Helical Gear Cutting Attachment

cfellows · Jul 11, 2012

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 · Aug 28, 2018

Thank you Sir !

Gonzalo · Aug 31, 2018

Thank you very much!!!

Stefan-K · Nov 8, 2018

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 · Nov 10, 2018

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

tornitore45 · Nov 11, 2018

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 · Nov 11, 2018

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

Wrecks · Nov 12, 2018

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 · Nov 12, 2018

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 · Nov 12, 2018

Wrecks said:
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/

Helical Gear Cutting Attachment

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