Re: [CAD_CAM_EDM_DRO] Re: cable drive for X axis

If you have multiple wraps on the drum, the cable will walk from side
to side the diameter of the cable for each revolution. If you have a
drum with a 12" circumference, and 0.250" cable, the cable will walk 10
* 0.250" or 2.5" for a 10' move. At least that's what it will want to
do.

That's why I mentioned slippage. Since the cable will walk with
multiple turns, I assumed you would use a single, incomplete, turn
around the drums.

My employer uses timing belts over 24' long. Not sure what the vendor
is, but could probably find out, if you want.

Regards,
JJ

On Monday, Jan 19, 2004, at 03:53 US/Eastern, onthemarcxyz wrote:

> I don't know if I could find a timing belt 24' long and would have
> the same problem with it slapping around. I will have to run a low
> tech test on cable with 12' span and weight with multiple reversals
> in direction.
> I'm not sure what slippage you refer to. The cable would be a closed
> loop system with a fixed end on the drum. The wraps on the drum
> would be side by side so the same
> feed rate would come from each revolution.
>
> Marc
>
>
>
> -- In CAD_CAM_EDM_DRO@yahoogroups.com, "onthemarcxyz"
> <onthemarcxyz@y...> wrote:
>> Hi all my name is Marc,new to this group.
>> I am thinking of building a CNC router with a 12' X axis.
>> I was first thinking of rack and pinion drive but was concerned
>> about backlash. Then I was thinking of using cable prestressed
>> between two drums driven by the servo seems this would have no
>> backlash?
>> what do you think.
>>
>> Marc
>
>
>
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