Re: [CAD_CAM_EDM_DRO] Re: My Logan Clunker & leadscrew compensation

> Not being an EMC programmer it's easy to think a software solution
> would be "easy." It would seem possible to implement this type of
> error correction as a piecewise linear transform of the output
> coordinate system. Presumably this could be layered on pretty close
> to the surface of the control program. Some coding guidance might be
> provided by the methods used to implement the leadscrew correction in
> EMC.
>

It may be necessary to first do some thinking about the nature of the
wear, and how that will effect cutter position.

For example, if the bed were worn 'down' only, as in no front-to-back
shift, only vertical displacement, then the cutter would no longer be
on center over the whole length of travel. Hopefully it would be
close enough to still work, but the coupling of vertical displacement
to horizonal for points of tagency to a circular workpiece is I
think dependent on the diameter of the workpiece. If that is true,
then you would acctually need a multiplicative rather than additive
correction to an X axis with origin at the spindle center line.

Chris

--
Christopher C. Stratton, stratton@...
Instrument Maker, Horn Player & Engineer
22 Adrian Street, Somerville, MA 02143
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