Re: [CAD_CAM_EDM_DRO] Lead screws for ever...

At 02:26 PM 10/28/00 +1300, Chris wrote:

>he's replaced the copper washer with a slightly oversize (machined?) ptfe
>washer, and just did everything up tight. He figured that the ptfe would
>apply some "sprung" preload to the bearings. The interaction between the

PTFE will cold-flow over time when it is under constant loading. Scott
would do well to check the preload every once in a while. If I wanted
something softer (i.e. less stiff) than copper, I'd probably go for acetal
(Delrin, Celcon, etc.)

BTW, for light-duty sliding contact there is Delrin AF, which is acetal
loaded with PTFE powder as a solid lubricant. It is very nice stuff.
There are similar plastics from other acetal manufacturers, but most all
plastics suppliers sell AF.

Best regards,

Randy
Randy Gordon-Gilmore ,----.___________ ______________ _________________
ProtoTrains // = = === == || == == == = || == == == = == =|
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