimenting.
> 
> — Ralph

There is a Axis sim that may shed some light:

>

> 
> From: Todd Zuercher [to...@pgrahamdunn.com]
> Sent: Thursday, July 1, 2021 2:08 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] four axis foam cutter 2.8 config
> 
> CAUTION: This email originated from outside the Walla Walla University email 
> system.
> 
> 
> I don't think there are a whole lot of foam cutters out there period.  But 
> with my very limited knowledge of the subject, I would have thought the JA 
> version would be better suited for it.  It is possible that some of the 
> workarounds that had to be done to make the wire cutter work  with the 
> earlier versions are no longer needed and causing problems in your new 
> config.  But I really have no idea, what the problem(s) could be.
> 
> Todd Zuercher
> P. Graham Dunn Inc.
> 630 Henry Street
> Dalton, Ohio 44618
> Phone:  (330)828-2105ext. 2031
> 
> -Original Message-
> From: Ralph Stirling 
> Sent: Thursday, July 01, 2021 3:25 PM
> To: emc-users@lists.sourceforge.net
> Subject: Re: [Emc-users] four axis foam cutter 2.8 config
> 
> [EXTERNAL EMAIL] Be sure links are safe.
> 
> I'm getting the impression that I'm the first one to actually try post-2.7 
> linuxcnc on 4-axis foam cutter hardware.  I've set up 2.9-pre0 from git so I 
> can start poking in the source code.  2.9-pre0 behaves the same way.  I have 
> verified that axis.x.pos-cmd and joint.0.pos-cmd both change as expected, but 
> axis.y.pos-cmd changes while joint.2.pos-cmd does not.  So something is 
> broken in joint-axis code for the XY;UV geometry.
> 
> -- Ralph
> 
> From: Ralph Stirling
> Sent: Wednesday, June 30, 2021 5:20 PM
> To: emc-users@lists.sourceforge.net
> Subject: four axis foam cutter 2.8 config
> 
> I upgraded our 4-axis hotwire foam cutter to 2.8 recently, and have not been 
> able to get it running again yet.  The auto conversion doesn't seem to be 
> quite sufficient for foam cutter configurations.
> 
> I now have homing on all four axes working (XY;UV), but once homing is 
> finished I can't jog U or V.  The backplot shows motion, but the axes don't 
> move.
> X and Y jog properly.  The U and V (and joint 2 and
> 3) sections are copied directly from X/0 and Y/1 with only the axis and joint 
> designation changing.
> 
> Does anybody have a functioning 2.8 foam cutter configuration I could look at?
> 
> Thanks,
> -- Ralph
> 
> 
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Re: [Emc-users] four axis foam cutter 2.8 config

[Ralph Stirling]

Some developer went to the trouble to add the very nice
FOAM mode to axis, which looks great.  There just seems
to be some problem with kinematics that won't drive the
second pair of joints.  I've tried changing to joints 6 and 7
instead of 2 and 3 for the U and V axes, but that didn't
work.  There is either missing information in the docs for
making this work, or a bug, not sure which yet.  I'll keep
reading source code and experimenting.

-- Ralph

From: Todd Zuercher [to...@pgrahamdunn.com]
Sent: Thursday, July 1, 2021 2:08 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] four axis foam cutter 2.8 config

CAUTION: This email originated from outside the Walla Walla University email 
system.


I don't think there are a whole lot of foam cutters out there period.  But with 
my very limited knowledge of the subject, I would have thought the JA version 
would be better suited for it.  It is possible that some of the workarounds 
that had to be done to make the wire cutter work  with the earlier versions are 
no longer needed and causing problems in your new config.  But I really have no 
idea, what the problem(s) could be.

Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031

-Original Message-
From: Ralph Stirling 
Sent: Thursday, July 01, 2021 3:25 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] four axis foam cutter 2.8 config

[EXTERNAL EMAIL] Be sure links are safe.

I'm getting the impression that I'm the first one to actually try post-2.7 
linuxcnc on 4-axis foam cutter hardware.  I've set up 2.9-pre0 from git so I 
can start poking in the source code.  2.9-pre0 behaves the same way.  I have 
verified that axis.x.pos-cmd and joint.0.pos-cmd both change as expected, but 
axis.y.pos-cmd changes while joint.2.pos-cmd does not.  So something is broken 
in joint-axis code for the XY;UV geometry.

-- Ralph

From: Ralph Stirling
Sent: Wednesday, June 30, 2021 5:20 PM
To: emc-users@lists.sourceforge.net
Subject: four axis foam cutter 2.8 config

I upgraded our 4-axis hotwire foam cutter to 2.8 recently, and have not been 
able to get it running again yet.  The auto conversion doesn't seem to be quite 
sufficient for foam cutter configurations.

I now have homing on all four axes working (XY;UV), but once homing is finished 
I can't jog U or V.  The backplot shows motion, but the axes don't move.
X and Y jog properly.  The U and V (and joint 2 and
3) sections are copied directly from X/0 and Y/1 with only the axis and joint 
designation changing.

Does anybody have a functioning 2.8 foam cutter configuration I could look at?

Thanks,
-- Ralph


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Re: [Emc-users] four axis foam cutter 2.8 config

[Todd Zuercher]

I don't think there are a whole lot of foam cutters out there period.  But with 
my very limited knowledge of the subject, I would have thought the JA version 
would be better suited for it.  It is possible that some of the workarounds 
that had to be done to make the wire cutter work  with the earlier versions are 
no longer needed and causing problems in your new config.  But I really have no 
idea, what the problem(s) could be.

Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street 
Dalton, Ohio 44618
Phone:  (330)828-2105ext. 2031

-Original Message-
From: Ralph Stirling  
Sent: Thursday, July 01, 2021 3:25 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] four axis foam cutter 2.8 config

[EXTERNAL EMAIL] Be sure links are safe.

I'm getting the impression that I'm the first one to actually try post-2.7 
linuxcnc on 4-axis foam cutter hardware.  I've set up 2.9-pre0 from git so I 
can start poking in the source code.  2.9-pre0 behaves the same way.  I have 
verified that axis.x.pos-cmd and joint.0.pos-cmd both change as expected, but 
axis.y.pos-cmd changes while joint.2.pos-cmd does not.  So something is broken 
in joint-axis code for the XY;UV geometry.

-- Ralph

From: Ralph Stirling
Sent: Wednesday, June 30, 2021 5:20 PM
To: emc-users@lists.sourceforge.net
Subject: four axis foam cutter 2.8 config

I upgraded our 4-axis hotwire foam cutter to 2.8 recently, and have not been 
able to get it running again yet.  The auto conversion doesn't seem to be quite 
sufficient for foam cutter configurations.

I now have homing on all four axes working (XY;UV), but once homing is finished 
I can't jog U or V.  The backplot shows motion, but the axes don't move.
X and Y jog properly.  The U and V (and joint 2 and
3) sections are copied directly from X/0 and Y/1 with only the axis and joint 
designation changing.

Does anybody have a functioning 2.8 foam cutter configuration I could look at?

Thanks,
-- Ralph


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Re: [Emc-users] four axis foam cutter 2.8 config

[Ralph Stirling]

I'm getting the impression that I'm the first one to
actually try post-2.7 linuxcnc on 4-axis foam
cutter hardware.  I've set up 2.9-pre0 from git so
I can start poking in the source code.  2.9-pre0
behaves the same way.  I have verified that axis.x.pos-cmd
and joint.0.pos-cmd both change as expected, but
axis.y.pos-cmd changes while joint.2.pos-cmd does
not.  So something is broken in joint-axis code for
the XY;UV geometry.

-- Ralph

From: Ralph Stirling
Sent: Wednesday, June 30, 2021 5:20 PM
To: emc-users@lists.sourceforge.net
Subject: four axis foam cutter 2.8 config

I upgraded our 4-axis hotwire foam cutter to 2.8
recently, and have not been able to get it running
again yet.  The auto conversion doesn't seem to
be quite sufficient for foam cutter configurations.

I now have homing on all four axes working (XY;UV),
but once homing is finished I can't jog U or V.  The
backplot shows motion, but the axes don't move.
X and Y jog properly.  The U and V (and joint 2 and
3) sections are copied directly from X/0 and Y/1
with only the axis and joint designation changing.

Does anybody have a functioning 2.8 foam cutter
configuration I could look at?

Thanks,
-- Ralph


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Re: [Emc-users] Code of Conduct

[Chris Radek]

Jeff,

Cool, thanks for doing this work.

Chris

On Mon, Jun 28, 2021 at 08:25:31PM -0500, Jeff Epler wrote:
> The LinuxCNC community including this mailing list now has a written
> code of conduct. Unless it's your idea of fun to harass other people,
> this is a big non-event for you.
> 
> You can read the code of conduct here:
> https://www.linuxcnc.org/CODE_OF_CONDUCT/
> 
> Jeff


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[Emc-users] Mister -- was RE: Mounting spindle sensors.

[John Dammeyer]

> From: Gene Heskett [mailto:ghesk...@shentel.net]
> I've found its extremely useful, so I'd move it up the list to
> considerably higher than 42. This "mist" can be quite dry and still do a
> great job without making a big mess. It shines particularly well when
> doing alu that gets gummy when it even thinks about more than room
> temps, I cut out 2 wrenches for the er collet of my 6040, out of cheap
> 1/2" alu, mist on and 11 to 14k revs, and used half an 8oz coke bottle
> of well diluted koolmist for both wrenches. About 10 psi of air, and a
> $7 peristaltic liquid pump that gets power for 4ms or so, about 2x a
> second. Just about enough pump to spit out a drop at a power bump.  All
> written into my .hal files and adjustable from axis with the mouse
> during operation.

Gene,
Can you share your hal file for that?  What did you put up onto AXIS so that 
your mouse could adjust the operation?

Thanks
John




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Re: [Emc-users] Mounting spindle sensors.

[John Dammeyer]

> From: John Dammeyer [mailto:jo...@autoartisans.com]
> Yeah not exclusive.  I screw up all the time.  In this case, the problem was 
> that when I changed the Knee from Stepper to Servo I
> changed the pulley.  Most of it slides on the shaft but there's no key.  So 
> instead I used the set screws to press on acrylic posts onto the
> square end of the shaft.

The original never had Z axis pulley slipping issues as the clamping onto the 
square section was a bit more robust.  See attached photo.

The best I could get with the 60V power supply, Gecko and 1200 oz-in motor was 
24 ipm.  Couldn't use this setup for the servo because the motor shaft diameter 
was so much larger that it wouldn't fit in the small pulley.

Is it only me or is LinuxCNC the easy part and the mechanicals the harder part?

John

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Re: [Emc-users] Mounting spindle sensors.

[John Dammeyer]

> From: Gene Heskett [mailto:ghesk...@shentel.net]
> > I've started on a mist system but it's currently project #42 so it
> > might be a while yet.
> 
> I've found its extremely useful, so I'd move it up the list to
> considerably higher than 42. 

Hi Gene, your comments reinforce that it's a good reason that as Project #42 a 
Mister is "The answer to life, the universe and everything".

John




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Re: [Emc-users] Mounting spindle sensors.

[Gregg Eshelman via Emc-users]

Video from 2009. Milling a hard metal file at 125 ipm with no cooling and from 
a start temp of 81F the file only warmed to 
89Fhttps://www.youtube.com/watch?v=DeJCzN90Aj4

I couldn't find the video from a shop that resharpened end mills, showing one 
rapidly carving the faces of a hard file held on edge.
 

On Thursday, July 1, 2021, 1:44:40 AM MDT, andrew beck 
 wrote:  
 
 John.  You really really should be running carbide endmills.  They can be
run dry and hot for most jobs.  And they are just so much nicer than hss.
It's great when you don't have to think to much about if the cutter is
going to overheat. And more just about what shape you want to cut.

Pm me and I'll connect you up to my endmill supplier you can just buy
direct.  (I sell carbide endmills all the time through my tooling company)  
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Re: [Emc-users] Mounting spindle sensors.

[fxkl47BF via Emc-users]

> I've found its extremely useful, so I'd move it up the list to
> considerably higher than 42. This "mist" can be quite dry and still do a
> great job without making a big mess. It shines particularly well when
> doing alu that gets gummy when it even thinks about more than room
> temps, I cut out 2 wrenches for the er collet of my 6040, out of cheap
> 1/2" alu, mist on and 11 to 14k revs, and used half an 8oz coke bottle
> of well diluted koolmist for both wrenches. About 10 psi of air, and a
> $7 peristaltic liquid pump that gets power for 4ms or so, about 2x a
> second. Just about enough pump to spit out a drop at a power bump. All
> written into my .hal files and adjustable from axis with the mouse
> during operation.

i apologize for be'n off topic but i watched a video of a guy mill'n aluminum
he used 99.9% alcohol in a mister
beautiful cuts


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Re: [Emc-users] Advice on Tuning Servo System

[Gene Heskett]

On Thursday 01 July 2021 04:54:32 Les Newell wrote:

> > Re-reading that, linuxcnc will not even start if they don't match
> > exactly.
>
> That's not my experience. What error message do you get?

I can't show it ATM as I haven't yet gone out to reboot those machine yet 
this morning, I'm still a quart low on coffee and having a heart to 
heart discussion with a 3d printer. 

As I recall it fusses about it and exits before it even draws the gui. 
Running master or master-gtk3, and its been that way for years. I'll get 
both eyes open and go check in an hour or 2.

Thanks Les.

> Les

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)
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] Mounting spindle sensors.

[andy pugh]

On Thu, 1 Jul 2021 at 08:35, John Dammeyer  wrote:

> I don't have a broach although with the spindle locked by the Servo I could 
> theoretically write G-Code to use some sort of tool to broach like a vertical 
> shaper

You can make a broach, if you have a lathe.

Start with a piece of square tool steel of the right dimensions, then
cut a taper and teeth in it on the lathe.

I think that both This Old Tony and Clickspring (at least) have videos
on Youtube on this.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912


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Re: [Emc-users] Mounting spindle sensors.

[Gene Heskett]

On Thursday 01 July 2021 03:31:56 John Dammeyer wrote:

> > From: marcus.bow...@visible.eclipse.co.uk
> > [mailto:marcus.bow...@visible.eclipse.co.uk]
> >
> > On 2021-07-01 02:54, John Dammeyer wrote:
> > > With a bit of oil on the part the chips come off
> > > smoking.
> >
> > A little more oil will cure or at least reduce the smoking. Flood
> > would cure it completely, but more neat oil squirted on will do the
> > trick.
>
> Thanks for the feedback.  There is a pump etc for flood on this mill
> but I don't do enough to justify filling the reservoir for the amount
> of milling I do while I'm still converting to CNC.  Plus no liquid
> shields as yet.  A rag over the keyboard keeps the chips out.
>
> I've started on a mist system but it's currently project #42 so it
> might be a while yet.

I've found its extremely useful, so I'd move it up the list to 
considerably higher than 42. This "mist" can be quite dry and still do a 
great job without making a big mess. It shines particularly well when 
doing alu that gets gummy when it even thinks about more than room 
temps, I cut out 2 wrenches for the er collet of my 6040, out of cheap 
1/2" alu, mist on and 11 to 14k revs, and used half an 8oz coke bottle 
of well diluted koolmist for both wrenches. About 10 psi of air, and a 
$7 peristaltic liquid pump that gets power for 4ms or so, about 2x a 
second. Just about enough pump to spit out a drop at a power bump.  All 
written into my .hal files and adjustable from axis with the mouse 
during operation.

> > How's my speed?  Too fast?  Too slow?  Just . right?
> >
> > You could up the feed rate by 1/3, to 100mm/min (4in/min)in steel, I
> > think. It all depends on how comfortable you and the mill feel.
>
> I started with 4 ipm but found things just shook a bit too much.  So
> upped the RPM on the spindle and cut the feed down a bit.  Looking at
> what MecSoft CAM appears to suggest is depth could be as much as half
> the tool diameter but step over still at 0.25 of tool diameter.
>
> It's all about chip load I guess but then you have to know what type
> of metal.  This stuff is fairly soft I think.
>
> > > The second part had a small disaster but I'll comment on that in a
> > > separate posting.
>
> See below
>
> > So you belong to the same not_very_exclusive club as me, then...
> >
> > Marcus
>
> Yeah not exclusive.  I screw up all the time.  In this case, the
> problem was that when I changed the Knee from Stepper to Servo I
> changed the pulley.  Most of it slides on the shaft but there's no
> key.  So instead I used the set screws to press on acrylic posts onto
> the square end of the shaft.
>
> Why acrylic?  When you are testing things and can run into end stops
> etc. the shearing of plastic helps prevent further rotation.  However
> forgot all about them.  The intention was to replace them with brass
> pins.
>
> Well while I was cutting the hex end, the plastic sheared and suddenly
> Z motion stopped.  Small detour to turn off the heads of 10-32 brass
> screws.  Insert screws, set screws and tighten.  Home and go to zero. 
> Finish cutting hex after re-touching off Z since the plastic must have
> been already causing issues and the Z0 was no longer correct.
>
> I don't have a broach although with the spindle locked by the Servo I
> could theoretically write G-Code to use some sort of tool to broach
> like a vertical shaper.  Be nice to make an insert that is round on
> the outside, square on the inside and the setscrews lock it in place.
>
> Once the spindle sensors are in place I'll switch over from PWM 0-10V
> to using the StepGen.  No wiring change.  Just load a different BIT
> file into the 7i92H.   Already tested all that with the Pi4 LCNC. 
> Theoretically then I should be able to also position the spindle for
> square broaching.  Or something like Sam S. was doing with a boring
> tool and XY positioning.
>
> John


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)
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] Advice on Tuning Servo System

[Les Newell]

Re-reading that, linuxcnc will not even start if they don't match
exactly.


That's not my experience. What error message do you get?

Les


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Re: [Emc-users] Mounting spindle sensors.

[Les Newell]

The feed and spindle speed looks about right. I'd use carbide then 
double or triple feed + speed. With carbide in steel, coolant/oil is 
optional. A lot depends on the rigidity of the machine and setup but I'd 
also probably take the cut in one pass or maybe two. Making lots of 
small passes is hard on the cutter. You end up wearing out the end while 
the rest of the cutter is still sharp.


Les

On 01/07/2021 02:54, John Dammeyer wrote:

OK.  Just a quick video with of course some questions.
https://youtu.be/BpafBR_Cfuw

Here's the cutting of one flat.  As the video comments state:

Spindle RPM 833, Feed Rate 3 ipm, Cutter size 14mm (0.55")
Stepover is 0.15" or about 25% of cutter diameter  (2 flute HSS)
Depth of cut is 0.025" per pass
Total depth to create 5/8" hex size is 0.1025".  Spin Index turned 60 degrees 
and then G-Code started again.

I arrived at these values by trial and error using the MDI interface.  Once I 
had a reasonable set of movements I used the capture highlighted MDI commands 
to clip board.  First time for that.  Then paste into text file.  Add a few 
more G-Code items.  Then save and load into AXIS.

And run.  After the first couple of flats I started doing other things.  When 
the spindle stopped went over and rotated.

And yes Andy Pugh, I really do need to get my STMBL driven Harmonic Drive going...  


Anyway, my question.  With a bit of oil on the part the chips come off smoking. 
 How's my speed?  Too fast?  Too slow?  Just . right?  (I sound like 
goldilocks and the 3 bears).

The second part had a small disaster but I'll comment on that in a separate 
posting.

John





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Re: [Emc-users] Mounting spindle sensors.

[andrew beck]

John.  You really really should be running carbide endmills.  They can be
run dry and hot for most jobs.  And they are just so much nicer than hss.
It's great when you don't have to think to much about if the cutter is
going to overheat. And more just about what shape you want to cut.

Pm me and I'll connect you up to my endmill supplier you can just buy
direct.  (I sell carbide endmills all the time through my tooling company)

On Thu, Jul 1, 2021, 7:35 PM John Dammeyer  wrote:

> > From: marcus.bow...@visible.eclipse.co.uk [mailto:
> marcus.bow...@visible.eclipse.co.uk]
> >
> > On 2021-07-01 02:54, John Dammeyer wrote:
> > > With a bit of oil on the part the chips come off
> > > smoking.
> >
> > A little more oil will cure or at least reduce the smoking. Flood would
> > cure it completely, but more neat oil squirted on will do the trick.
>
> Thanks for the feedback.  There is a pump etc for flood on this mill but I
> don't do enough to justify filling the reservoir for the amount of milling
> I do while I'm still converting to CNC.  Plus no liquid shields as yet.  A
> rag over the keyboard keeps the chips out.
>
> I've started on a mist system but it's currently project #42 so it might
> be a while yet.
>
> > How's my speed?  Too fast?  Too slow?  Just . right?
> >
> > You could up the feed rate by 1/3, to 100mm/min (4in/min)in steel, I
> > think. It all depends on how comfortable you and the mill feel.
>
> I started with 4 ipm but found things just shook a bit too much.  So upped
> the RPM on the spindle and cut the feed down a bit.  Looking at what
> MecSoft CAM appears to suggest is depth could be as much as half the tool
> diameter but step over still at 0.25 of tool diameter.
>
> It's all about chip load I guess but then you have to know what type of
> metal.  This stuff is fairly soft I think.
> >
> > > The second part had a small disaster but I'll comment on that in a
> > > separate posting.
>
>
> See below
> >
> > So you belong to the same not_very_exclusive club as me, then...
> >
> > Marcus
>
> Yeah not exclusive.  I screw up all the time.  In this case, the problem
> was that when I changed the Knee from Stepper to Servo I changed the
> pulley.  Most of it slides on the shaft but there's no key.  So instead I
> used the set screws to press on acrylic posts onto the square end of the
> shaft.
>
> Why acrylic?  When you are testing things and can run into end stops etc.
> the shearing of plastic helps prevent further rotation.  However forgot all
> about them.  The intention was to replace them with brass pins.
>
> Well while I was cutting the hex end, the plastic sheared and suddenly Z
> motion stopped.  Small detour to turn off the heads of 10-32 brass screws.
> Insert screws, set screws and tighten.  Home and go to zero.  Finish
> cutting hex after re-touching off Z since the plastic must have been
> already causing issues and the Z0 was no longer correct.
>
> I don't have a broach although with the spindle locked by the Servo I
> could theoretically write G-Code to use some sort of tool to broach like a
> vertical shaper.  Be nice to make an insert that is round on the outside,
> square on the inside and the setscrews lock it in place.
>
> Once the spindle sensors are in place I'll switch over from PWM 0-10V to
> using the StepGen.  No wiring change.  Just load a different BIT file into
> the 7i92H.   Already tested all that with the Pi4 LCNC.  Theoretically then
> I should be able to also position the spindle for square broaching.  Or
> something like Sam S. was doing with a boring tool and XY positioning.
>
> John
>
>
>
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Re: [Emc-users] Mounting spindle sensors.

[marcus . bowman]

On 2021-07-01 02:54, John Dammeyer wrote:

With a bit of oil on the part the chips come off
smoking.


A little more oil will cure or at least reduce the smoking. Flood would 
cure it completely, but more neat oil squirted on will do the trick.

How's my speed?  Too fast?  Too slow?  Just . right?

You could up the feed rate by 1/3, to 100mm/min (4in/min)in steel, I 
think. It all depends on how comfortable you and the mill feel.



The second part had a small disaster but I'll comment on that in a
separate posting.


So you belong to the same not_very_exclusive club as me, then...

Marcus


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