Mine is a used BEI encoder I was given more than 10 years ago. Digikey lists
them at $800. For the sake of this Pi4 spindle testing I could just use the
servo Amp encoder outputs scaled down by the drive. Would be easier. Sent from
my Samsung S10
-------- Original message --------From: Chris Albertson
<albertson.ch...@gmail.com> Date: 2021-06-18 9:48 a.m. (GMT-08:00) To:
"Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Subject:
Re: [Emc-users] Machining question By total coincidence, I am doing the exact
same thing. I just bought a 600line optical encoder and now I'm attaching it
directly to a motor. Thepurpose is to write and debug some control software.
In this case, IREALLY DO WANT to run at the encoder's maximum rated speed of
5000 RPM, orelse what is the point of the test?BTW, this control software will
run on the new Raspberry Pi "Pico" that isselling for $4 per unit. It is a
surprisingly powerful computer at a pricepoint close enough to "free" that it
does not matter. (Few people wouldcare much between paying $0 or paying $4.)
I think this "Pico" should beable to run four motors and four encoders all at
5000 RPM. We shall see.On Fri, Jun 18, 2021 at 9:21 AM Stuart Stevenson
<stus...@gmail.com> wrote:> Sounds like a good plan. Hopefully the testing
won't involve high rpms so> the od not being perfectly concentric will not
matter. The motor bearings> will handle it but maybe the encoder bearings won't
be as robust.>> On Fri, Jun 18, 2021, 10:52 AM John Dammeyer
<jo...@autoartisans.com>> wrote:>> > This isn't as much a LinuxCNC question but
more of an approach to how to> > machine something.> >> > The attached photo
shows a coupler from a 3/8" encoder to 14mm Servo> Motor> > so I can test on
the bench the Pi4 closed loop encoder behavior.> >> > This one didn't turn out
very well. I drilled all the way through and> > then used a reamer to bring it
to 3/8". It's a firm sliding fit on the> > encoder shaft. Without removing it
from the chuck I then drilled halfway> > to 13mm and then used a 14mm reamer to
bring it to size, testing with the> > motor shaft.> >> > Problem was the reamer
was slightly tapered at the front so it did a poor> > job. I finished it up
with the boring tool but maybe a few thou too> > large. However the wobble
seems much worse than that.> >> > I'm thinking the better approach would be to
drill all the way through> > undersize 3/8" and then drill half way with 13mm.
Then only use the> boring> > tool to bring the back half up to 3/8" and the
front up to 14mm. This> way> > if the initial hole wasn't concentric with
rotation the boring tool would> > ensure it is.> >> > Make sense? Or is there
a better way?> >> > Thanks> > John> >> >
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Emc-users@lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/emc-users>-- Chris
AlbertsonRedondo Beach,
California_______________________________________________Emc-users mailing
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