CAD CAM EDM DRO - Yahoo Group Archive

Re: rotary hand encoder wheels with detent

Posted by Doug Fortune
on 2002-02-14 19:19:13 UTC
Bob wrote:

> I posted the links to show some people are using steppers
> as encoders and that they do work in some applications!

Marris wrote:

> I'm OK with that ... I guess I'm just looking at it
> from the point of view it has to work all the way down
> to zero speed. It's a shame it can't do that.


OK then, we're back to my original suggestion:

- use a stepper essentially for the mechanical 'feel' only

- however it can be used to conveniently mount a big knob
on the top, the stepper to the underside of your front panel,
and an encoder on the bottom (of a dual shafted stepper).

- the steppers can have the coils permanently (or I suggested:
intermittantly) shorted to create a harder feeling 'detent'
for slower rotational speeds for 'sneaking up' on a position,
and open circuited to get a freer feel for traversing longer
distances (ie many spins).

- encoders are a well known commodity, and do not need any
R & D to get it working. I might whip one up tonight!

- Scot Rogers suggested using a 3.6 degree stepper to get an
even 360/3.6 = 100 detents per revolution, and each step
could represent 0.1", 0.01", 0.001", 0.000 10" depending on
which of four modes it is in.

1.8 degree steppers (200 steps/rev) are more common, and thus
each step could represent 0.05", .005", 0.000 50", 0.000 05"
instead (for a total of 1"/rev .1"/rev, 0.01"/rev and 0.001"/rev).

- finally, such quadrature outputs from the encoder can be sent
back directly to two input bits on the parallel port (or game
port) for sensing by your favourite gcode interpreter program.

Some new people are wondering if & how the two quadrature bits
can specify direction: yes they can (two square waves are
generated, but offset from each other) - depending if you are
going CW or CCW (ie left or right) makes one channel 'lead' or 'lag'
the other. Of course the distance is determined by counting the
actual number of pulses going by.

Note:
Not only can this technique be used for a rotary 'jog' handwheel,
but also for fine-grained 'feedrate over-ride' (but I prefer a
potentiometer for that, fed back into the analog game port).

Doug Fortune
http://www.cncKITS.com


































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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