If you actually have access to all 4 coils - then I would use types 9 or
10. This would be half stepping and give you 2000 steps per inch.
(.0005 per step) 200*2*5.
at a normal base period of 50000 - you could get (without using
doublestep) 300ipm easy. Not that your machine would actually do that.
sam
Kirk Wallace wrote:
On Wed, 2008-04-16 at 12:27 -0400, John Kasunich wrote:
Kirk Wallace wrote:
Thanks for your reply, Erik. I was wondering if there was a way to
figure out the steps per revolution with the motors disconnected, but
it's probably not important, because I can adjust settings after I get
the motors working. Although, it would be nice to know to figure out
what pulse rate I would need for my planned rapid of 100 inches per
minute (with 5 rev. per inch screws).
Small steppers (as in printers, etc) tend to come in all flavors. But
once you get into the kind of motors that are used on larger machines,
200 step per rev is the huge majority. In your shoes, I would assume
200 until proven otherwise.
Regards,
John Kasunich
Thanks John and Jon. While I was using the machine, it seemed I could
dial in a least a half thousandth on the axis dials and the motors are
directly coupled. There is .2" per rev. so at least 400 half thousandths
or steps per rev. I must be missing something about steppers.
So for 200 steps/rev:
100 inches/minute x 1 minute/60 seconds = 1.6667 inches/second
x 1 rev./.2 inches = 8.3333 rev./second (500 RPM)
x 200 steps/rev. = 1666 steps/second
That seems a little low. It is well within parport frequency, though.
Stepgen type eight seems to be what I need. I assume that for a
direction change phase C and D sift two periods or a half wave? I could
use an inverter chip to create phase B and D from type 2 but I don't
mind using two more pins. I guess that could change.
I found that the controller ground was +12 Volts relative to my scope
probe, so I rigged up an optocoupler and it works well. Now, with
another opto, I can scope out the driver IO.
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