Re: RE: DRO/cable source

I guess that is why the big machines use either linear scales or belt drive
them off the screw or direct drive them from the motor.
Darrell

----- Original Message -----
From: Bertho Boman <boman@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Friday, February 25, 2000 11:05 AM
Subject: Re: [CAD_CAM_EDM_DRO] RE: DRO/cable source


> From: Bertho Boman <boman@...>
>
> This business with coatings on the cable bothers me. For absolute best
accuracy we should have a wire that has a known and
> uniform size. Since the plastic coating will compress around the shaft,
it will look like a change in effective diameter. If
> that is exactly repeatable it would be OK.
>
> The problem I worry about is that the compressability of plastic varies
with temperature and for some materials it vary with the
> rate of change. We could get some interesting errors to hunt for if the
calibration factor varies with table speed.
>
> Bertho Boman
>
>
>
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