Helical gear cutting-tools

[PJPickard]

This is great George, thank you. About Ivan Law's book, I recall reading(somewhere!) that the book has some errors in it. Do you happen to know what they are?

Thanks!

[internal_fire]

At the top of page 106 there are two equations that contain "sin" functions. Those should be "cos" functions instead.

Law was using 45 degree bevel gears as an example, so the error did not give an incorrect result.

Gene

[nj111]

Thank you George,
This is all very useful information!
Nick

[Mike R]

How about this Chris. I'm not an electronics guy but someone who is could use an Ardino like they did for the rotary table drive with stepper motor.

On another forum someone made an arduino driven attachment to cut helical gears, but is using a gear hob to do the cutting.



https://www.homemodelenginemachinist.com/threads/vw-beetle-1-4-scale-motor-model.37873/#post-437054

[gbritnell]

Even if a horizontal rotary table with ardino was used it would need to be synchronized with the X axis of the mill. You have to advance and rotate at the same time. The milling head would also need to be tilted to match the helical angle. Seems like a dedicated motorized fixture would be the way to go but then its like making a cam grinding fixture. By that I mean for the time spent how many helical gears or camshafts is one person going to make?

[crueby]

Good point! And you can print the templates really cheap.