Posted by gearhead1 on April 02, 2013 at 11:35:54:

In Reply to: Re: Hobbing Prime Spurs using differential posted by Bill Simpson on March 29, 2013 at 12:23:46:

Bill,

Thank you for the comments. Something is not working for me there.

My thinking here is that I could basically use teh Barber Colman method of calculating new index gears to affect a right hand helical gear and then calculate the necessary lead gears for the differential to affect left hand helical hobbing, and the result being that they offset.

Is this not correct?

Where I am confusing nmyself, is on the page you point out, and the "extra" calculations required.

Plus, it appears there is les than stellar information on the machine I'm using. Koepfer 173.

I know the machine's index constant is 7.5.

I believe the feed constant is 1.25, as it is expressed as Feed/.8.

Where it gets more confusing is that the differential lead gears are supposedly Feed/cos of Lead Angle.But the diff's ratio is 2:45. (??????)

Ideas? Thoughts?

- Re: Hobbing Prime Spurs using differential
**BillS***08:12:57 04/04/13*(5)- Re: Hobbing Prime Spurs using differential
**gearhead1***09:25:48 04/04/13*(4)- Re: Hobbing Prime Spurs using differential
**gearhead1***09:34:21 04/04/13*(3)- Re: Hobbing Prime Spurs using differential
**BillS***10:32:24 04/04/13*(2)- Re: Hobbing Prime Spurs using differential
**gearhead1***12:39:12 04/05/13*(1)- Re: Hobbing Prime Spurs using differential
**BillS***17:37:37 04/05/13*(0)

- Re: Hobbing Prime Spurs using differential

- Re: Hobbing Prime Spurs using differential

- Re: Hobbing Prime Spurs using differential

- Re: Hobbing Prime Spurs using differential

- Re: Hobbing Prime Spurs using differential