Posted by Bill S on July 29, 2003 at 13:39:40:
In Reply to: Re: Cutting Spur Gears with a Shaper posted by John Stevenson on July 14, 2003 at 03:37:20:
Hi John,
The article you have on a shaper setup to cut gears is fascinating. Thanks for sharing it on the forum. BTW, we're talkin' a *table* shaper here, not a Fellows gear shaper.
I would note that the pitch circle disk diameter used with tension wires should be reduced by the diameter of one tension wire, i.e.
diameter of disk = Pitch diameter - wire diameter
for anyone wanting to try it. Not a large effect for a large pitch diameter and small wires, but could be significant for small PD's.
Also, the index gear used to index from tooth to tooth should be a quality gear with little tooth-to-tooth error.
The cutter would cut a range of pitches as long as its rack form sides can go fully into the tooth space. Cutting too deep with a "sharp" cutter is not a problem unless tooth strength is critical.
Normally, cutter point width should be proportional to the depth of cut or inversely proportional to Diametral Pitch.