Re: [Emc-users] losing encoder counts

[gene heskett]

On 10/6/22 15:06, John Figie wrote:

A colleague once told me that the harder a bug is to find then the
easier it is to fix. I think there is a lot of truth to that.

John Figie
That is a given John. When a bug is hard to find, you start paying 
attention to every byte, and become one
with the code. And its always a face slapper when you finally recognize 
the exact miss-programmed byte.
I hate to admit its a lesson it took me 70 years to learn the basic 
truth of.



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] losing encoder counts

[John Figie]

A colleague once told me that the harder a bug is to find then the
easier it is to fix. I think there is a lot of truth to that.

John Figie

On Thu, Oct 6, 2022 at 12:44 PM Thaddeus Waldner  wrote:
>
> The solution to hard problems are always in the peripheral vision.
>
>
> > On Oct 6, 2022, at 12:20 PM, gene heskett  wrote:
> >
> > On 10/5/22 22:56, Jon Elson wrote:
> >> Wow, it gets deeper!
> >>
> >> It is NOT the encoder, or anything in the encoder-reading process.
> >>
> >> I marked the motor shaft, and the motor is returning to the exact same 
> >> position every cycle.
> >>
> >> Well, I tried a different indicator and mount, and the problem was in the 
> >> indicator mount!  I was using an old knock-off of an IndiCol that clamps 
> >> around the spindle nose or end mill holder and has several rods with 
> >> locking thumbnuts on them.  These swivel joints were slipping just a tiny 
> >> bit each time the vise touched the indicator, even though they were PRETTY 
> >> tight!  Ugh, 3 days of going around in circles trying to tell where the 
> >> issue was!
> >>
> >> Jon
> >>
> > Glad you found it, Jon. And don't feel like the lone stranger, I've been 
> > caught out by such stuff lots of times.
> >
> > 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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> > Emc-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-users
>
>
>
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Re: [Emc-users] losing encoder counts

[Thaddeus Waldner]

The solution to hard problems are always in the peripheral vision.


> On Oct 6, 2022, at 12:20 PM, gene heskett  wrote:
> 
> On 10/5/22 22:56, Jon Elson wrote:
>> Wow, it gets deeper!
>> 
>> It is NOT the encoder, or anything in the encoder-reading process.
>> 
>> I marked the motor shaft, and the motor is returning to the exact same 
>> position every cycle.
>> 
>> Well, I tried a different indicator and mount, and the problem was in the 
>> indicator mount!  I was using an old knock-off of an IndiCol that clamps 
>> around the spindle nose or end mill holder and has several rods with locking 
>> thumbnuts on them.  These swivel joints were slipping just a tiny bit each 
>> time the vise touched the indicator, even though they were PRETTY tight!  
>> Ugh, 3 days of going around in circles trying to tell where the issue was!
>> 
>> Jon
>> 
> Glad you found it, Jon. And don't feel like the lone stranger, I've been 
> caught out by such stuff lots of times.
> 
> 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] losing encoder counts

[gene heskett]

On 10/5/22 22:56, Jon Elson wrote:

Wow, it gets deeper!

It is NOT the encoder, or anything in the encoder-reading process.

I marked the motor shaft, and the motor is returning to the exact same 
position every cycle.


Well, I tried a different indicator and mount, and the problem was in 
the indicator mount!  I was using an old knock-off of an IndiCol that 
clamps around the spindle nose or end mill holder and has several rods 
with locking thumbnuts on them.  These swivel joints were slipping 
just a tiny bit each time the vise touched the indicator, even though 
they were PRETTY tight!  Ugh, 3 days of going around in circles trying 
to tell where the issue was!


Jon

Glad you found it, Jon. And don't feel like the lone stranger, I've been 
caught out by such stuff lots of times.


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] losing encoder counts

[dave engvall]

This make a good case for dual independent encoders. motor 
shaft/ballscrew, ballscrew/glass scale, steps/glass scale, etc.
Just for grins I tried the hand crank on my well used (Boeing then trade 
school, the auction) defunct tracer mill converter by a Russian engineer 
to cnc for the trade school. 1963 vntage cinci. Comparing the hand crank 
on the X vs a accurite 5 um glass scale they were dead on (of course 
only in one direction) ;-) The Y was a mess so I didn't try it.
It is relatively easy to clamp a glass scale to the bed, dial it in 
parallel to the axis then tie it to the spindle with the spindle power 
carefully disabled and proceed with measurements. Notice I did not say 
much about a Chinese glass scale. Some are good some not so good. You 
pays your money and takes your chances.


Dave

On 10/5/22 7:53 PM, Jon Elson wrote:

Wow, it gets deeper!

It is NOT the encoder, or anything in the encoder-reading process.

I marked the motor shaft, and the motor is returning to the exact same 
position every cycle.


Well, I tried a different indicator and mount, and the problem was in 
the indicator mount!  I was using an old knock-off of an IndiCol that 
clamps around the spindle nose or end mill holder and has several rods 
with locking thumbnuts on them.  These swivel joints were slipping 
just a tiny bit each time the vise touched the indicator, even though 
they were PRETTY tight!  Ugh, 3 days of going around in circles trying 
to tell where the issue was!


Jon



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