Re: [Emc-users] First project with LinuxCNC.

[John Dammeyer]

> From: Roland Jollivet [mailto:roland.jolli...@gmail.com]
> The thing about home/limit switches is that you can actually mount them far
> from the engagement point, say two feet away. Use a hard, sprung rod to
> transfer the action.
> I've also come across switches that you can barely depress with your
> finger, so that any oil/gunk gets squeezed out the way before it trips.


Thanks Roland
These are temporary in the sense that I want the safety and repeatability of 
home/limit but they are not the final solution.  
Since the mill has a power feed on the RHS of the X I'm tempted to cut the 
wires for the limit switch in the middle and use it for example.  And then 
clone something like that for the other axis (or for all of them).

My DRO scales are in the way for some of this.  I still need to add oiler tubes 
etc.  This mill is similar to a Grizzly G3616 that I bought over 10 years ago 
new for about $3600Cdn.  Anything even close to that size and mass now is over 
$8K.  I really like the DRO but at some point I won't really need it and it's 
not impervious to flood coolant so there's tons of work to do on this.

Or throw money at it and replace it with a HAAS.  But then what would I do...

John




___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

[Emc-users] First project with LinuxCNC.

[Roland Jollivet]

The thing about home/limit switches is that you can actually mount them far
from the engagement point, say two feet away. Use a hard, sprung rod to
transfer the action.
I've also come across switches that you can barely depress with your
finger, so that any oil/gunk gets squeezed out the way before it trips.


On Thu, 11 Jul 2019 at 16:17, Gene Heskett  wrote:

> On Thursday 11 July 2019 00:11:33 John Dammeyer wrote:
>
> > Well.  Not the best in the world. And lots of false starts as much due
> > to CAM management and G-Code generation.  But the limit switch holders
> > for the Y axis are done.  LinuxCNCwith one parallel port, two HP_UHU
> > Servo drives, one Gecko Knee Stepper drive.   The HB04 Pendant made
> > this a lot easier.
> >
> > Now to figure out how to mount a Knee Home Switch.
> >
> > And properly configure a tool table with the tool heights.
> >
> > John Dammeyer
>
> Those look pretty darned solid John, better than any I've done, but I am
> usually more space constained too. My new 6040 gantry's y home is a jury
> rig if there ever was one, and subject to whatever overtravel up to
> about 1/16" before the gantry crashes.  So I have the switch, a teeny
> pushbutton mounted with about 10 thou of button travel, mounted on a
> 1/16" thick 2.5" length of alu about 3/8" wide, bolted to the front face
> of the bed so the switch hangs out past the bed facing to the rear, with
> a 4-40 screw planted in the face of the gantry edge to push it. The
> boltdown screws are a long inch away from the switch, allowing the alu
> to flex about 1/8" without permanent deformation after the switch is
> bottomed. With the 4-40 screw set for the length of stickout to keep it
> from crashing, I can feel the mount flex as it homes, but cannot see it.
> I've std roller micros in other places. With 5 dollars a bag of ten
> switches, repeatability is well under a thou all around. I'm pleased,
> which is what counts. Limits are set in the .ini file, about 50 thou
> from crashing at the other end of the range.
>
> I may replace the z motor yet, all of them are very small nema 23's, and
> with the weight of the spindle motor on the z sled, lift speed is
> restricted to about 1/3 the maxvel of the x and y dirs, currently set at
> about 190"/minute.
>
> No labels on the motors, and no data on the dip switch settings of the
> tb6560 drivers I took out, so motor currents are set in the low 2's
> based on motor heating. I replaced that whole control box since I was
> unable to even get a full translation of the Chinese manual out of
> googles translator. So it now has a quad of 2m542's that used to drive
> my hf mill. and a clone 1.5 horse 120 volt vfd.  Runs either direction.
> But if I use tool contact to set tlo with a g38.2, I have to clip a
> ground onto the tool. Too much of that grey epoxy paint to get a ground
> anyplace. Even the motor to spindle doesn't reliably get thru the
> spindles bearings.
>
> Thanks 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 
>
>
> ___
> 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] First project with LinuxCNC.

[Gene Heskett]

On Thursday 11 July 2019 00:11:33 John Dammeyer wrote:

> Well.  Not the best in the world. And lots of false starts as much due
> to CAM management and G-Code generation.  But the limit switch holders
> for the Y axis are done.  LinuxCNCwith one parallel port, two HP_UHU
> Servo drives, one Gecko Knee Stepper drive.   The HB04 Pendant made
> this a lot easier.
>
> Now to figure out how to mount a Knee Home Switch.
>
> And properly configure a tool table with the tool heights.
>
> John Dammeyer

Those look pretty darned solid John, better than any I've done, but I am 
usually more space constained too. My new 6040 gantry's y home is a jury 
rig if there ever was one, and subject to whatever overtravel up to 
about 1/16" before the gantry crashes.  So I have the switch, a teeny 
pushbutton mounted with about 10 thou of button travel, mounted on a 
1/16" thick 2.5" length of alu about 3/8" wide, bolted to the front face 
of the bed so the switch hangs out past the bed facing to the rear, with 
a 4-40 screw planted in the face of the gantry edge to push it. The 
boltdown screws are a long inch away from the switch, allowing the alu 
to flex about 1/8" without permanent deformation after the switch is 
bottomed. With the 4-40 screw set for the length of stickout to keep it 
from crashing, I can feel the mount flex as it homes, but cannot see it.  
I've std roller micros in other places. With 5 dollars a bag of ten 
switches, repeatability is well under a thou all around. I'm pleased, 
which is what counts. Limits are set in the .ini file, about 50 thou 
from crashing at the other end of the range.

I may replace the z motor yet, all of them are very small nema 23's, and 
with the weight of the spindle motor on the z sled, lift speed is 
restricted to about 1/3 the maxvel of the x and y dirs, currently set at 
about 190"/minute.

No labels on the motors, and no data on the dip switch settings of the 
tb6560 drivers I took out, so motor currents are set in the low 2's 
based on motor heating. I replaced that whole control box since I was 
unable to even get a full translation of the Chinese manual out of 
googles translator. So it now has a quad of 2m542's that used to drive 
my hf mill. and a clone 1.5 horse 120 volt vfd.  Runs either direction.  
But if I use tool contact to set tlo with a g38.2, I have to clip a 
ground onto the tool. Too much of that grey epoxy paint to get a ground 
anyplace. Even the motor to spindle doesn't reliably get thru the 
spindles bearings.

Thanks 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 


___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

Re: [Emc-users] First project with LinuxCNC.

[marcus . bowman]

John Dammeyer said:

Well. Not the best in the worldMarcus says:That rather depends on how
you define 'best'. Personally, I would say that the result certainly
is the 'best' in the sense that producing the work and proving the
machine and workflow is the optimum outcome at this stage.Deserves not
only a cup of tea, but a biscuit too.(Apologies for the format of this
message. I'm unfamiliar with the behaviour of the web email client on
this machine.)



___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users

[Emc-users] First project with LinuxCNC.

[John Dammeyer]

Well.  Not the best in the world. And lots of false starts as much due to CAM 
management and G-Code generation.  But the limit switch holders for the Y axis 
are done.  LinuxCNCwith one parallel port, two HP_UHU Servo drives, one Gecko 
Knee Stepper drive.   The HB04 Pendant made this a lot easier.
 
Now to figure out how to mount a Knee Home Switch.
 
And properly configure a tool table with the tool heights.
 
John Dammeyer
 

 
___
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users