On 7/30/23 00:12, John Dammeyer wrote:
Hi Gene,
Best answered with the data sheet.
https://www.cuidevices.com/product/resource/amt11.pdf
A Capacitative device. Not a hall effect. The capacitative may be faster
than a hall. The reason I'm anti hall is the time lag in the hall world
due to the time it takes to do the A/D conversions, which in turn means
the hall encoded setup moves in jerks depending on the speed of that
conversion. The 42C series of small motors, seen as ideal for a 3d
printer, are a disaster because they don't move step by step but jerk by
jerk, frequency of jerk determined to the speed of the A/D. Optical can
determine where the motor is and which direction its turning from any
edge of either A or B signals. At sufficient microstep divisors they can
move quite pretty smoothly. I'd assume this time lag in less for the
capacitative, but at the same time there is the Nyquist effect but the
capacitative conversion is simpler, but the serial output still enforces
a lag in the data stream. Only optical, which at higher and fixed
resolutions is instant. The question remains then "is capacitative fast
enough". And that IDK. The 115 kilobaud output says no to me. That
alone would make me go shopping for a ABI encoder.
But I'm known to be picky. That's an optical $22 Omron 1000 ppr on the
back shaft of the 1 hp in my g0704. With the gear ratio being
switchable, and that encoder rated for 6k revs, but I watch spindle revs
in the tach display. Top spindle is 3k revs. So times a hair over 7100,
its seeing motor revs of nearly 21k revs at full song and not missing a
beat for about 5 years now. Scale for high gear is a hair over 7100 per
spindle rev. I don't use the index, that is generated by a screw glued
to the spindle going by an ATS-667 hall effect. That has its own
direction problem I'm not smart enough to fix. Someday...
Not cheap in Canadian $.
https://www.digikey.ca/en/products/detail/cui-devices/AMT113Q-V/4835229
John
-----Original Message-----
From: gene heskett [mailto:ghesk...@shentel.net]
Sent: July 29, 2023 9:02 PM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Drilling holes in the back of a stepper motor
On 7/29/23 22:36, John Dammeyer wrote:
Here's my solution. Drilled and milled 0.065" aluminum. Two counter
sunk
holes in the back. The modified flat head screws epoxied in serving as
threaded studs. Then followed standard CUI installation and alignment
instructions.
Now to interface to it and write software to capture the motion and
position
John
Just one question John, is that encoder optical, or hall effect?
Optical is real time, hall effect is not.
-----Original Message-----
From: Curtis Dutton [mailto:curtd...@gmail.com]
Sent: June 26, 2023 6:28 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Drilling holes in the back of a stepper motor
On a past life before I started using servos I had attached encoders to
my
steppers to stop the machine when steps were missed. I used us digital
encoders that came with adhesive backed mounts from the factory. They
worked swimmingly. I still have one in the "spare parts" room. The
encoder
is still securely attached over 10 years later. "double sided tape"
essentially woked very well.
On Mon, Jun 26, 2023, 3:11 PM Todd Zuercher
<to...@pgrahamdunn.com>
wrote:
I was just about to suggest gluing the thing on. You beat me to it.
Todd Zuercher
P. Graham Dunn Inc.
630 Henry Street
Dalton, Ohio 44618
Phone: (330)828-2105ext. 2031
-----Original Message-----
From: Roland Jollivet <roland.jolli...@gmail.com>
Sent: Monday, June 26, 2023 1:17 PM
To: Enhanced Machine Controller (EMC) <emc-
us...@lists.sourceforge.net>
Subject: [Emc-users] Drilling holes in the back of a stepper motor
[EXTERNAL EMAIL] Be sure links are safe.
You have such a large flat surface area there. Design an encoder mount
plate of similar size where the end result is also has a flat surface.
Rough and clean the back of the motor up, then use a decent
polyurethane
adhesive to bond it on. During the setup you could use a jig to keep
it
concentric with the shaft.
Design it in such a way that you can still replace the encoder if need
be.
Roland
On Sun, 25 Jun 2023 at 05:31, John Dammeyer
<jo...@autoartisans.com>
wrote:
I want to add an encoder onto the back of this stepper motor. I can
install either a US Digital or a CUI since both mounting flanges can
extend out near the edges of the back mounting plate.
Is there any reason I can't clamp the motor in a vice and pop in two
holes
and tap them with a bottom tap at the spacing of the mounting flange?
John
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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 <http://geneslinuxbox.net:6309/>
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.
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 <http://geneslinuxbox.net:6309/>
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