Phil,

On Thu, 11 May 2006 15:31:44 +0100, Philip Pemberton wrote:

>... 
> I might have a go at building a CNC. I've got a pair of dead HP Laserjet IIIs
> that I snaffled the main drive motors from. Only problem is, the shaft isn't
> the standard "half round" one you find on most motors - it looks like one
> continuous worm gear. To date, I haven't found anything I could use to mate
> it to a leadscrew.

Ah, you didn't take the mating part from the printer(s) then?  I always try to make sure I have matching parts 
when I cannibalise something...

> That said, I still need to track down some leadscrews and some metal rails.
> Copper or brass pipe might be an option, but wouldn't be very resistant to
> damage (one dent and you get to replace the rails sort of thing).

These would wear really quickly.  If you can't get steel rails (silver steel would be good) then at least use 
chromed copper, so there's some resistance to surface wear.  Otherwise the copper (/brass) will creep away 
from the bearing surfaces.

Cheers,


Howard Winter
St.Albans, England


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