Quote:
Originally Posted by kinetic
Hi,
For the RA axis I used a small reduction gearbox/ optical wheel assembly I
pulled out of an old hand scanner I pulled to bits years ago 
This gear train is perfectly suited for this purpose and that's also exactly
why I held on to it!
Steve |
hi Steve,
I know this thread is over a year old, but came across it while looking for DIY optical encoder designs.
just a comment on the gear reduction in the pics.
is'nt the gear reduction at the 2nd stage inverted?
tracing from the capstan shaft to the encoder wheel.
(using arbitrary values for illustration )
gear ratio from capstan shaft to next gear - 8:1
gear ratio from 2nd gear to 3rd gear - 1:8 - (this gear should ideally drive the next stage from a small to large gear)
gear ratio from 3rd gear to encoder wheel - 8:1
gear ratio from 3rd gear to encoder gear - 1:8
don't really understand how you get gear reduction, from what i can see, you'd effectively have no reduction.
not sure if I'm correct or if you'd noticed this.
if I'm correct, you might get better resolution if you correct the gear reduction. thought it might help.
but thanks for the info.