Re: [CAD_CAM_EDM_DRO] positional resolution

cadcamcenter@... wrote:

> Hi
>
> A leadscrew with 20tpi and 200step/rev should have a positional
> resolution of 1/(20x200) = 0.00025 in.
>
> Have I missed something in the above calculation because I read on
> the website of a system vendor listing the positional resolution as
> 0.000125 in.
>
> Further, if in the above example, one uses 10x microstepping, is it
> presumptous to claim a positional resolution of 0.000025in?

Sure, that's your resolution. Don't be confused into thinking that is
your accuracy or repeatability, however. it won't be anywhere near
that level. The other concern is computer capability to put out
steps. If the computer is limited to 25,000 steps/second, then
you will be limited to .625 in/sec or 37.5 in/min. On a Sherline,
this may be acceptable, on a larger machine, the waiting would
drive you nuts.

Jon