Worm Gear pillage

[michael3fingers]

Hello everyone

I am thinking about making a rotary table. I was just wondering if anyone knew where I could find a good worm gear?

Like I have said in a previous post I have been able to make an acceptable manual rotab, so I am thinking my next best bet would be to make another one but better.

thanks all

[Circlip]

I'm chiming in before HE gets a chance, have you checked his holiness's site, division plates too.

Regards Ian.

[michael3fingers]

hello sir

as you can tell by my post count that I am a newb and thusly am un aware of the site with which you speak.

[Circlip]

Sorry, the illustrious Sir John Stevenson, (Did I spell it all correctly John???)

No connection whatsoever, just another dissilusioned fat chewer.

Regards Ian.

(PS. Look on the bottom of one of his postings for the site)

[Evan]

They aren't hard to make. I have made quite a few including this one. This is 7075 alumimnum, slightly harder than steel. Bronze is a good choice and easy to machine although a bit expensive in the larger sizes. Steel works fine but requires a tool steel hob, not a big issue if you can harden it.


Shown is the wheel and the hob used to cut it.

[michael3fingers]

hello evan could you please make me one and send it to australia?

[Circlip]

You got mail Michael

[michael3fingers]

hello chaps

was a good day,

I got a reduction gear box to use as a guts to my rotab. I was thinking of building a box for it and arranging some kind of thrust bearing system for it.

I was thinking that why don't I just make an adapter and bolt the chuck straight onto the output shaft, add a dial to the input shaft and bobs your aunty..

does anyone know if this box could handle the loads placed on it when used beneath a milling machine to cut radii etc?

Just putting it out there......

[Evan]

Looks like a 6206 bearing on the input shaft and a larger deep groove bearing on the output. It looks pretty stout to me. It should work. The only concern is damage to the bearing from shock loads. Ball bearings have a much lower allowable static load than dynamic load. They are a lot easier to damage when they are not turning.

[michael3fingers]

thanks for the reply evan,,

I was just looking at this picture here

http://www.phase2plus.com/details.as..._TABLES#221304

at it looks basically the same.... add a handle and away I go.

as long as the output shaft has limited movement (side to side, in and out) I cant see it being any worse than a cheap import.. If problems arise I could always redesign parts of it.