Re: [Emc-developers] nother Q for Peter C.W.

[Gene Heskett]

On Saturday 07 March 2020 14:08:27 Gene Heskett wrote:

> On Saturday 07 March 2020 13:26:00 Jon Elson wrote:
> > On 03/06/2020 11:13 PM, Gene Heskett wrote:
> > > That cross patterned face is then a target to be machined
> > > into the mount to locate it more precisely?
> >
> > Maybe, or just a place for epoxy to bond to.  That face with
> > the cross indentation is where the bias magnet is,
> > The flat face nearest the leads is where the actual sensor
> > chip is.
> >
> > > I'm in the house but I now seem to recall that its the
> > > smooth side that's facing the gear in the lathe.
> >
> > Yes, that's the only way it would work.
> >
> > > Duh. It takes a 16mm projector lens and damned strong
> > > light to read the text printed on the "branded face". What
> > > the hell were they thinking? You're saying that the
> > > depressed cross in the 5% smaller face is not the sensed face?
> >
> > Yes.
> >
> > > That the crossed pattern should be the face glued to the
> > > mount?
> >
> > Yes.
> >
> > > In that event I also have them wired reversed polarity.
> > > Which shouldn't hurt them as they are rated for up to 18
> > > volts of reversed voltage.
> >
> > Oh, that will make it even less likely to sense anything.
>
> Which with a reversed 5 volt supply doubly guarantees it won't work.
>
> Since it also has a half mic tantalum cap across the power pins, which
> was the ony thing being powered at its native polarity, so I'm
> starting from scratch since the pin half of the plug ejected the pin
> while unsoldering every thing else, so a new 3 pin socket is sitting
> in a thin puddle of jbweld in the toaster oven at around 145F to
> hasten the cure. After skimming off the die fins etc and washing it
> down with acetone for better adhesion of course. hour or so ought to
> stick it, then glue on another ATS667, put the heat on it for another
> hour and finish the wireing starting with tradeing ground and 5 volts
> on the cable coming to it.  And maybe I can test it yet today. If I
> don't screw it up again...

I think I'm good, I have seen it work, and the whole thing is sitting in 
a puddle of jbweld with a piece of plastic tape for a spacer between it 
and the nail glued on the side of the drawbar cap. with a heater set on 
low and doing half the garage heating about 3" away.  Not too hot but 
should get the stuff cured by noonish tomorrow. Not plugged in ATM so 
theres no cable pulling on it, only the bias magnet pulling it toward 
the nail. If it does pull it, the tape will stop it leaving a useable 
air gap. So far, so good, I might even have a 2nd near beer to 
celebrate!

And I've found a good use for that toaster even I tried to anneal those 
tapered brass gib strips I put in TLM 3 or 4 years ago, set on 150, and 
on forever, it sets up jbweld in about 2 hours. Set on 450, it does a 
fair job on frozen french fries for the missus when she gets a hankerin 
for them. I might sample one or two but as a diabetic, they've not been 
on my menu for years.
>
> One thing is for sure though, I can't net the command-deriv to
> joint-vel, its instant following error. Joint never moves, but will
> move in that direction at a good clip after being reset and
> re-enabled, so its the backlash move that triggers it. the following
> error occurs when an axis is reversed. But thats a different problem
> for another day and thread.
>
> > Jon
> >
> >
> > ___
> > Emc-developers mailing list
> > Emc-developers@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-developers
>
> Cheers, Gene Heskett


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

Re: [Emc-developers] nother Q for Peter C.W.

[Gene Heskett]

On Saturday 07 March 2020 13:26:00 Jon Elson wrote:

> On 03/06/2020 11:13 PM, Gene Heskett wrote:
> > That cross patterned face is then a target to be machined
> > into the mount to locate it more precisely?
>
> Maybe, or just a place for epoxy to bond to.  That face with
> the cross indentation is where the bias magnet is,
> The flat face nearest the leads is where the actual sensor
> chip is.
>
> > I'm in the house but I now seem to recall that its the
> > smooth side that's facing the gear in the lathe.
>
> Yes, that's the only way it would work.
>
> > Duh. It takes a 16mm projector lens and damned strong
> > light to read the text printed on the "branded face". What
> > the hell were they thinking? You're saying that the
> > depressed cross in the 5% smaller face is not the sensed face?
>
> Yes.
>
> > That the crossed pattern should be the face glued to the
> > mount?
>
> Yes.
>
> > In that event I also have them wired reversed polarity.
> > Which shouldn't hurt them as they are rated for up to 18
> > volts of reversed voltage.
>
> Oh, that will make it even less likely to sense anything.

Which with a reversed 5 volt supply doubly guarantees it won't work.

Since it also has a half mic tantalum cap across the power pins, which 
was the ony thing being powered at its native polarity, so I'm starting 
from scratch since the pin half of the plug ejected the pin while 
unsoldering every thing else, so a new 3 pin socket is sitting in a thin 
puddle of jbweld in the toaster oven at around 145F to hasten the cure.  
After skimming off the die fins etc and washing it down with acetone for 
better adhesion of course. hour or so ought to stick it, then glue on 
another ATS667, put the heat on it for another hour and finish the 
wireing starting with tradeing ground and 5 volts on the cable coming to 
it.  And maybe I can test it yet today. If I don't screw it up again...

One thing is for sure though, I can't net the command-deriv to joint-vel, 
its instant following error. Joint never moves, but will move in that 
direction at a good clip after being reset and re-enabled, so its the 
backlash move that triggers it. the following error occurs when an axis 
is reversed. But thats a different problem for another day and thread.

> Jon
>
>
> ___
> Emc-developers mailing list
> Emc-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-developers


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

Re: [Emc-developers] nother Q for Peter C.W.

[Jon Elson]

On 03/06/2020 11:13 PM, Gene Heskett wrote:
That cross patterned face is then a target to be machined 
into the mount to locate it more precisely?
Maybe, or just a place for epoxy to bond to.  That face with 
the cross indentation is where the bias magnet is,
The flat face nearest the leads is where the actual sensor 
chip is.
I'm in the house but I now seem to recall that its the 
smooth side that's facing the gear in the lathe.

Yes, that's the only way it would work.
Duh. It takes a 16mm projector lens and damned strong 
light to read the text printed on the "branded face". What 
the hell were they thinking? You're saying that the 
depressed cross in the 5% smaller face is not the sensed face?

Yes.
That the crossed pattern should be the face glued to the 
mount?

Yes.
In that event I also have them wired reversed polarity. 
Which shouldn't hurt them as they are rated for up to 18 
volts of reversed voltage.

Oh, that will make it even less likely to sense anything.

Jon


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

Re: [Emc-developers] nother Q for Peter C.W.

[Gene Heskett]

On Saturday 07 March 2020 10:30:26 Peter C. Wallace wrote:

> On Sat, 7 Mar 2020, Gene Heskett wrote:
> > Date: Sat, 7 Mar 2020 07:06:41 -0500
> > From: Gene Heskett 
> > Reply-To: EMC developers 
> > To: emc-developers@lists.sourceforge.net
> > Subject: Re: [Emc-developers] nother Q for  Peter C.W.

[...]

> The encoder index is edge triggered but index is only used in one
> direction (and at a constant speed) at the beginning of every peck
> cycle so the index width is unimportant.

Thats exactly what I wanted to hear, Peter. So any attempts to tighten up 
my peck tapped holes should begin with fine adjustments to the backlash 
setting so theres no pull or push on the tap when backing out.

My method of setting that is probably pretty crude and is set for a tad 
over .001" atm. And I have had to dis the head to gain access to the z 
nuts locking bolts, which due to the design, are best described as 
tightened to about 1/16th of a turn past stretching them permanently.  
At some point I'll probably have to drill and tap for bigger bolts, that 
pair of 6mm's are definitely not quite up to the task IMNSHO. Shoulda 
been 8mm's, or a quad pattern of 6mm's. That however may have taken out 
so must cast as to break out the bottom of the socket in the back of the 
sled, which was not big enough for the foot of the nut bracket and I had 
to take the sled to the little hf mill and widen it vertically about 
1/8" before it fit.  The guy who sold me the kit offered to send me a 
nut bracket made out of thinner stock but I turned him down as my way 
was stronger. But it only took 2 weeks to work loose the first time as I 
hand tightened them the first time. I tightened them with a torque 
wrench so I could see them beginning to stretch the next time, and they 
seem to be holding ok now. Definitely a weak point in CNCing a G0704.

The other fuss is loseing a fat inch of Y motion. That hurts, a lot! A 
few thou over 5.5" simply is not enough, the front motor mount 
interferes with fwd motion long before the spindle has reached the rear 
of the table. Both that motor mount and the screw could be an inch 
longer.

> Peter Wallace
> Mesa Electronics
>
>
>
> ___
> Emc-developers mailing list
> Emc-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-developers


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 <http://geneslinuxbox.net:6309/gene>


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

Re: [Emc-developers] nother Q for Peter C.W.

[Peter C. Wallace]

On Sat, 7 Mar 2020, Gene Heskett wrote:


Date: Sat, 7 Mar 2020 07:06:41 -0500
From: Gene Heskett 
Reply-To: EMC developers 
To: emc-developers@lists.sourceforge.net
Subject: Re: [Emc-developers] nother Q for  Peter C.W.

On Saturday 07 March 2020 00:13:38 Gene Heskett wrote:


On Friday 06 March 2020 21:50:15 Jon Elson wrote:

On 03/06/2020 05:38 PM, Gene Heskett wrote:

I have now put 2 ATD667LSG's on this block and have failed to get
a working index pulse into linuxcnc thru the encoder index pin of
a 7i76D.


Note these sensors are open-collector, so need a pull-up
resistor.


I've mounted it branded face against a block of alu, with a green
3 pin socket to allow unplugging it quickly, and I jbwelded a
piece of a nail to the side of the drawbar cap/bolt retainer at
the top of the spindle, but I can't get a false out of it at any
orientation of the nail or a tool waved past it.


The sensor is on the end where the leads come out of the
package, but at right angles to the
leads.  That's the "branded face".  So, it sounds like you
have them mounted backwards.


That cross patterned face is then a target to be machined into the
mount to locate it more precisely?  I'm in the house but I now seem to
recall that its the smooth side that's facing the gear in the lathe.
Duh. It takes a 16mm projector lens and damned strong light to read
the text printed on the "branded face". What the hell were they
thinking?

You're saying that the depressed cross in the 5% smaller face is not
the sensed face? That the crossed pattern should be the face glued to
the mount? In that event I also have them wired reversed polarity.
Which shouldn't hurt them as they are rated for up to 18 volts of
reversed voltage. But by now, I'll have to do some chisel work to
remove and likely wreck a 2nd one.  Sigh. This is what they mean when
they say an education costs money... I only bought 6, paying about $2
more from digikey because all the $6 ebay ones were in the middle of
the virus in china and 6 weeks away.

Thats also an excellent example of a piss-poor 14 page document they
supply. That cross grooved face is much easier to identify. And mount
to the smooth face, the jbweld oozing out can also cause lead shorts
much easier.


The gear tooth needs to wipe sideways across the sensor to
be registered.  So, a gear
tooth that is parallel to the leads will be sensed as it
wipes across the face of the sensor.


Or in this case, 1/2" of a 2" nail, jbwelded to the outside of the
drawbar retainer cap which will swipe across the smooth face as the
spindle rotates.

Now I am pissed at me.


Motion of the tooth will be at right angles to the leads.

Check if the sensor +5 V is drawing any current (should be
about 7 mA).  Are you sure you have not
connected to the "test" output (pin 3)?  They don't say what
this pin does, just tell you "tie to ground or
leave open".


Which I've always clipped off...


Jon


Thank you Jon.


Now, it looks to me that the only non-ambiguous drawing in that whole
document is the one on the lower left on page 8.

But read the text. It seems to me that the rotation reversal is going to
diddle the vertical positioning if there is any encoder counter reset
allowed while the locked condition is in effect. It doesn't give me any
confidence that the vertical positioning will be error free at all.
What I do know for sure is that if because the tap is too big to pull in
one g33.1 pass due to lack of motor power and I have close to 2hp I can
surge it to, and I write the rigid tap routine to peck the operation by
driveing the tap only 1/4 to 1/2 a turn per "Peck" until the depth has
been obtained, that the repeated passes give me an obviously loose fit
to a bolt, which I have until now blamed on a backlash take-up error.

What I haven't done is played with the backlash to see if the somewhat
sloppy thread obtained by peck tapping can be improved. But I also don't
know if a counter reset is done anyplace but at the instant the
down-stroke is started. But that text tends to tell me that since the
pulse polarity depends on the rotational direction, then the phasing
relationship is going to be diddled by quite a few counts at the bottom
of the hole when the turnaround and backout move is begun.

How can one determine if thats the case?

Its going to be very hard to see on the halscope unless a 50 u-s base
thread just to run the halscope is setup, something I don't have now.
This is, I think. probably in the 5i25 firmware and I'm not qualified to
troll thru that. I can't even imagine how that might be alleviated, even
by an automatic edge detector. Even if the polarity is reversed with the
direction of rotation, it has to be reset probably several counts ahead
of the true zero point as the nail crosses over the hall effects gap,
before it can send that edge again on the next rotation. So

Re: [Emc-developers] nother Q for Peter C.W.

[Gene Heskett]

On Saturday 07 March 2020 00:13:38 Gene Heskett wrote:

> On Friday 06 March 2020 21:50:15 Jon Elson wrote:
> > On 03/06/2020 05:38 PM, Gene Heskett wrote:
> > > I have now put 2 ATD667LSG's on this block and have failed to get
> > > a working index pulse into linuxcnc thru the encoder index pin of
> > > a 7i76D.
> >
> > Note these sensors are open-collector, so need a pull-up
> > resistor.
> >
> > > I've mounted it branded face against a block of alu, with a green
> > > 3 pin socket to allow unplugging it quickly, and I jbwelded a
> > > piece of a nail to the side of the drawbar cap/bolt retainer at
> > > the top of the spindle, but I can't get a false out of it at any
> > > orientation of the nail or a tool waved past it.
> >
> > The sensor is on the end where the leads come out of the
> > package, but at right angles to the
> > leads.  That's the "branded face".  So, it sounds like you
> > have them mounted backwards.
>
> That cross patterned face is then a target to be machined into the
> mount to locate it more precisely?  I'm in the house but I now seem to
> recall that its the smooth side that's facing the gear in the lathe.
> Duh. It takes a 16mm projector lens and damned strong light to read
> the text printed on the "branded face". What the hell were they
> thinking?
>
> You're saying that the depressed cross in the 5% smaller face is not
> the sensed face? That the crossed pattern should be the face glued to
> the mount? In that event I also have them wired reversed polarity. 
> Which shouldn't hurt them as they are rated for up to 18 volts of
> reversed voltage. But by now, I'll have to do some chisel work to
> remove and likely wreck a 2nd one.  Sigh. This is what they mean when
> they say an education costs money... I only bought 6, paying about $2
> more from digikey because all the $6 ebay ones were in the middle of
> the virus in china and 6 weeks away.
>
> Thats also an excellent example of a piss-poor 14 page document they
> supply. That cross grooved face is much easier to identify. And mount
> to the smooth face, the jbweld oozing out can also cause lead shorts
> much easier.
>
> > The gear tooth needs to wipe sideways across the sensor to
> > be registered.  So, a gear
> > tooth that is parallel to the leads will be sensed as it
> > wipes across the face of the sensor.
>
> Or in this case, 1/2" of a 2" nail, jbwelded to the outside of the
> drawbar retainer cap which will swipe across the smooth face as the
> spindle rotates.
>
> Now I am pissed at me.
>
> > Motion of the tooth will be at right angles to the leads.
> >
> > Check if the sensor +5 V is drawing any current (should be
> > about 7 mA).  Are you sure you have not
> > connected to the "test" output (pin 3)?  They don't say what
> > this pin does, just tell you "tie to ground or
> > leave open".
>
> Which I've always clipped off...
>
> > Jon
>
> Thank you Jon.
>
Now, it looks to me that the only non-ambiguous drawing in that whole 
document is the one on the lower left on page 8.

But read the text. It seems to me that the rotation reversal is going to 
diddle the vertical positioning if there is any encoder counter reset 
allowed while the locked condition is in effect. It doesn't give me any 
confidence that the vertical positioning will be error free at all.  
What I do know for sure is that if because the tap is too big to pull in 
one g33.1 pass due to lack of motor power and I have close to 2hp I can 
surge it to, and I write the rigid tap routine to peck the operation by 
driveing the tap only 1/4 to 1/2 a turn per "Peck" until the depth has 
been obtained, that the repeated passes give me an obviously loose fit 
to a bolt, which I have until now blamed on a backlash take-up error.

What I haven't done is played with the backlash to see if the somewhat 
sloppy thread obtained by peck tapping can be improved. But I also don't 
know if a counter reset is done anyplace but at the instant the 
down-stroke is started. But that text tends to tell me that since the 
pulse polarity depends on the rotational direction, then the phasing 
relationship is going to be diddled by quite a few counts at the bottom 
of the hole when the turnaround and backout move is begun.

How can one determine if thats the case?

Its going to be very hard to see on the halscope unless a 50 u-s base 
thread just to run the halscope is setup, something I don't have now. 
This is, I think. probably in the 5i25 firmware and I'm not qualified to 
troll thru that. I can't even imagine how that might be alleviated, even 
by an automatic edge detector. Even if the polarity is reversed with the 
direction of rotation, it has to be reset probably several counts ahead 
of the true zero point as the nail crosses over the hall effects gap, 
before it can send that edge again on the next rotation. So which edge 
do we use to get the least error? Seems to me the first edge should be 
ignored because that would be the reset edge to be thrown away. Given 
that my en

Re: [Emc-developers] nother Q for Peter C.W.

[Gene Heskett]

On Friday 06 March 2020 21:50:15 Jon Elson wrote:

> On 03/06/2020 05:38 PM, Gene Heskett wrote:
> > I have now put 2 ATD667LSG's on this block and have failed to get a
> > working index pulse into linuxcnc thru the encoder index pin of a
> > 7i76D.
>
> Note these sensors are open-collector, so need a pull-up
> resistor.
>
> > I've mounted it branded face against a block of alu, with a green 3
> > pin socket to allow unplugging it quickly, and I jbwelded a piece of
> > a nail to the side of the drawbar cap/bolt retainer at the top of
> > the spindle, but I can't get a false out of it at any orientation of
> > the nail or a tool waved past it.
>
> The sensor is on the end where the leads come out of the
> package, but at right angles to the
> leads.  That's the "branded face".  So, it sounds like you
> have them mounted backwards.


That cross patterned face is then a target to be machined into the mount 
to locate it more precisely?  I'm in the house but I now seem to recall 
that its the smooth side that's facing the gear in the lathe. Duh. It 
takes a 16mm projector lens and damned strong light to read the text 
printed on the "branded face". What the hell were they thinking?  

You're saying that the depressed cross in the 5% smaller face is not the 
sensed face? That the crossed pattern should be the face glued to the 
mount? In that event I also have them wired reversed polarity.  Which 
shouldn't hurt them as they are rated for up to 18 volts of reversed 
voltage. But by now, I'll have to do some chisel work to remove and 
likely wreck a 2nd one.  Sigh. This is what they mean when they say an 
education costs money... I only bought 6, paying about $2 more from 
digikey because all the $6 ebay ones were in the middle of the virus in 
china and 6 weeks away.

Thats also an excellent example of a piss-poor 14 page document they 
supply. That cross grooved face is much easier to identify. And mount to 
the smooth face, the jbweld oozing out can also cause lead shorts much 
easier.

> The gear tooth needs to wipe sideways across the sensor to
> be registered.  So, a gear
> tooth that is parallel to the leads will be sensed as it
> wipes across the face of the sensor.
Or in this case, 1/2" of a 2" nail, jbwelded to the outside of the 
drawbar retainer cap which will swipe across the smooth face as the 
spindle rotates.

Now I am pissed at me.


> Motion of the tooth will be at right angles to the leads.
>
> Check if the sensor +5 V is drawing any current (should be
> about 7 mA).  Are you sure you have not
> connected to the "test" output (pin 3)?  They don't say what
> this pin does, just tell you "tie to ground or
> leave open".

Which I've always clipped off...

> Jon

Thank you Jon.
>
> ___
> Emc-developers mailing list
> Emc-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-developers


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

Re: [Emc-developers] nother Q for Peter C.W.

[Jon Elson]

On 03/06/2020 05:38 PM, Gene Heskett wrote:

I have now put 2 ATD667LSG's on this block and have failed to get a
working index pulse into linuxcnc thru the encoder index pin of a 7i76D.
Note these sensors are open-collector, so need a pull-up 
resistor.

I've mounted it branded face against a block of alu, with a green 3 pin
socket to allow unplugging it quickly, and I jbwelded a piece of a nail
to the side of the drawbar cap/bolt retainer at the top of the spindle,
but I can't get a false out of it at any orientation of the nail or a
tool waved past it.
The sensor is on the end where the leads come out of the 
package, but at right angles to the
leads.  That's the "branded face".  So, it sounds like you 
have them mounted backwards.
The gear tooth needs to wipe sideways across the sensor to 
be registered.  So, a gear
tooth that is parallel to the leads will be sensed as it 
wipes across the face of the sensor.

Motion of the tooth will be at right angles to the leads.

Check if the sensor +5 V is drawing any current (should be 
about 7 mA).  Are you sure you have not
connected to the "test" output (pin 3)?  They don't say what 
this pin does, just tell you "tie to ground or

leave open".

Jon


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

Re: [Emc-developers] nother Q for Peter C.W.

[Gene Heskett]

On Friday 06 March 2020 18:59:12 Peter C. Wallace wrote:

> On Fri, 6 Mar 2020, Gene Heskett wrote:
> > Date: Fri, 6 Mar 2020 18:38:53 -0500
> > From: Gene Heskett 
> > Reply-To: EMC developers 
> > To: emc-developers@lists.sourceforge.net
> > Subject: [Emc-developers] nother Q for  Peter C.W.
> >
> > I have now put 2 ATD667LSG's on this block and have failed to get a
> > working index pulse into linuxcnc thru the encoder index pin of a
> > 7i76D.
> >
> > I've mounted it branded face against a block of alu, with a green 3
> > pin socket to allow unplugging it quickly, and I jbwelded a piece of
> > a nail to the side of the drawbar cap/bolt retainer at the top of
> > the spindle, but I can't get a false out of it at any orientation of
> > the nail or a tool waved past it.
> >
> > I've tried 2 new ones now, and they  appear to be stuck high/true
> > when the connector is made up, but goes false about 1 second after
> > unplugging it. Attempting to measure the current gets a worst case
> > of about 1.2 u-amps to ground, and that is not enough to pull it
> > down to false unless the dvm is replaced by a short to ground and
> > shows zilch current to the 5 volts.
> >
> > Trying to measure input current by inserting the dvm between its
> > output and the encoder-index in looks like a small capacitor
> > charging, but drops to zero current in nominally 1 second and stays
> > there.
> >
> > W4-W5-W6 have been tried both ways, but to the left s/b ttl and
> > everything except the ATS667 is ttl.  Its supposed to be able to
> > sink 25 ma up to 70 ma with a 12 volt supply, but its only getting
> > 4.92 volts.
> >
> > 3 of them have been working on 5 volts on the lathe for going on 3
> > years. Worked fine till the goop went to hell because it dissolves
> > in 0-W20 synthetic spindle oil.
> >
> > I'm bumfuzzled.  Obviously I'm doing something wrong but what?
> >
> > 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-developers mailing list
> > Emc-developers@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-developers
>
> You can test the 7I76D index input in TTL mode by simply shorting it
> to ground. The encoder inputs have 2K pullups to 5V. You can read the
> index pin status in hal, for a 5I25/6I25 and a 7I76 (encoder 0) that
> pin would be:
>
> hm2_5i25.0.encoder.00.input-index
which is where I am checking it. A short to ground on that wire=false. 
The nominally 5 volts on the red wire is a solid 4.91 volts like it was 
solid copper all the way. Probably coming from the Dells 5 volts from a 
psu thats drifting low with age.

> I would check the ATS667 5V and GND connections, sounds like something
> is open

That was my first thought too.  But I can't find a finger to use as a 
divining rod.

> Peter Wallace
> Mesa Electronics
>
>
>
> ___
> Emc-developers mailing list
> Emc-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-developers


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

Re: [Emc-developers] nother Q for Peter C.W.

[Peter C. Wallace]

On Fri, 6 Mar 2020, Gene Heskett wrote:


Date: Fri, 6 Mar 2020 18:38:53 -0500
From: Gene Heskett 
Reply-To: EMC developers 
To: emc-developers@lists.sourceforge.net
Subject: [Emc-developers] nother Q for  Peter C.W.

I have now put 2 ATD667LSG's on this block and have failed to get a
working index pulse into linuxcnc thru the encoder index pin of a 7i76D.

I've mounted it branded face against a block of alu, with a green 3 pin
socket to allow unplugging it quickly, and I jbwelded a piece of a nail
to the side of the drawbar cap/bolt retainer at the top of the spindle,
but I can't get a false out of it at any orientation of the nail or a
tool waved past it.

I've tried 2 new ones now, and they  appear to be stuck high/true when
the connector is made up, but goes false about 1 second after unplugging
it. Attempting to measure the current gets a worst case of about 1.2
u-amps to ground, and that is not enough to pull it down to false unless
the dvm is replaced by a short to ground and shows zilch current to the
5 volts.

Trying to measure input current by inserting the dvm between its output
and the encoder-index in looks like a small capacitor charging, but
drops to zero current in nominally 1 second and stays there.

W4-W5-W6 have been tried both ways, but to the left s/b ttl and
everything except the ATS667 is ttl.  Its supposed to be able to sink 25
ma up to 70 ma with a 12 volt supply, but its only getting 4.92 volts.

3 of them have been working on 5 volts on the lathe for going on 3 years.
Worked fine till the goop went to hell because it dissolves in 0-W20
synthetic spindle oil.

I'm bumfuzzled.  Obviously I'm doing something wrong but what?

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





You can test the 7I76D index input in TTL mode by simply shorting it to ground.
The encoder inputs have 2K pullups to 5V. You can read the index pin status in 
hal, for a 5I25/6I25 and a 7I76 (encoder 0) that pin would be:


hm2_5i25.0.encoder.00.input-index

I would check the ATS667 5V and GND connections, sounds like something is open

Peter Wallace
Mesa Electronics



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