Bevel Gear Cutting With Involute cutters

[Dan Rowe]

I am assuming that the skewed gear can be cut using a simple indexing head, and the spiral gear needs a connection between the indexing head and the mill table feed?

Pat,
A straight tooth parallel depth bevel gear can be cut with the mill and an indexer. The skew version just makes the math and the set up a little harder.

Gears with curved teeth have to be geared or guided some way to get the curved tooth flank. Here is a brilliant method to make helical gears with the lathe:
http://www.homemodelenginemachinist.com/index.php?topic=9916.0

Gordy,
The site Ian linked says it requires the copyright permission to be obtained before uploading any material. It is not possible for the end user to know if this was actually done or not. The cost of the membership to the site is more than a new copy of the book so for me it was a no-brainer.

Dan

 

[John S]

Skew gears and spiral bevels are the bevel equivalent of helical gears instead of spur gears.

With spur gears the load is taken by one tooth and passes onto the next, in a good design the following tooth takes over the torque before the first tooth lets go, with a helical gear the process is gradual giving a smoother and quieter drive but ironically , not as strong as the load is always shared.

Skew and spiral bevels are the same in that they share the load for a smoother and quieter drive.

Skews are still straight bevels but cut at an angle, spiral bevels are cut on an arc which makes them very hard to do in the home shop or even a small gear shop for that matter because of the complex setup and drives needed for this tooth form.

You can cheat if you have CNC ;D

[ame]http://www.youtube.com/watch?v=RV8Dq6mslnE[/ame]

John S.