diamond: Re: [DIY-CNC] Direct belt drive for 4'x8' torch table

Hi Marcin,

There are some free "plans" here:

http://www.cnczone.com/forums/showthread.php?t=16634

http://www.cnczone.com/forums/showthread.php?t=14488

You may need to register, but it's easy, free and no spam.

The first link uses chains and the second screws. There may be others at
CNCzone with belt or rack and pinion but I usually stick with looking at
router and mill threads. I'm pretty sure there were some router table builds
with belt. The chain and belt should be pretty similar on a torch table. The
only tables I see at my customer's sites are rack and (very worn out
usually) pinion. But these are multitorch, heavy gantry, dual drive tables
using DC brush servo and gearboxes. But working on burning table controls is
an insignificant part of my usual work.

The table on the link you posted looks suspiciously like a router table. I
don't think those slides would hold up well in a burning application.

Mike Nash

----- Original Message -----
From: "marcin_ose"

> Hello,
>
> I am looking at Xylotex.com 425 in oz motors to drive the long axis of
> a 4'x8' torch table. I'd like to use a 3/8" pitch by 1/2" wide belt
> that functions as a rack. The pinion is a pulley of 2" diameter. I'd
> like to have one drive motor on each side of the long axis.
>
> Would I be able to drive the pulley directly with the motor, or do I
> need some gearing on the motors?
>
> I've considered ball screw assemblies, but it appears that I don't
> need such high accuracy, and simple belt drive will get me at least
> 1/30 inch accuracy on the torch table, if I don't use microstepping.
> Are the 3/8" pitch pulleys sufficiently accurate for this? I am trying
> to do the rack-and-pinion belt instead of ball screws for lower cost:
>
> http://openfarmtech.org/index.php?title=Torch_Table
>
> Sincerely,
>
> Marcin
> openfarmtech.org/weblog/
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database: 269.19.21/1267 - Release Date: 2/8/2008
> 8:12 PM
>
>