[Emc-users] Where can I get absolute, reference z home=0 z position?

2018-08-18 Thread Gene Heskett 
Greetings guys;

I have a little over 2 feet of 1/2" A2 chucked in the ER40 kit on the 
Sheldon, and I have pushed and pulled on the middle of it so its within 
about 6 thou to dead straight watching it turn slowly with a dial.  I 
had, when only about 1/4" was projecting from the ER40, put a center 
drill into the end of it, cutting very slowly so it would be fairly 
close to center, and watching the dial, it has about a 3.8 thou wobble 
about 1/4" from a snugged up dead center, and I've used that to center 
the tailstock. Elevation of course is still iffy. We'll ignore that for 
the moment.

I'm about to install a lincurve/offset kit and adjust it to center the 
wobble up on the zero of the dial at as many places as I can, but to do 
that accurately, the lincurve reference input must not be effected by Z 
touch offs etc, only by the absolute Z position established when it was 
homed.

It appears the bed is worn such that it would be turning about 3 thou 
small in the max wear in front of the spindle area, then fades in a 
relatively straight pattern from about a foot away to the end of my A2 
rod. So It's not quite Moglic time yet if lincurve and offset can be 
made to compensate.

So, where do I get this absolute Z position to feed lincurve from?

Poking around with a halmeter, I can't find  it. And the man page makes 
no mention of enabling motion.debug pins, which are 100% missing.

Cheers all, Gene Heskett

--
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 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Where can I get absolute, reference z home=0 z position?

2018-08-28 Thread Gene Heskett 
On Saturday 18 August 2018 15:53:15 Gene Heskett wrote:

Ping?

> Greetings guys;
>
> I have a little over 2 feet of 1/2" A2 chucked in the ER40 kit on the
> Sheldon, and I have pushed and pulled on the middle of it so its
> within about 6 thou to dead straight watching it turn slowly with a
> dial.  I had, when only about 1/4" was projecting from the ER40, put a
> center drill into the end of it, cutting very slowly so it would be
> fairly close to center, and watching the dial, it has about a 3.8 thou
> wobble about 1/4" from a snugged up dead center, and I've used that to
> center the tailstock. Elevation of course is still iffy. We'll ignore
> that for the moment.
>
> I'm about to install a lincurve/offset kit and adjust it to center the
> wobble up on the zero of the dial at as many places as I can, but to
> do that accurately, the lincurve reference input must not be effected
> by Z touch offs etc, only by the absolute Z position established when
> it was homed.
>
> It appears the bed is worn such that it would be turning about 3 thou
> small in the max wear in front of the spindle area, then fades in a
> relatively straight pattern from about a foot away to the end of my A2
> rod. So It's not quite Moglic time yet if lincurve and offset can be
> made to compensate.
>
> So, where do I get this absolute Z position to feed lincurve from?
>
> Poking around with a halmeter, I can't find  it. And the man page
> makes no mention of enabling motion.debug pins, which are 100%
> missing.
>
> Cheers all, 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 
>
> --
> Check out the vibrant tech community on one of the world's
> most engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> ___
> Emc-users mailing list
> 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)
Genes Web page 

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Re: [Emc-users] Where can I get absolute, reference z home=0 z position?

2018-08-28 Thread Les Newell 

Hi Gene,


So, where do I get this absolute Z position to feed lincurve from?


Assuming you have a cartesian machine joint.N.pos-fb is probably the way 
to go. That's what I used when I did something similar on my lathe.


Les

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Re: [Emc-users] Where can I get absolute, reference z home=0 z position?

2018-08-28 Thread Gene Heskett 
On Tuesday 28 August 2018 09:22:12 Les Newell wrote:

> Hi Gene,
>
> > So, where do I get this absolute Z position to feed lincurve from?
>
> Assuming you have a cartesian machine joint.N.pos-fb is probably the
> way to go. That's what I used when I did something similar on my
> lathe.
>
> Les
>
That would likely work and well Les, if indeed that data is referenced to 
the machines location vis-a-vis its actually 0.00 at a g53 g0 z0. 
nothing else is such a permanent reference. I'll make some tests. If it 
moves with a touch off or tool loaded but not g43'd, its not too 
valuable.

Now to feed the missus and refill her coffee cup with freshly brewed, and 
I'll hang a halmeter on it and find out.

Thanks Les.
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-- 
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] Where can I get absolute, reference z home=0 z position?

2018-08-28 Thread Gene Heskett 
On Tuesday 28 August 2018 09:58:16 Gene Heskett wrote:

> On Tuesday 28 August 2018 09:22:12 Les Newell wrote:
> > Hi Gene,
> >
> > > So, where do I get this absolute Z position to feed lincurve from?
> >
> > Assuming you have a cartesian machine joint.N.pos-fb is probably the
> > way to go. That's what I used when I did something similar on my
> > lathe.
> >
> > Les
>
> That would likely work and well Les, if indeed that data is referenced
> to the machines location vis-a-vis its actually 0.00 at a g53 g0
> z0. nothing else is such a permanent reference. I'll make some tests.
> If it moves with a touch off or tool loaded but not g43'd, its not too
> valuable.
>
> Now to feed the missus and refill her coffee cup with freshly brewed,
> and I'll hang a halmeter on it and find out.
>
> Thanks Les.

I don't have a joint.N.pos-fb,but I do have a joint.N.motor-pos-fb. I'm 
running master on the r-pi 3b.

But, in order for it to be consistent, I have to "rm hm2-stepper.var" 
before I start LCNC -l, then its about .0006" from zero at the parking 
point after homing, and seems to be immune to touch offs. For my 
purposes thats plenty accurate enough.  However, it will go thru zero to 
negative values by the time a tool gets close enough to work on 
something in the currently mounted ER-40 adapter as home is around 3" 
out from it. I'll have to find out if lincurve can work both sides of 
zero. I suspect it can or Andy would have fixed it long ago since its 
his code. ;-)

Thanks Les, I believe I can make it work.
> > 
> >--  Check out the vibrant tech community on one of the
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-- 
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] Where can I get absolute, reference z home=0 z position?

2018-08-28 Thread Les Newell 

Hi Gene,


I don't have a joint.N.pos-fb,but I do have a joint.N.motor-pos-fb.


 That's 'cos I can't type... :-[


But, in order for it to be consistent, I have to "rm hm2-stepper.var"


AFAIK that file stores persistent parameters. I have no idea why you 
should need to delete it.



I'll have to find out if lincurve can work both sides of
zero.



I don't see why it shouldn't.

Les

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Re: [Emc-users] Where can I get absolute, reference z home=0 z position?

2018-08-28 Thread Gene Heskett 
On Tuesday 28 August 2018 11:11:50 Les Newell wrote:

> Hi Gene,
>
> > I don't have a joint.N.pos-fb,but I do have a joint.N.motor-pos-fb.
>
>  That's 'cos I can't type... :-[
>
Common problem, it WILL get worse as the years pile up.

> > But, in order for it to be consistent, I have to "rm
> > hm2-stepper.var"
>
> AFAIK that file stores persistent parameters. I have no idea why you
> should need to delete it.
>
It loaded that signal with a -7 something figure after rehoming. No clue 
why. Otoh, it hadn't been deleted in at least a year, and there have 
been several un-announced power cuts which may have left it trashed. No 
UPS on that rpi card.

> > I'll have to find out if lincurve can work both sides of
> > zero.
>
> I don't see why it shouldn't.
>
> Les
>
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-- 
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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