Re: [CAD_CAM_EDM_DRO] lead screw pitch

gorton22 wrote:

>I have been trying to figure out what encoders to get for my mill. The
>mill has ball screws in it. I put a dial indicator on the table and
>got .316 per revolution. This was not a sientific measurment it could
>be a few one way or the other. How do I calculate for the number of
>counts of the encoder for a resolution needed. Is this lead screw
>metric? If so will that effect a machine using inches. I will try to
>get a more accurite measurment of the screw to make sure. Thank you
>
>

Ugh! This is a hard one. 5/16" is .312", but 7 mm is .315" I've never
seen a 7 mm ballscrew,
but maybe they came up with that to use 5 mm balls.

EMC will have no problem with odd encoder counts, but some other
programs that require
integer numbers for counts/inch might be a problem.

Jon