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wrote:
For home made engraving machines and some lighter weight machine tools,
bushed round rod ways are practical. Sometimes ball bearings are used
on such ways to reduce the backlash-type of error caused by static and
dynamic coefficients of friction. (Siction)

In assembly and disassembly work, I frequently make use of a stiction
overcoming method, specifically, to keep one axis moving while
postitioning another.

I am thinking now that the bushed round rod ways of a machine tool
could be driven, overcoming stiction.

Let me know if this would be more complicated than ball bearings riding
on the round rod ways.

Remember, bushed ways are self-wiping, while bearings rolling on rods
are very sensitive to "lint" (chips and sward).

Yours,

Doug Goncz
Replikon Research
Seven Corners, VA 22044-0394

You're speaking of turning the rod while a small adjustment is being
made? Should work well.. What about vibrating it? Like when you tap a
piece with a hammer as you're moving it? AC coil set at the end of the rod?

John