Re: [CAD_CAM_EDM_DRO] Buying or CNCing some odd angle bevel gears. I'm stuck !!

Hi Paul:
You can't hob a bevel gear.
The tooth cross section changes across the width of the tooth.
Cheers

Marcus

----- Original Message -----
From: "Paul" <Paul.Corner@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, January 12, 2002 5:07 AM
Subject: Re: [CAD_CAM_EDM_DRO] Buying or CNCing some odd angle bevel gears.
I'm stuck !!


>
> Hi Tom
>
> Perusing the HPC catalogue www.hpc-gears.co.uk I can only find 90Deg bevel
> gears. I fear you will have to make your own - This is not as difficult as
it
> first appears. I have cut some gears in the past using a free hobbing
> technique with some success after reading about it in Model Engineer.
>
> To describe the method in words is rather long winded, but I could set up
a
> machine and take some photos for you. Conact me off list if you're
interested.
>
> CNC content - The hobs are one of those screwcutting jobs ideally suited
to a
> CNC lathe due to the odd pitch required.
>
> Regards, Paul.
>
>
> On Friday 11 January 2002 2:11 pm, kaynrc wrote:
> > Hi guys. I was going to just ask where I might find some 22.5 degree
> > bevel gears, so that the shafts would intersect at 45 degrees, not
> > the usual 90. I would by FAR prefer to buy them, but, this is a Cad-
> > Cam group, so I'll also ask what you'd do if they can't be found. IE:
> > Make them with a 3 or 4 axis cnc mill?