Re: [CAD_CAM_EDM_DRO] roller chain instead of screws or rack?

Jon,

Thanks for the tip. I used various methods to dampen the vibration. It
definately could have been totally worked out, but the machine got so little
use, that it was sort of left alone in an OK but not great state.

Tom E.

----- Original Message -----
From: Jon Elson <elson@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, July 26, 2001 11:18 PM
Subject: Re: [CAD_CAM_EDM_DRO] roller chain instead of screws or rack?


> Tom Eldredge wrote:
>
> > Dean,
> >
> > I used synchronous belting pullys and aircraft cable on an 11 ft. plasma
> > cutter table gantry. Had trouble with vibrating belting as the speeds
and
> > position of gantry in relation to the end pullys. I think chain would
solve
> > that problem. Sounds good to me.
>
> The systems I've seen that work use a cable or belt that lays on a flat
> plate. There is a mechanism that picks up the belt, wraps it around a
drive
> wheel, and then lays it back down on the plate. The plate could be the
actual
> track the machine moves on. There are some problems with bending the
> belt backwards on the rollers which shortens the belt life. Since the
belt
> is not going round and round pulleys in a standard belt drive scheme, it
> apparently handles this pretty well. If you can make the belt wrap one
full
> turn around the pulley, you can eliminate the rollers. This may not work
> except with cable or a very thin toothed belt.
>
> I think this scheme even works if the drive pulley has a vertical shaft,
> so the belt really doesn't 'lay' on the plate, but when it starts to flap,
it
> hits
> the plate and the vibration is damped out.
>
> Jon
>
>
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