Re: [CAD_CAM_EDM_DRO] Re: Step resolution question, dividing head

Alan,

The 400 (micro)steps/degree was what I got after jumping through too
many hoops. I was just trying to arrive at an even integer number of
microsteps per degree. I totally overlooked the obvious that a 1.8:1
ratio takes care of the difference between the motor and the dividing
head. Any number of microsteps at that ratio comes out to even integers,
meaning I don't need to go to ridiculous microstep resolution to do what
I want. I'm not trying to resolve arc-second positioning, just make sure
I don't run into any sort of rounding errors.

I very very seldom have to deal with sub integer angles and when I do,
it's always been a job for the manual and a sine bar. With the dividing
head however, I am making a horizontal 'tombstone' type fixture upon
which I can place sub-plates. For some jobs, I can reduce 6 setups into
1, and get a dozen parts on the indexer at a time. If I started losing
position because perhaps Ahha rounds off at the 8th decimal
(hypotheticaly) I could quickly be making 12 scrap parts in one shot.

My only problem now is that nobody makes a 54 tooth timing belt pulley
in a material I can use (don't think Lexan is ideal for my application)
So it's either gears, chains, or learn to cut my own pulleys.
Might have to hunt down that thread on the topic, it might become
important...

Thanks,

Jon