Re: [CAD_CAM_EDM_DRO] LEAD SCREW"

In a message dated 1/15/2003 11:52:22 AM Central Standard Time,
peja@... writes:

> I can buy one meter long screw, 20 mm diameter with four triangular tooths
> per milimeter. (I think it's used in wood constructions).<<

This would be 0.25 mm per thread? That is VERY fine, as would be used on 1.0
mm. screws! Are you sure you don't mean four mm. per thread? I use 20 mm.
dia. screws with 4 mm pitch on my machines (but ACME threads).

> It seems to me usefull as axis leading screw. HOW MUCH IT CAN BE PRECISE ?

If this material you describe is simple V-thread "All-Thread" ("Fastener
stuff"), it is not only probably not very precise, but the surface of the
threads is rough, intended for fastener-nuts which are turned with a WRENCH
("spanner" in England), and let remain still forever!

Jan Rowland





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