Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive

----- Original Message -----
From: <bjammin@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, January 03, 2003 8:34 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Belt vs. Direct Drive


> At 08:17 AM 1/3/03 -0000, you wrote:
> >With direct drive, unless you are very confident of the alignment of
> >motor spindle with the screw, you should always use a coupling that
> >is tolerant of misalignment;
>
> Not at all ... I hung motors directly on screws once using rigid
couplings,
> which I made in one op for good concentricity. The motors just overhung
the
> screw ends, right out in space. The motors were drag-linked to the machine
> frame using a stay from flange to the anchor point. The stay can be
> slightly flexie from side to side as long as it doesn't stretch or shrink
> when torque is applied. This is the most rigid arrangement possible for
> transmitting torque, and the motor and screw bearings have no trouble
> supporting the motor weight. Try it, it's clean, simple, quick and very
> effective.
>
> Regards, Hoyt McKagen
>
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