Re: Is this too nuts to consider ?

--- In CAD_CAM_EDM_DRO@y..., beer@s... wrote:

> On 25 Jan, CAD_CAM_EDM_DRO@egroups.com wrote:
> >
> > Personally, I think it would be much simpler, quicker and lots

cheaper to

> > simply use a differnt gear ratio on one of the compound gears

between the

> > spindle and the gearbox.
>
> It would be, if I could find suitable gears. Unfortunately, I

can't.

>
> The manufacturer sells a pair of gears that gets things down to 4TPI
> with the stock leadscrew - with my fancy ballscrews, that means 8

TPI.

>
> What I want is ONE TPI.
>
> I'm making a focuser for a Newtonian telescope .. a tube inside a
> tube, basically. I plan to cut the coarse thread on the outside

of

> the inner tube. The outer tube will have a single small diameter

ball

> spring loaded, pressing into the thread.
>
> Alan
>
>
> --
>
> Alan Rothenbush | The Spartans do not ask the number

of the

> Academic Computing Services | enemy, only where they are.
> Simon Fraser University |
> Burnaby, B.C., Canada | Agix of

Sparta