Hello David,
how did this funny gear ratio come to be? Assuming it's tooth gears or a
belt drive, can't you change it to 55/55 or 68/68 or some other 1/1
ratio, which would solve this problem? Years ago, I made drawers full of
gears for cases like this, letting my little mill make gears for itself,
the large mill and the lathe with MS Excel and a home made stepper program.
Peter
Am 29.11.2018 um 06:52 schrieb David Berndt:
Alright, Dragging this back up.
A knockoff Omron encoder showed up in the mail, well I assume It's a
knockoff at this price. Mounted it, wired it up. But it's on the back
of the mill and geared 68/55 to the actual spindle output.
So now the question is, what do I setup scaling to? Set scaling so
that X pulses = one rotation? That seems to be the correct thing based
on my reading. What if anything do I do with my index pulse then? It
fires every 2000 counts, which is useful for keeping track of lost
counts perhaps but not much else, as it doesn't repeat based on
physical location on the spindle every rotation. Disconnect it and run
a real once per rotation index? Contrive some sort of index scaling
using oneshot or something crazy like that?
Regards,
Dave
On Thu, 01 Nov 2018 06:30:19 -0400, andy pugh <bodge...@gmail.com> wrote:
On Thu, 1 Nov 2018 at 03:31, David Berndt <ber...@uberwin.com> wrote:
That doesn't sound particularly hopeful for me and my plans. I guess
maybe
a more traditional/proven approach of a through-beam sensor with
interrupting disk and much much lower resolution encoder ring with
drilled/milled holes might be the way to go.
I think that the AEDR _ought_ to work. They are a commercial product,
after all.
Part of my problem was that I had no adjustment for sensor-to-target
spacing, and to make matters worse I had a sensor and a target on both
sides of the PCB (The PCB was sandwiched between two encoders, because
of the wacky idea I was experimenting with).
I mainly gave up because my (scratch built) motor turned out to be
rather too weak.
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