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

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.

Tom Eldredge

----- Original Message -----
From: <deanc500@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, July 26, 2001 10:37 AM
Subject: [CAD_CAM_EDM_DRO] roller chain instead of screws or rack?


> Hi, I have built several small router tables out of both wood and
> metal with varying degrees of success. I used lead screws and
> anti-backlash nuts on all of them. I am now building a 5'x10' plasma
> cutter. At first I thought rack and pinion was the best option, but
> then while recently visiting a sign shop for supplies, I noticed a
> large CNC router in the back. I asked to have a closer look and was
> surprised to see a #35 roller chain drive. There are 34 frame steppers
> driving the chain through a 3.5:1 reduction. Since the gantry only
> goes back and forth, the chain did not make an entire loop, but
> instead, half the chain was replaced with aircraft cable. At the far
> end of the table, the cable loops around a simple pulley, which is
> tensioned with a large spring, getting rid of any backlash. The table
> has been in service for 12 years and the owner is very happy with it.
> This system seems to be much simpler and cheaper than rack and pinion
> and allows for greater flexibility regarding gear reduction.
>
> Has anyone used chain drive before? Are there any drawbacks to a
> roller chain drive system?
> Thanks
>
>
>
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