Re: [CAD_CAM_EDM_DRO] moving table engraver

In a message dated 5/10/2003 9:50:17 AM Central Standard Time,
andrewlee@... writes:

> Will they be sufficiently round and straight for the purpose that I
> have mentioned (for engraving, not precision metal working). If so,
> will two milled holes of very slightly bigger diameter in delrin
> serve sufficently as support bearing for the x-axis moving table? I
> have access to desktop cnc lathe and mill.

Andrew: MY opinion: NO. They MUST be sufficiently stiff, and, if you will
be running linear ball-bearings on them, they MUST be at least case-hardened
to RC-58 or 60!

Delrin is only a medium-soft plastic! If supported with a steel core, it
would have to be VERY thin, if used only as a "bearing surface material", but
NEVER as a weight-bearing "axle"!

OR, were you asking if Delrin would be OK as a BEARING for a rotary table? I
am not sure exactly what you meant here, but I would say NO, again! That
should be at least an ABEC-5 if not ABEC-7 ball-bearing, preferably
double-row angular-contact, or a pair of single-row DCC deep-groove, or
angular-contact, "back-to-back".


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