Re: Building a small 4th axis

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler"
><eexgs@n...> wrote:
>
> That looks excellent! What was that gearbox origionally used for?
>I
> have seen similar looking units sold by www.rino.co.uk for big
>bucks.
>
> Cheers,
>
> Graham
>
> > Graham,
> > have a look at
> >
>http://homepage.ntlworld.com/stevenson.engineers/lsteve/files/taig%
> > 204th%20axis.jpg
> >
> > for some idea's.
> >
> > John S.

Graham,
These are off the shelf gearboxes brought in from Italy. They are
very well made and the backlash is negligible.
I didn't spot the bit about the Proxxon until Tony mentioned about
size. Even this may be a bit big for your job.
Just had a look thru the box of bit tonight and found this:-

http://homepage.ntlworld.com/stevenson.engineers/lsteve/files/small%
204th.jpg

It's a lot smaller, the shaft is 3/8" diameter by 1 3/4" long.
Without counting I think it's a 60:1.
The stepper isn't fitted, it's just for show.
If this is any good to you you can have it for the postage.
Drop me a line off list john [at] stevenson-engineers.co.uk

John S.