Re: [CAD_CAM_EDM_DRO] Re: Z axis drive

A lot of retrofit builders use the air springs as a counter balance for both
the Z axis quill to keep the backlash out and some use two of them on the
knee to take up some of the load and to prevent dropping of the knee if they
use a ballscrew. Myself, I retofitted my enco 8X36 knee using the existing
acme leadscrew driven by right angle gears and one of my 600 oz in servo
motors and a 2.5/1 ratio timing belt pulley drive. I don't run it that fast
but it runs with no heat probl;ems but I am running it a bit on the slow
side.
Dan Mauch
low cost stepper and servo motors.
cases for Gecko drives
kits and assembled 3-4 axis drives
www.camtronics-cnc.com
www.seanet.com/~dmauch

----- Original Message -----
From: "George Taylor, IV" <gtaylor@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, January 06, 2006 11:14 AM
Subject: RE: [CAD_CAM_EDM_DRO] Re: Z axis drive


> Pete,
>
> How about details (where to start, sizes, etc.). Wouldn't the pneumatic
> cylinders similar to those used in cars work just as well without the
> complexity (and cost) of the tank/regulator?
>
> George
>
>
> Since there is plenty of room under the knee on a Bridgeport and the
> travel isn't too far, you might benefit by sticking a good sized
> (bore) pneumatic cylinder under there connected to a small tank and
> regulator. Take some of the load off the leadscrew and you should get
> better performance and less heating for very little cost.
>
> Pete C.
>
>
>
>
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