I can confirm that with the Mesa 7i33 card an open collector encoder will
work but needs pull-up resistors, I used 1k to pull up to 5V, for the
positive encoder inputs. For a 100ppr quadrature encoder that is so far
working fine.
With respect to the encoder Z pulse, if I had a Z pulse three times
Greets -
Is there a better explanation of the interaction of the ACCEL and
VELOCITY settings for Axis in its' INI file? We've been working on a
Puma arm which we used to have running on Copley amps in Torque mode
(and a MESA card performing PWM angle output), but have moved it over to
Gecko 320
On Tue, Nov 13, 2012, at 08:26 AM, Scott Hasse wrote:
>
> With respect to the encoder Z pulse, if I had a Z pulse three times per
> spindle revolution would a software solution to ignoring every two out of
> three be feasible? My spindle pulley is 75 teeth, and a 25 tooth encoder
> pulley woul
On 13 November 2012 13:49, Ted Hyde wrote:
> Is there a better explanation of the interaction of the ACCEL and
> VELOCITY settings for Axis in its' INI file? We've been working on a
> Puma arm
As I understand it, (and I may be wrong) the expected behaviour is:
In joint mode the individual joint
On Tuesday 13 November 2012 13:25:29 Scott Hasse did opine:
> I can confirm that with the Mesa 7i33 card an open collector encoder
> will work but needs pull-up resistors, I used 1k to pull up to 5V, for
> the positive encoder inputs. For a 100ppr quadrature encoder that is
> so far working fine.
On 13 November 2012 18:34, Gene Heskett wrote:
> I'd have reservations about index sensing at servo rate, depending on the
> top speed of the spindle, and try to set the mesa to respond in real time.
The Mesa encoder counter responds in Mesa time, and zeros the counts
instantly. The next time th
2012/11/13 Peter C. Wallace :
>
> It should be noted that this should be possible with any torque mode servo
> and some HAL magic.
Peter, could You, please, explain in little more detail, how do You intend that?
This machine has 4 servos, including Z axis, driven by 2 pieces of 7i39LV.
The way I
Hello!
I somehow had skipped the fact that encoders on servos have
differential signal output, but 7i39 cards expect single-ended signal.
Since that is plasma machine with all the noise from plasma, I do not
think that using only half of the differential signal is a good idea.
I was thinking that
On Tue, 13 Nov 2012, Viesturs L?cis wrote:
> Date: Tue, 13 Nov 2012 22:12:33 +0200
> From: "[UTF-8] Viesturs L?cis"
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users] Floating plasma torch - asking to share experience
>
>
2012/11/13 Peter C. Wallace :
>
> You can sense ferror or PID output (on a torque mode drive)
> on a voltage mode drive like the 7I39, ferror (and a slow move
> against a resiliant stop) is probably the best route for
> "switchless" limit sensing
Thank You!
I better will try to make a mount for to
On Tue, 13 Nov 2012, Viesturs L?cis wrote:
> Date: Tue, 13 Nov 2012 23:08:36 +0200
> From: "[UTF-8] Viesturs L?cis"
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: [Emc-users] Differential signal from encoders
>
> Hello!
>
> I somehow
2012/11/14 Peter C. Wallace :
>
> You can do the whole encoder interface with a 26LS32A chip (4 channel RS-422
> receiver)
Thank You, I did not know that such a chip exists with several channels in one.
I just checked - even our local electronics supply store have them in
stock (at least that is w
On 13 November 2012 22:28, Viesturs Lācis wrote:
>> (so you can set the encoder digital filter to reject HF
>> noise)
>
> Could You, please, explain, what does TTL signal has to do with high
> or low count rate?
With a high filter constant you can get away with some encoder noise,
but can't coun
On Wed, 14 Nov 2012, Viesturs L?cis wrote:
> Date: Wed, 14 Nov 2012 00:28:13 +0200
> From: "[UTF-8] Viesturs L?cis"
> Reply-To: "Enhanced Machine Controller (EMC)"
>
> To: "Enhanced Machine Controller (EMC)"
> Subject: Re: [Emc-users] Differential signal from encoders
>
> 2012/11/14 Peter
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 11/13/2012 4:28 PM, Viesturs Lācis wrote:
> 2012/11/14 Peter C. Wallace :
>>
>> You can do the whole encoder interface with a 26LS32A chip (4
>> channel RS-422 receiver)
>
> Thank You, I did not know that such a chip exists with several
> channels
On Tuesday 13 November 2012 17:38:24 Viesturs Lācis did opine:
> Hello!
>
> I somehow had skipped the fact that encoders on servos have
> differential signal output, but 7i39 cards expect single-ended signal.
> Since that is plasma machine with all the noise from plasma, I do not
> think that usi
Thank You, Andy and Charles!
2012/11/14 Peter C. Wallace :
>
> if these are indeed 1000 CPR (250 line) thats correct, but if they are 1000
> line encoders (4000 counts per rev) max count frequency would be 200 KHz
>
I do not get this one. The way I understand this is: each line on
encoder is one
2012/11/14 Gene Heskett :
>
> That is a good start. In view of the noise, I think I would add a quad of
> 1n914 type diodes, such that the noise can't rise too far above the 5volt
> line, or go too far below ground. Two with the cathode bands toward 5v,
> the anodes to A & B, and two more from a &
On Tuesday 13 November 2012 19:17:17 Viesturs Lācis did opine:
> 2012/11/14 Gene Heskett :
> > That is a good start. In view of the noise, I think I would add a quad
> > of 1n914 type diodes, such that the noise can't rise too far above
> > the 5volt line, or go too far below ground. Two with the
On 13 November 2012 23:09, Viesturs Lācis wrote:
> Where can I find out, how does the raw-write facility work?
http://www.linuxcnc.org/docs/html/man/man9/hostmot2.9.html
"Raw Mode"
If you set "debug modules" then the encoder filter register addresses
will be printed to dmesg.
(or look around fo
On Tue, 13 Nov 2012, Gene Heskett wrote:
Date: Tue, 13 Nov 2012 19:42:59 -0500
From: Gene Heskett
Reply-To: "Enhanced Machine Controller (EMC)"
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Differential signal from encoders
On Tuesday 13 November 2012 19:17:17 Viesturs L??c
On Tuesday 13 November 2012 21:54:03 Peter C. Wallace did opine:
> On Tue, 13 Nov 2012, Gene Heskett wrote:
> > Date: Tue, 13 Nov 2012 19:42:59 -0500
> > From: Gene Heskett
> > Reply-To: "Enhanced Machine Controller (EMC)"
> >
> >
> >
> > To: emc-users@lists.sourceforge.net
> > Subject: Re
Thanks all for the advice. I hadn't considered the case of reversing the
spindle a bit, that does shoot that idea down. Although I've enjoyed
Gene's spindle encoder adventures vicariously I don't think that's a path I
want to walk, so at this point my plan is to obtain a 1:1 timing belt
pulley an
I have been using
http://www.digikey.com/scripts/dksearch/dksus.dll?vendor=0&keywords=102-1787-ND
on more than just cui encoders.
sam
On 11/13/2012 06:51 PM, Peter C. Wallace wrote:
> On Tue, 13 Nov 2012, Gene Heskett wrote:
>
>> Date: Tue, 13 Nov 2012 19:42:59 -0500
>> From: Gene Heskett
>> Re
On Tuesday 13 November 2012 22:26:10 Scott Hasse did opine:
> Thanks all for the advice. I hadn't considered the case of reversing
> the spindle a bit, that does shoot that idea down. Although I've
> enjoyed Gene's spindle encoder adventures vicariously I don't think
> that's a path I want to wa
Viesturs Lācis wrote:
> Hello!
>
> I somehow had skipped the fact that encoders on servos have
> differential signal output, but 7i39 cards expect single-ended signal.
> Since that is plasma machine with all the noise from plasma, I do not
> think that using only half of the differential signal is
26 matches
Mail list logo
