RE: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Posted by
dlantz@a...
on 2002-02-14 11:02:45 UTC
SO WHAT im hearing here is that for 'jog wheel'-s we need a shorted cheapo
stepper with the donut shaped encoder on the shaft, with a knob on it, with
the encoder connected to a chip to create step and direction pulses... um...
but how would that chip know what DIRECTION you are going in? do encoders
provide this information somehow?---dave l.
-----Original Message-----
From: mariss92705@... [mailto:mariss92705@...]
Sent: Thursday, February 14, 2002 10:33 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Hi,
I don't mean to pour cold water on the idea of using a step motor as
an encoder but I don't think it will work.
At speeds above 0.5 revs/sec it's a piece of cake. The winding
voltages are sine/cosine. A pair of simple zero-crossing comparators
give a clean quadrature output.
The rub, and where it all falls apart, is at speeds below that.
I did some quick experiments. Where detent torque can be felt, moving
the motor in single detent increments produces narrow 50 mV, near
simultaneous pulses on both channels. It would require
differentiation of the pulses to retrieve phase timing info from them
which then could be "assembled" into a quadrature output.
When a "real world" inertial and frictional load is coupled to the
motor (a 4" dia, .125" aluminum disk and 10 oz-in friction), it
washes out the detent and the voltage outputs fall below 2 mV.
This signal is below the "noise" level. The motor is microphonic;
simply tapping a pencil on the bench next to it produces 10 mV of
signal.
The result would be an encoder that has no output if the handwheel
were turned at a rate less than 0.25 revs/sec. Above that speed the
quadrature output would suddenly start running at 50 counts per
second. That would be very irritating.
Mariss
stepper with the donut shaped encoder on the shaft, with a knob on it, with
the encoder connected to a chip to create step and direction pulses... um...
but how would that chip know what DIRECTION you are going in? do encoders
provide this information somehow?---dave l.
-----Original Message-----
From: mariss92705@... [mailto:mariss92705@...]
Sent: Thursday, February 14, 2002 10:33 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Hi,
I don't mean to pour cold water on the idea of using a step motor as
an encoder but I don't think it will work.
At speeds above 0.5 revs/sec it's a piece of cake. The winding
voltages are sine/cosine. A pair of simple zero-crossing comparators
give a clean quadrature output.
The rub, and where it all falls apart, is at speeds below that.
I did some quick experiments. Where detent torque can be felt, moving
the motor in single detent increments produces narrow 50 mV, near
simultaneous pulses on both channels. It would require
differentiation of the pulses to retrieve phase timing info from them
which then could be "assembled" into a quadrature output.
When a "real world" inertial and frictional load is coupled to the
motor (a 4" dia, .125" aluminum disk and 10 oz-in friction), it
washes out the detent and the voltage outputs fall below 2 mV.
This signal is below the "noise" level. The motor is microphonic;
simply tapping a pencil on the bench next to it produces 10 mV of
signal.
The result would be an encoder that has no output if the handwheel
were turned at a rate less than 0.25 revs/sec. Above that speed the
quadrature output would suddenly start running at 50 counts per
second. That would be very irritating.
Mariss
--- In CAD_CAM_EDM_DRO@y..., Scot Rogers <scotr@b...> wrote:
>
> Hey all,
>
> I think someone could be on to something with using a stepper for a
> jogwheel. I'm currently waiting on a lathe with just such a
device, and the
> wheel is great.
>
> One thing though. Wouldnt it be best, since the graduations of
jogs are in
> decimal, to use a 3.6 degree stepper instead of a standard 1.8
degree? It
> would make exactly 100 marks and big, well defined dentents at
that. If the
> pulses could be generated with the motor, there could be a way to
hack the
> mouse if the device were used in a program like EMC.
>
> Scot
>
>
>
> /?*$#@%!&*
> -------------------------------------------
> Give me open source, or give me open sores!
> -------------------------------------------
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Discussion Thread
Doug Fortune
2002-02-13 21:17:30 UTC
rotary hand encoder wheels with detent
Brian Pitt
2002-02-13 21:37:28 UTC
Re: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-13 21:56:23 UTC
Re: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
ballendo
2002-02-14 04:03:40 UTC
Re: rotary hand encoder wheels with detent
dlantz@a...
2002-02-14 05:40:26 UTC
RE: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Alan Brumley
2002-02-14 06:08:27 UTC
Stepper Motor Source
Garry & Maxine Foster
2002-02-14 06:39:20 UTC
Re: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Mr. sausage
2002-02-14 07:18:21 UTC
Re: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Doug Fortune
2002-02-14 07:55:23 UTC
RE: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
rcstickman
2002-02-14 07:57:12 UTC
Re: Stepper Motor Source
Doug Fortune
2002-02-14 08:00:32 UTC
Re: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Scot Rogers
2002-02-14 08:26:26 UTC
RE: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
dlantz@a...
2002-02-14 09:16:20 UTC
RE: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Mark Ehle
2002-02-14 09:28:36 UTC
Re: [CAD_CAM_EDM_DRO] Stepper Motor Source
Jon Elson
2002-02-14 10:16:57 UTC
Re: [CAD_CAM_EDM_DRO] Stepper Motor Source
mariss92705
2002-02-14 10:33:13 UTC
Re: rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-14 10:44:36 UTC
Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
dlantz@a...
2002-02-14 11:02:45 UTC
RE: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Ian W. Wright
2002-02-14 11:27:34 UTC
Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-14 11:57:14 UTC
Re: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-14 12:11:20 UTC
Re: [CAD_CAM_EDM_DRO] Stepper Motor Source
dlantz@a...
2002-02-14 12:15:56 UTC
RE: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-14 12:23:39 UTC
Re: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-14 12:26:41 UTC
Re: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-14 12:54:17 UTC
Re: [CAD_CAM_EDM_DRO] rotary hand encoder wheels with detent
Carol & Jerry Jankura
2002-02-14 13:52:00 UTC
RE: [CAD_CAM_EDM_DRO] Stepper Motor Source
flyspeck1@a...
2002-02-14 16:07:12 UTC
Re: rotary hand encoder wheels with detent
JanRwl@A...
2002-02-14 18:46:36 UTC
Re: [CAD_CAM_EDM_DRO] Stepper Motor Source
Doug Fortune
2002-02-14 19:19:13 UTC
Re: rotary hand encoder wheels with detent
Mr. sausage
2002-02-14 21:03:49 UTC
Re: [CAD_CAM_EDM_DRO] Stepper Motor Source
Jon Elson
2002-02-14 22:35:02 UTC
Re: [CAD_CAM_EDM_DRO] Stepper Motor Source
Ian W. Wright
2002-02-15 02:59:37 UTC
Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
aspaguy
2002-02-15 12:51:26 UTC
Re: Stepper Motor Source
tedinoue
2002-02-16 03:55:19 UTC
Re: rotary hand encoder wheels with detent
imserv1
2002-02-16 09:00:47 UTC
Re: rotary hand encoder wheels with detent
audiomaker2000
2002-02-16 09:13:19 UTC
Re: rotary hand encoder wheels with detent
audiomaker2000
2002-02-16 09:29:09 UTC
Re: rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-16 14:22:05 UTC
Re: rotary hand encoder wheels with detent
wanliker@a...
2002-02-16 17:18:28 UTC
Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
imserv1
2002-02-16 22:20:11 UTC
Re: rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-17 12:10:29 UTC
Re: rotary hand encoder wheels with detent
audiomaker2000
2002-02-17 12:30:53 UTC
Re: rotary hand encoder wheels with detent
imserv1
2002-02-17 13:42:18 UTC
Re: rotary hand encoder wheels with detent
wanliker@a...
2002-02-17 15:20:14 UTC
Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
ballendo
2002-02-17 23:20:53 UTC
ball plungers was Re: rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-18 10:35:51 UTC
Re: rotary hand encoder wheels with detent
Mike Snodgrass
2002-02-18 11:19:07 UTC
Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-18 11:20:26 UTC
Re: rotary hand encoder wheels with detent
Alan Brumley
2002-02-18 11:37:08 UTC
RE: [CAD_CAM_EDM_DRO] Stepper Motor Source
Alan Marconett KM6VV
2002-02-18 11:45:39 UTC
Re: rotary hand encoder wheels with detent
Carlos Guillermo
2002-02-18 11:51:34 UTC
Re: rotary hand encoder wheels with detent
Angelos
2002-02-18 12:27:17 UTC
Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Brian Pitt
2002-02-18 13:03:35 UTC
Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Smoke
2002-02-18 14:05:15 UTC
Re: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-18 14:10:09 UTC
Re: rotary hand encoder wheels with detent
imserv1
2002-02-18 14:34:16 UTC
Re: rotary hand encoder wheels with detent
Carol & Jerry Jankura
2002-02-18 17:46:01 UTC
RE: [CAD_CAM_EDM_DRO] Re: rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-18 17:46:55 UTC
Re: rotary hand encoder wheels with detent
ballendo
2002-02-19 02:08:27 UTC
Feedrate overide was Re: rotary hand encoder wheels with detent
ballendo
2002-02-19 04:05:06 UTC
keyboard typematic and old dos stuff was Re: rotary hand encoder wheels...
Alan Marconett KM6VV
2002-02-19 10:54:07 UTC
Re: rotary hand encoder wheels with detent
jeffdavis516
2002-02-19 11:23:47 UTC
Feedrate overide was Re: rotary hand encoder wheels with detent
Alan Marconett KM6VV
2002-02-19 11:31:56 UTC
Re: [CAD_CAM_EDM_DRO] Feedrate overide was Re: rotary hand encoder wheels with detent