Re: [CAD_CAM_EDM_DRO] Cool Worm Gear

I made a worm gear for an acme thread when I made a threading dial for
my lathe. I found it useful to gash the gear blank before hobbing
it; it made it cut the right number of teeth w/o a problem.

Paul

>
> Hi,
>
> I've made wormwheels successfully using a tap as a hob. The ones I have made
> so far have used a 1/2" whitworth tap and a 1/2" whitworth screw as the
> worm. It can be a bit awkward at first to get the size of the wheel right
> but it easy enough to start with the blank a bit oversize and just keep
> feeding the tap in until the teeth look right, bearing in mind that the
> blank needs to be sized so that the final wheel will have the right number
> of teeth. If you polish the screw thread a bit, they work together as sweet
> as any commercial gear pair. The teeth on the wheel pictured on the web page
> you referenced are considerably shallower than the ones I used.
>
> Ian
> --
> Ian W. Wright
> Sheffield UK
> www.iw63.freeserve.co.uk
> ----- Original Message -----
> From: "Joe Vicars" <jvicars@...>
> To: <CAD_CAM_EDM_DRO@egroups.com>
> Sent: 02 November 2000 21:38
> Subject: [CAD_CAM_EDM_DRO] Cool Worm Gear
>
>
> > Here is a source for worm gears that use regular thread form. Looks
> > pretty handy. I wonder if you could set up your own "gear hobber" using
> > a tap as the hob? Would it work ?
> >
>
>
>
>
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--
Paul Amaranth | Rochester MI, USA
Aurora Group, Inc. | Systems & Software
paul@... | Unix / Windows / NT