Helical Gear Cutting Attachment

[cfellows]

These are dawings and descriptions of a helical gear cutting attachment I made for my lathe.? It is mounted in a vertical milling vise on the cross slide and the gear cutter is mounted in the spindle.? Different lathes might require different mountings for the attachment.

View attachment HelicalAttachment.pdf

 

[Michel_Mike_Chaput]

Thank you Sir !

 

[Gonzalo]

Thank you very much!!!

 

[Stefan-K]

Thanks for the plan Sir.
Is it possible to add some Pictures or a Video to See How the attachment works.? I just can't get an imagination.

Regards Stefan

 

[dethrow55]

nice job. was wondering if theres a simple formula for doing worm gears using 1/2 acme thread rod as hob ?

 

[tornitore45]

Pitch diameter = Number of Teeth X Threadsperinch / pie
Blank OD = Pitch diameter + Thread Depth
It is better to gash the blank first otherwise the hob may not self drive the blank with the correct pitch

 

[dethrow55]

thanks tom im here in el paso tx. used to live in austin tx back in the 80s beautiful town.

 

[Wrecks]

I understand that you don't use the same tooth form for a helical gear as you would for a spur gear. For example, (somewhere, I can't find it right now) there is a video of this attachment in use, and the poster stated that he was using a 35 tooth spur gear cutter for a 14 tooth, 45 degree helical gear. Can anyone point me to how one picks the tooth form of the cutter?

 

[Wrecks]

I found the answer at https://johnfsworkshop.org/home/mak...-helical-gears-on-a-vertical-milling-machine/.

It's Cutter Teeth = Actual number of teeth divided by the cosine of the helix angle cubed.

Great article there, but this attachment looks like it would make the job way easier.

 

[shipshape]

I understand that you don't use the same tooth form for a helical gear as you would for a spur gear. For example, (somewhere, I can't find it right now) there is a video of this attachment in use, and the poster stated that he was using a 35 tooth spur gear cutter for a 14 tooth, 45 degree helical gear. Can anyone point me to how one picks the tooth form of the cutter?

Hi
Have a look: https://www.homemodelenginemachinist.com/threads/helical-gear-cutting-lathe-attachment.9199/