Re: [Emc-users] looking for inexpensive modular encoder

[Gene Heskett]

On Tuesday 14 July 2015 23:34:25 Pete Matos wrote:
> http://www.cui.com/catalog/components/encoders/incremental/modular 
> will these work?

I'd like to look at this stuff Pete, but my iceweasel, when I click on 
save link as, does not download the pdf, but the html wrapper code.

Is this an iceweasel screwup, or the web site's mimetyping?  That seems 
to be correct, it is text/html.  But no .pdf is forthcoming.

I just tried konquerer, and it cannot even load the link above.

> On Tue, Jul 14, 2015 at 11:22 PM, Jon Elson  
wrote:
> > On 07/14/2015 09:45 PM, Kirk Wallace wrote:
> > > I used to be a fan of USD. I made my lathe encoders using their 2"
> > > disks and sensors and they are still working well.
> > > http://www.wallacecompany.com/cnc_lathe/HNC/1-1a.jpg
> > >
> > > I still like the idea of using disks and sensors and making the
> > > rest but it's not nearly as cheap as it used to be.
> > >
> > > 1" Disk, 1000 CPR = $9 @ 50 qty
> > > Sensor = $25 @ 50 qty
> > >
> > > Then come up with housings = $?
> >
> > Yes, this is the problem, housings.  The HEDS are a nice
> > little package, relatively dust-proof, just snaps together
> > once you mount the mounting plate to the motor, I can put it
> > on in about a minute per unit.  I don't want to be making
> > housings or any other special stuff.  I sell these
> > motor/encoder units just to help move along my servo amps.
> >
> > Jon
> >
> >
> > 
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Cheers, Gene Heskett
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Re: [Emc-users] looking for inexpensive modular encoder

[Dave Cole]

On 7/14/2015 9:41 PM, Jon Elson wrote:
> On 07/14/2015 11:59 AM, Dave Cole wrote:
>> I'm not actually answering your question; but have you looked at the
>> shaft encoders on Ebay recently?
>> There were some $15 units the last time I looked.  It might make sense
>> to adapt to some of those?
>>
>> $43 seems like a lot of money for the modular units considering what is
>> delivered.
>>
> I can't use eBay items in a product I sell on my web site.
>
> What I'm looking for is a 1000 cycle/rev encoder with index
> that fits on a 1/4" motor shaft.  For some odd reason, the
> Avago part cannot be had in 1000 cycle/rev with the 1/4"
> shaft, although a number of other resolutions are available.
> Renco and US Digital used to have such items, but they are
> now over $74 each.
>
> CUI is definitely cheaper, but has a few features I don't like.
>
> Jon
>

I don't know what happened to US Digital.   Didn't they use to advertise 
a $25 encoder at one time?
Many of those Chinese Ebay sellers sell product that is also available 
on Alibaba.   My point is that if they can sell it for $15 for a shaft 
encoder you should be able to do as well or better via
Alibaba.

Dave

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Re: [Emc-users] looking for inexpensive modular encoder

[Pete Matos]

http://www.cui.com/catalog/components/encoders/incremental/modular  will
these work?



On Tue, Jul 14, 2015 at 11:22 PM, Jon Elson  wrote:

> On 07/14/2015 09:45 PM, Kirk Wallace wrote:
> >
> > I used to be a fan of USD. I made my lathe encoders using their 2" disks
> > and sensors and they are still working well.
> > http://www.wallacecompany.com/cnc_lathe/HNC/1-1a.jpg
> >
> > I still like the idea of using disks and sensors and making the rest but
> > it's not nearly as cheap as it used to be.
> >
> > 1" Disk, 1000 CPR = $9 @ 50 qty
> > Sensor = $25 @ 50 qty
> >
> > Then come up with housings = $?
> Yes, this is the problem, housings.  The HEDS are a nice
> little package, relatively dust-proof, just snaps together
> once you mount the mounting plate to the motor, I can put it
> on in about a minute per unit.  I don't want to be making
> housings or any other special stuff.  I sell these
> motor/encoder units just to help move along my servo amps.
>
> Jon
>
>
> --
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>



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Re: [Emc-users] looking for inexpensive modular encoder

[Jon Elson]

On 07/14/2015 09:45 PM, Kirk Wallace wrote:
>
> I used to be a fan of USD. I made my lathe encoders using their 2" disks
> and sensors and they are still working well.
> http://www.wallacecompany.com/cnc_lathe/HNC/1-1a.jpg
>
> I still like the idea of using disks and sensors and making the rest but
> it's not nearly as cheap as it used to be.
>
> 1" Disk, 1000 CPR = $9 @ 50 qty
> Sensor = $25 @ 50 qty
>
> Then come up with housings = $?
Yes, this is the problem, housings.  The HEDS are a nice 
little package, relatively dust-proof, just snaps together 
once you mount the mounting plate to the motor, I can put it 
on in about a minute per unit.  I don't want to be making 
housings or any other special stuff.  I sell these 
motor/encoder units just to help move along my servo amps.

Jon

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Re: [Emc-users] looking for inexpensive modular encoder

[Kirk Wallace]

On 07/14/2015 06:41 PM, Jon Elson wrote:

> What I'm looking for is a 1000 cycle/rev encoder with index
> that fits on a 1/4" motor shaft.  For some odd reason, the
> Avago part cannot be had in 1000 cycle/rev with the 1/4"
> shaft, although a number of other resolutions are available.
> Renco and US Digital used to have such items, but they are
> now over $74 each.

I used to be a fan of USD. I made my lathe encoders using their 2" disks
and sensors and they are still working well.
http://www.wallacecompany.com/cnc_lathe/HNC/1-1a.jpg

I still like the idea of using disks and sensors and making the rest but 
it's not nearly as cheap as it used to be.

1" Disk, 1000 CPR = $9 @ 50 qty
Sensor = $25 @ 50 qty

Then come up with housings = $?


-- 
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http://www.wallacecompany.com/E45/

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Re: [Emc-users] Just In Case, Fanuc MPG

[Gene Heskett]

On Tuesday 14 July 2015 20:18:02 Kirk Wallace wrote:
> On 07/14/2015 10:43 AM, Gene Heskett wrote:
> > On Tuesday 14 July 2015 10:49:08 Kirk Wallace wrote:
> >> On 07/14/2015 04:02 AM, Gene Heskett wrote:
> >>
> >> ... snip
> >>
> >> well. All the MPGs had a generous application of a messy black
> >> grease. I'm guessing it's some type of molybdenum grease.
> >
> > I am in concurrence on that, and I would probably dip into a small
> > jar of barrel treatment grease for its replacement.  Do you need
> > some?
>
> I inherited a variety of lubricants from my Dad that I've had on the
> shelf for decades. There is a bucket of moly grease there that I will
> likely pass on to someone else.

I expect that will happen to my stock also.

> ... snip
>
> >> center section is 3mm dia. and the pins 1.8mm. If it doesn't work
> >> out, I know a guy that can make more ( :) ).
> >
> > Oh, who might that be except for yourself?  Does he work cheap
> > enough? 
>
> I have a crew; me, myself, and I

As long as they don't start an argument or go on strike. :)
My back goes out way more than I do.

> > Can you get drill rod that size?  And how wide is the roller
> > section?
>
> I haven't measured it yet, but it's probably close to 2mm wide with
> each pin at 2mm each. I suspect I'll be turning 90% of the stock into
> chips. The roller is already in the piece of stock, I just need to get
> rid or the unneeded bits.

Like me, I started with what was a huge block of alu to make that 
mounting sleeve, and like the sculpter carving an elephant, removing 
anything that didn't look like an elephant. I have a 40 gallon  trash 
can on the shop deck, 1/4 full of alu swarf. But I found that sleeve 
hiding in it. :)

Cheers, Gene Heskett
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 soap, ballot, jury, and ammo. Please use in that order."
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[Emc-users] first thoughts on a remote gcode executor (longish)

[Jerry Scharf]

Hi,

I am putting up some first thoughts on something that will be able to take
a stream of gcode commands over the net and do something useful to drive a
CNC machine. I welcome all thoughts and opinions on what is useful in what
we are looking at and ways to get the job done. If people decide it's
useful, I have no problems sharing it but will promise there is no support
beyond our own needs at this point. (This isn't to say that a good idea
won't be done if it isn't in our critical path, but if, when and how are
unknown.)

thanks in advance,
jerry


Thoughts for remote gcode execution python script

Our goal is to be able to run the CNC machine being driven from software
running on a different computer. It's more of a robot than a manufacturing
machine. This is very different than the design a part, generate gcode,
load the gcode onto the machine and run it model.

At the same time, I figure this may be useful to others if we get the
requirements right. One example is the ability to make smarter user
interfaces by having particular places in the gcode where the driving
software knows to check for state or errors and give specific guidance to
the user.

The key point is that I don't require but kind of expect the thing on the
other end to be smarter than a file copy.

It seems that the easiest way to do this is to put together a python
program using the python interface to linuxcnc.


 Basic idea

   -

   everything that is sent is either gcode or a comment
   -

   comments are denoted with “;”
   -

   comments that have only white space before ; and the next non-white
   character is “!” is an executor command
   -

   There are two modes: run and debug
   -

   simplest communications first: commands on standard input of the script,
   remote access is external to script
   -

   there is a lock file so only 1 script can run at a time
   -

   single threaded for simplicity, can do parallel error checking in the
   future


 Modes

   -

   run mode
   -

  default mode
  -

  start by opening the command and error channels, wait for ready
  -

  main loop
  -

 read a line
 -

 eliminate “;” comment lines, process executor commands
 -

 feed the rest as mdi commands
 -

 wait_complete
 -

 check for error
 -

errors messages sent back on stderr
 -

  exit on M1/M30
   -

   debug mode
   -

  add a prompt response after each command
  -

 Maybe use “>” for good response, “@” for error as default
 -

 errors and prompts on stdout
 -

 executor commands produce different prompts

Executor commands

   -

   mode
   -

  1 arg: run/debug
   -

   status
   -

  arg: list of keywords
  -

 example: current_position, current_velocity
  -

  validate list of keywords
  -

 error if unknown
  -

  return each keyword and value(s) one per line in list order
  -

 unless someone objects, these will be sent in json format
  -

   timeout
   -

  1 arg: integer seconds
   -

   prompts
   -

  args: list of keyword=x where x is a single character
  -

 example exec_error=&
  -

   exit
   -

  no arg


-- 
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FINsix IT
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650.279.7017 m
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Re: [Emc-users] looking for inexpensive modular encoder

[Jon Elson]

On 07/14/2015 11:59 AM, Dave Cole wrote:
> I'm not actually answering your question; but have you looked at the
> shaft encoders on Ebay recently?
> There were some $15 units the last time I looked.  It might make sense
> to adapt to some of those?
>
> $43 seems like a lot of money for the modular units considering what is
> delivered.
>
I can't use eBay items in a product I sell on my web site.

What I'm looking for is a 1000 cycle/rev encoder with index 
that fits on a 1/4" motor shaft.  For some odd reason, the 
Avago part cannot be had in 1000 cycle/rev with the 1/4" 
shaft, although a number of other resolutions are available.
Renco and US Digital used to have such items, but they are 
now over $74 each.

CUI is definitely cheaper, but has a few features I don't like.

Jon

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[Emc-users] FW: Okuma Absolute Encoder

[Chris Morley]

From: chrisinnana...@hotmail.com
To: emc-users@lists.sourceforge.net
Subject: RE: [Emc-users] Okuma Absolute Encoder
Date: Wed, 15 Jul 2015 01:21:13 +






> Date: Tue, 14 Jul 2015 09:48:00 -0500
> From: tensait...@gmail.com
> To: emc-users@lists.sourceforge.net
> Subject: [Emc-users] Okuma Absolute Encoder
> 
> I'm getting ready to start retrofitting a 1981 Okuma LC30 (OSP-3000
> control).
> 
> The axis drives seem to take simple +/-10V commands and use tachs on the
> motors for feedback.
> 
> However, from what I can tell, the encoders are some sort of absolute setup
> that doesn't use any sort of battery backup and have about 18 wires. There
> are also no limit or home switches.
> 
> I have no diagrams or documentation on anything for this machine. The
> encoders have no visible markings (one looks like it used to, but is worn
> off) except for one that simply says "D6."
> 
> Does anyone know anything about the pinout on these things or if there is
> any hope of using them?
> 
> -Chris Kelley

I have an Okuma flat bed lathe I have converted to linuxcnc (not fully finished 
but works).
I replaced the drives and motors.
I have the manuals for it - OSP2200
I have a pic of the page that shows pinouts.
not much info there.
I sent one encoder to Stuart Stevenson as they were interested in trying one.
Not sure if they ever got it working.

If you figure it out I'd love to hear about it.

Chris M

  
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Re: [Emc-users] Just In Case, Fanuc MPG

[Kirk Wallace]

On 07/14/2015 10:43 AM, Gene Heskett wrote:
> On Tuesday 14 July 2015 10:49:08 Kirk Wallace wrote:
>> On 07/14/2015 04:02 AM, Gene Heskett wrote:
>>
>> ... snip

>> well. All the MPGs had a generous application of a messy black grease.
>> I'm guessing it's some type of molybdenum grease.
>
> I am in concurrence on that, and I would probably dip into a small jar of
> barrel treatment grease for its replacement.  Do you need some?

I inherited a variety of lubricants from my Dad that I've had on the 
shelf for decades. There is a bucket of moly grease there that I will 
likely pass on to someone else.

... snip

>> center section is 3mm dia. and the pins 1.8mm. If it doesn't work out,
>> I know a guy that can make more ( :) ).
>
> Oh, who might that be except for yourself?  Does he work cheap enough?
> 

I have a crew; me, myself, and I

> Can you get drill rod that size?  And how wide is the roller section?

I haven't measured it yet, but it's probably close to 2mm wide with each 
pin at 2mm each. I suspect I'll be turning 90% of the stock into chips. 
The roller is already in the piece of stock, I just need to get rid or 
the unneeded bits.


-- 
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http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/

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Re: [Emc-users] encoder opto update

[Gene Heskett]

OPto/encoder update.

I had to customize a bit on the sleeve to get enough room so I could tap 
it around and get something resembling concentricity.  Made a new disk 
with a deeper slice for the index gate, and smaller mounting holes so 
the heads of the 0-80 flat head mounting screws wouldn't pull thru,  got 
it mounted & adjusted to run true +- a thou, then finished up the point 
to point of the 2 board encoder optics.  Good solid logic signals are 
being received now.  But I was done, so it is not yet mounted.  
Tomorrow's project.

Cheers, Gene Heskett
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Re: [Emc-users] Just In Case, Fanuc MPG

[Gene Heskett]

On Tuesday 14 July 2015 10:49:08 Kirk Wallace wrote:
> On 07/14/2015 04:02 AM, Gene Heskett wrote:
>
> ... snip
>
> > Interesting Kirk.  Does that roller actually roll?
>
> On the good units the roller rolls well. The pins and the center
> section are round and smooth. The bad roller has gone from round to a
> gear thoothed shape all the way around. The "tooth" pitch mismatch
> causes a double detent which allows the MPG wheel to stop in an
> unstable, signal wise, position between marks so can be a bit
> annoying. When adjusted, the good units seek and center the marks
> well. All the MPGs had a generous application of a messy black grease.
> I'm guessing it's some type of molybdenum grease.

I am in concurrence on that, and I would probably dip into a small jar of 
barrel treatment grease for its replacement.  Do you need some?

> > If all that wear is on just the side we can see, it apparently
> > wasn't rolling.  Critical lubricant needed on the axle pins?  I
> > don't see any plain evidence of wear either on the pins or the
> > socket where it lives. IMO there should be at least a polished
> > mark/area on the axle & holder.
> >
> > OTOH, if its worn like a 3 or 4 tooth gear, I'd wonder if the
> > passing teeth on the detent disk were a perfect mathematical fit,
> > meaning 1 full turn of the roller, for either 3 or 4 teeth passing
> > on the detent wheel. When making a new roller, I'd try to have its
> > diameter 3.5 linear teeth or 4.5, so the wear would be more evenly
> > distributed in the future. Having an even fit, it would not take a
> > lot of wear to assure it remained sync locked.
> >
> > In any event, thats a huge amount of wear. Not a normal looking wear
> > pattern at all.
>
> Two MPGs are dated 1982 and the bad one 1985 so I suppose they have a
> right to be worn. The plan is to use some drill rod to reproduce some
> new pins and leave them unhardened. That way the cheap part, the
> roller, will wear out, and not the detent disk or roller carrier. The
> center section is 3mm dia. and the pins 1.8mm. If it doesn't work out,
> I know a guy that can make more ( :) ).

Oh, who might that be except for yourself?  Does he work cheap enough?


Can you get drill rod that size?  And how wide is the roller section? I'd 
almost be tempted to see about making it out of soft A2 tool steel too 
but brass might be less wear on the disk.  If A2. OD polished to a 
mirror so it would not chew up the disk too fast. A stick of "DICO 
Stainless" on the buffing wheel should do that.

That could be fun making another of those. Quite similar to the encoder 
wheel I have under construction & should be done or close to it when I 
next get to the shop.  Right now I'm inside where its air conditioned 
because its 86F and at least 98% humidity under the umbrella on the 
shops front deck.  No precip yet, but heavy stuff forecast after 17:00 
local.

Cheers, Gene Heskett
-- 
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-Ed Howdershelt (Author)
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Re: [Emc-users] looking for inexpensive modular encoder

[Dave Cole]

I'm not actually answering your question; but have you looked at the 
shaft encoders on Ebay recently?
There were some $15 units the last time I looked.  It might make sense 
to adapt to some of those?

$43 seems like a lot of money for the modular units considering what is 
delivered.

Dave

On 7/14/2015 12:37 PM, Jon Elson wrote:
> hello, all,
>
> I've been selling some Automation tech brushless DC motors
> with encoders to go with my servo amps.  Lately I've been
> using HEDS-5640#A06 encoders from Avnet, which are the
> highest resolution I can get with a 1/4" shaft.  There used
> to be inexpensive alternates from US Digital and Renco, but
> these are now MORE expensive than the Avago HEDS units.  I
> know about the CUI AMT series, but have a few quibbles about
> them due to mechanical fit and acceleration lag.
>
> Does anybody know of another source of these modular
> encoders that are less than $43 in small quantity?  I might
> not even mind buying on Ali baba if somebody has a seller
> that supplies a good part with good service.
>
> When I say modular encoder, I'm thinking of a unit that has
> a plastic plate that is mounted to the motor end plate, then
> the encoder slides onto the motor shaft and snaps onto the
> plate, and the encoder disc is secured with a tiny hex wrench.
>
> Thanks for any pointers,
>
> Jon
>
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[Emc-users] looking for inexpensive modular encoder

[Jon Elson]

hello, all,

I've been selling some Automation tech brushless DC motors 
with encoders to go with my servo amps.  Lately I've been 
using HEDS-5640#A06 encoders from Avnet, which are the 
highest resolution I can get with a 1/4" shaft.  There used 
to be inexpensive alternates from US Digital and Renco, but 
these are now MORE expensive than the Avago HEDS units.  I 
know about the CUI AMT series, but have a few quibbles about 
them due to mechanical fit and acceleration lag.

Does anybody know of another source of these modular 
encoders that are less than $43 in small quantity?  I might 
not even mind buying on Ali baba if somebody has a seller 
that supplies a good part with good service.

When I say modular encoder, I'm thinking of a unit that has 
a plastic plate that is mounted to the motor end plate, then 
the encoder slides onto the motor shaft and snaps onto the 
plate, and the encoder disc is secured with a tiny hex wrench.

Thanks for any pointers,

Jon

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Re: [Emc-users] Okuma Absolute Encoder

[Peter C. Wallace]

On Tue, 14 Jul 2015, Chris Kelley wrote:

> Date: Tue, 14 Jul 2015 09:48:00 -0500
> From: Chris Kelley 
> Reply-To: "Enhanced Machine Controller (EMC)"
> 
> To: "Enhanced Machine Controller (EMC)" 
> Subject: [Emc-users] Okuma Absolute Encoder
> 
> I'm getting ready to start retrofitting a 1981 Okuma LC30 (OSP-3000
> control).
>
> The axis drives seem to take simple +/-10V commands and use tachs on the
> motors for feedback.
>
> However, from what I can tell, the encoders are some sort of absolute setup
> that doesn't use any sort of battery backup and have about 18 wires. There
> are also no limit or home switches.
>
> I have no diagrams or documentation on anything for this machine. The
> encoders have no visible markings (one looks like it used to, but is worn
> off) except for one that simply says "D6."
>
> Does anyone know anything about the pinout on these things or if there is
> any hope of using them?
>
> -Chris Kelley


I think that they are basically straight parallel absolute encoders, some have 
a byte/word select signal to reduce the number of wires

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Peter Wallace
Mesa Electronics

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[Emc-users] Okuma Absolute Encoder

[Chris Kelley]

I'm getting ready to start retrofitting a 1981 Okuma LC30 (OSP-3000
control).

The axis drives seem to take simple +/-10V commands and use tachs on the
motors for feedback.

However, from what I can tell, the encoders are some sort of absolute setup
that doesn't use any sort of battery backup and have about 18 wires. There
are also no limit or home switches.

I have no diagrams or documentation on anything for this machine. The
encoders have no visible markings (one looks like it used to, but is worn
off) except for one that simply says "D6."

Does anyone know anything about the pinout on these things or if there is
any hope of using them?

-Chris Kelley
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Re: [Emc-users] Just In Case, Fanuc MPG

[Kirk Wallace]

On 07/14/2015 04:02 AM, Gene Heskett wrote:

... snip

> Interesting Kirk.  Does that roller actually roll?

On the good units the roller rolls well. The pins and the center section 
are round and smooth. The bad roller has gone from round to a gear 
thoothed shape all the way around. The "tooth" pitch mismatch causes a 
double detent which allows the MPG wheel to stop in an unstable, signal 
wise, position between marks so can be a bit annoying. When adjusted, 
the good units seek and center the marks well. All the MPGs had a 
generous application of a messy black grease. I'm guessing it's some 
type of molybdenum grease.

> If all that wear is on just the side we can see, it apparently wasn't
> rolling.  Critical lubricant needed on the axle pins?  I don't see
> any plain evidence of wear either on the pins or the socket where it
> lives. IMO there should be at least a polished mark/area on the axle
> & holder.
>
> OTOH, if its worn like a 3 or 4 tooth gear, I'd wonder if the
> passing teeth on the detent disk were a perfect mathematical fit,
> meaning 1 full turn of the roller, for either 3 or 4 teeth passing on
> the detent wheel. When making a new roller, I'd try to have its
> diameter 3.5 linear teeth or 4.5, so the wear would be more evenly
> distributed in the future. Having an even fit, it would not take a
> lot of wear to assure it remained sync locked.
>
> In any event, thats a huge amount of wear. Not a normal looking wear
> pattern at all.

Two MPGs are dated 1982 and the bad one 1985 so I suppose they have a 
right to be worn. The plan is to use some drill rod to reproduce some 
new pins and leave them unhardened. That way the cheap part, the roller, 
will wear out, and not the detent disk or roller carrier. The center 
section is 3mm dia. and the pins 1.8mm. If it doesn't work out, I know a 
guy that can make more ( :) ).



-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/

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Re: [Emc-users] encoder opto update

[Gene Heskett]

On Saturday 11 July 2015 11:15:15 Gene Heskett wrote:
> On Tuesday 07 July 2015 11:18:16 Gene Heskett wrote:
> [and snipped]
>
> Since I wasn't able to make brass standoffs that held the disk
> straight, I decided to make a spacer sleeve.  Which with company was
> slow getting started, but I think I know where its hiding in a block
> of alu in the lathes chuck ATM.

I finally got it to a test fit state yesterday, But it runs about 15 thou 
eccentric. So my initital thought was to bore out the 3.5mm holes for 
the two 3mm mounting screws so they had additional wiggle room, but this 
has to be done very carefully else I'll have a 2 piece sleeve. It is 
also possible the return spring holder which isn't that well machined, 
is running eccentric and my inner bore of the sleeve needs to be opened 
up 10 thou or so to give it room to be centered.  So I'll check that too 
as I don't have enough alu wall to do both.

This, and the wet weather is turning into a PITA. I mowed a week ago, and 
its turning into machette territory in the back yard already.  With 
flash flood watches for the area issued allready.

Cheers, Gene Heskett
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-Ed Howdershelt (Author)
Genes Web page 

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Re: [Emc-users] Just In Case, Fanuc MPG

[Gene Heskett]

On Monday 13 July 2015 18:55:46 Kirk Wallace wrote:
> On 07/09/2015 07:53 AM, Eric Keller wrote:
> > On Wed, Jul 8, 2015 at 12:25 PM, Kirk Wallace
> > 
> >
> > wrote:
> >> In case it might be of interest, I posted some pictures of a Fanuc
> >> MPG I got from eBay:
> >
> > Kirk, thanks for posting this.  I've always wondered how they got
> > the detents to work
>
> One of the three MPGs had flaky detents, so I took it apart. There are
> pictures at the bottom of this page here:
> http://www.wallacecompany.com/machine_shop/fanuc_mpg/fanuc_mpg_index.h
>tml

Interesting Kirk.  Does that roller actually roll?  If all that wear is 
on just the side we can see, it apparently wasn't rolling.  Critical 
lubricant needed on the axle pins?  I don't see any plain evidence of 
wear either on the pins or the socket where it lives. IMO there should 
be at least a polished mark/area on the axle & holder.

OTOH, if its worn like a 3 or 4 tooth gear, I'd wonder if the passing 
teeth on the detent disk were a perfect mathematical fit, meaning 1 full 
turn of the roller, for either 3 or 4 teeth passing on the detent wheel. 
When making a new roller, I'd try to have its diameter 3.5 linear teeth 
or 4.5, so the wear would be more evenly distributed in the future.
Having an even fit, it would not take a lot of wear to assure it remained 
sync locked.

In any event, thats a huge amount of wear. Not a normal looking wear 
pattern at all.


> I made a Glade VCP application for testing with a PC parallel port:
> http://www.wallacecompany.com/machine_shop/fanuc_mpg/gvcpMPG/Screensho
>t-gvcpMPG-1a.png
>
> http://www.wallacecompany.com/machine_shop/fanuc_mpg/gvcpMPG/

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] Index pulse on 5i25 with 7i76

[David Armstrong]

dont forget you also need a pulse on enc a as well as index for threading ,
unless of course your using a commercial encoder
and change encoder type to 1 , and change the encoder to ttl by the 3
jumpers on the 7i76 for that particular channel . you can tie the same sig
to index and enc a

hope everones OK , i';m back



On 6 July 2015 at 22:01, Tom Easterday  wrote:

> Ah, I found this thread which explains Chris’ message and that we are not
> the only ones who have this issue…
>
> http://www.linuxcnc.org/index.php/english/forum/38-general-linuxcnc-questions/29281-threading-g76-with-spindle-in-reverse
> <
> http://www.linuxcnc.org/index.php/english/forum/38-general-linuxcnc-questions/29281-threading-g76-with-spindle-in-reverse
> >
>
> > On Jul 5, 2015, at 12:34 PM, Chris Radek  wrote:
> >
> > On Sun, Jul 05, 2015 at 12:17:32PM -0400, Tom Easterday wrote:
> >>
> >> opposite direction in the turret and I use M3, and this is the
> >> tool that I was using when G76 fails.  Could the spindle direction
> >> effect the index pulse?
> >
> > When in M3, the motion.spindle-revs should increase by 1.0 for each
> > turn of the spindle.  When in M4, it should decrease.
> >
> >
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