Re: [CAD_CAM_EDM_DRO] Why not use threaded rod leadscrews?

Hi Paul,

Another cheap option is HTD toothed belt. Either use the belt
conventionally or have a length fixed at either end and use it in a
similar way to a rack. You need a couple of idler rollers to ensure you
get about 180 degrees of wrap around the pulley. For pricing look on the
RS web site <www.rswww.com>. As an example a 2.8 metre circumference
8M20 belt (order no 475-0759)
<javascript:openWindow('http://rswww.com/cgi-bin/bv/browse/PriceInfoPopUp.jsp?BV_SessionID=@@@@1084094631.1108043162@@@@&BV_EngineID=ccccadddkiljfficfngcfkmdgkldfil.0&cacheID=uknetscape&3285496010=3285496010&prodoid=9717491','width=470,height=500,left=100,top=100,resizable=no,scrollbars=no,toolbar=no,status=no','price')>
is £17.14 + vat. 22 teeth pulleys (350-6719) are £7.57 ea + vat. Postage
is free.

I used belt on my plasma cutter and it works really well.
<http://www.lesnewell.co.uk/Plasma/Plasma_index.html>

Les


Paul wrote:

>Stainless threaded rod is cheaply available in 1m (39in) lengths.
>I know the V thread profile is not square, not ideal for loads, not
>ideal friction wise, greater wear/backlash problems, not so
>linear.......blah, blah
>
>BUT I can save a *huge* amount of money on a 1mx1m wood router (3ft
>6in x 3ft 6in). I've been quoted over £100 ($180) for a new 1 meter
>leadscrew which I think is OTT.
>
>Also is there a cost-effective source for rack and pinions? All the
>large 8ftx4ft pro routers use rack and pinions.
>
>-Paul
>
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