Re: [CAD_CAM_EDM_DRO] To Belt or Not to Belt

In a message dated 22-Feb-01 23:55:21 Central Standard Time,
carlcnc@... writes:

> Any input is appreciated.
>

Carl: I suppose if your absolute-positional accuracy is not as critical on
the alum. and plastics as much metal-machining demands, i.e., "same as good
cabinetmaker work" is close enough, then the belt would be OK. Have you
considered the Berg "cable-chain" stuff"? They do a number of different
sprocket, bead, ladder, etc. polyurethane-over-steel-cable miniatures and
many, many sprocket-gears to fit each different kind. All very, very
nice/precision, with commensurate pricing. But a tad more "buildable" than
such a large (6x10') X-Y table with ball-screws. I know! I did one about
5'x12' with 1.5" dia. preloaded ball-screws and Thomson linear ball-bearings
in '85 for a WW firm in England, and I TELL ya! NOT a "summer project" for
ONE quasi-retired old phart in his back-yard shop (though I did it "on time"
and flew over with it to assemble it and blow minds!). Secret: Even with
"wipers", ball-screws and WW do NOT mix! Precision, repeatability, yes.
Acceptable, but not really "the greatest" rapid-traverse. Amazing. but...
Don't wanna TALK abouddit !!! Jan Rowland




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