Quote:
|
Originally Posted by sanddrag
.....
Also, I assume the shape and dimensions of each tooth remain constant across the various tooth counts of a particular gear. Is this true?
Thanks.
EDIT: I called an EDM place and they said it would be something like $35-50 per piece and they could do it in a day. I forgot to ask if there is a setup charge. Would anyone here know? Because I don't want to call back because the guy was very hard to understand and he went on and on forever.
|
Whether or not there is a set up charge is a business by business (and sometimes job by job) thing. But since he was quoting by the piece and didn't mention it, then there probably isn't one. Though it wouldn't hurt to check.
The shape of the involute surface of the gear tooth does vary with changing diameters, but the other parameters (tooth height, addendun, dedendum, etc) remain the same. So you wouldn't want to design a 10 tooth gear and then just copy that tooth for a 60 tooth gear.
The interesting thing is that for conventionally made gears, you only need one hobb per pitch. All gears of a given pitch can be made from a single hobb, which is fairly straight forward to design. One instance where the old way might really be easier.
If your laser guy says he can cut it, and he isn't charging you, then I'd have him do it first. If he really can't produce what you need, what have you lost? But you're sure to learn something in the process.
ChrisH