How to cut worm gear

[Rakesh]

Hi everybody

I never cut the worm gear on cnc lathe and now I have to do in one of the job. Please help me how I can program and what type of holder-insert will be required. Here is the data : 24 diametral pitch,worm lead & lead angle quad( I guess it mean 4 start),Lead .5236",Lead angle 18 deg 26 min,Right hand,outside dia 0.5833, Pressure angle 25 deg

I know there must be many help who did cut the worm on cnc and I need the help to do this job.

Any help will be appreciated.

thanks

[Matthew Hajicek - Singularity]

I believe you would need a special insert with the tooth profile.

[John Summers]

The addendum = 1/dp = .0417, so the pitch diameter is OD - 2*addendum = .5625.

Here is where the tooth thickness and space thickness are the same. The pitch is pi/dp = .1309. This would be the sum of the tooth thickness and the space width at the pitch diameter, so the space thickness here is half that, or .0654.

I'm sending you a picture.

[John Summers]

Sorry, the pitch diameter is .500. Somewhere, I pushed the wrong button.

[Rakesh]

I just want to add up more information.

Some body did this worm on cnc lathe, so it is possible.

secondly as per customer told me that insert have to grind so to have 25 deg per side to meet 25 deg persure angle critiria. Than he said that holder also have to give some angle too.

I know 4 start path mastercam can give.

I hope this little more information will be helpful.

[John Summers]

I sent you a new file showing the toolbit and the tilt of the toolbit.