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

Hi Ray:
Good suggestion but with a couple of caveats.
There aren't too many wire EDM's out there that can handle such extreme
tapers.
Charmilles is the only one I know of.
The programming will be EXPENSIVE!!!!
If you can do it yourself you will save a bundle, but you need access to the
right software.
The gears will be the most accurate you will ever see, but the surface
created by the EDM process is a poor surface for wear.
The EDM process also creates a recast layer and a heat affected zone; the
recast layer is typically full of microcracks which can propagate and lead
to early failure of the gear.
The most modern power supplies can minimise the recast; look for a high end
machine less than 3 years old.
You will still have the other problems to overcome.

I'd cut them with a flycutter using the parallel tooth method on a milling
machine.
Cheers

Marcus

----- Original Message -----
From: "Raymond Heckert" <jnr@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, January 12, 2002 11:12 PM
Subject: Re: [CAD_CAM_EDM_DRO] Buying or CNCing some odd angle bevel gears.
I'm stuck !!


> kaynrc:
>
> I'd guess the "odd" gears would be ideally suited for 3-D EDM wirecutting,
> if you don't need something "too" precision. You'll need to supply
> whatever pressure angle you're working with, and the pitch, but the modern
> machines ought to be able to produce what would pass for an involute form.
> Maybe locate a Tech School where they teach EDM Machining, and try to get
> one of the students to have a go at it. It's (drawing on Tech-School
> resources) commonly done here, stateside.
>
> Best regards, Ray H