Re: [CAD_CAM_EDM_DRO] Re: [DIY-CNC] need transmission ideas / advice re: gantry

On Mon, 11 May 2009 20:55:36 +0200, you wrote:

>
>I am making a large cnc-driven gantry, which is done.(4.4 m wide, 4 m
>lift, 8 m rails).
>At the last moment, I ran into some difficulties at the transmission;
>2-stage, HTD 5 mm 15 mm wide steel pulleys and timing belts, 1:3 to 1:3 for 1:9 total.
>
>I have no way to get electricity to the site, we run from 2 large
>batteries of 12 V DC (200 amp hours each).
>
>I am using a DC treadmill motor, from surplus center, rated upto 2.5 HP
>and 130 V DC.
>Unfortunately, the motor seems to be too weak on torque !
>
>Any ideas on how to move the gantry ?
>
>

You might find something here:
href="http://www.allelectronics.com/make-a-store/category/400200/Motors/DC-Motors/2.html"