Re: [CAD_CAM_EDM_DRO] Crazy Ideas Vol 1

On Tue, 3 Jun 2003, [iso-8859-1] Stephan Kotzé wrote:

> Hi All
>
> First problem I face is leadscrews. I did not buy commercial units,
> instead settling on normal M10x1.25 thread (cheap). I read on a website
> (about optical equipment) about lapping these to give an accurate
> thread.

Sounds interesting. Could you post a link to that site?

> That is now done. Next problem is mounting them. I got a bicycle
> axis and split this in 2, giving me 2 adjustable angular contact units.
> I noticed that they did not run very smooth, and after investigation I
> saw that they have a very rough torque nut. Setting up a Dremel and
> fitting these units onto bearings, I ground them smooth and accurate
> (pictures available for those that want to see).

Yeah, I definitely want to see :)

> They now run extremly
> smooth even when overtorqued. Next problem is the nut. I have seen
> various designs on the net for these, but none to my satisfaction. The
> roller screw nut design in the files section is very interesting and i
> think i will go for that. Problem is I do no have my lathe yet, so I
> might have to settle for a Delrin or oil impregnated Nylon nut, tapped
> long enough to take up any backlash.

I have some oil impregnated Nylon that I was going to try this on but I
haven't done it yet.

> Couple of questions:
>
> Anyone have a recommendation for homing switches. They obviously need to
> be fairly repeatable. (optical, mechanical)

Mechanical ones won't have problems with getting blocked by chips.

C|