Thread question

[JMahon]

Double lead acme, 10mm pitch, I think maybe 4-5mm major...

 

Is it possible?

 

In plastic... No gage check, must be split and cmm'd.

[Greg Williams]

yes, lathe or mill?

[JMahon]

Robodrill

 

Internal

[JMahon]

Bumping this up.

Anyone have any experience with this? We sent a print to our tool grinder n they said it can't be done!

[crazy^millman]

Jim 10mm Pitch on a 4-5mm diameter? The pitch is 2 times the diameter? I would have to agree that would be almost impossible to even do. I was thinking about the slope of the acme and not even sure how that would even work. I have cut some 4 lead Acme thread recently and they were very aggressive, but not 2 times the diameter of the part I was cutting. Can you have the customer verify exactly what they want.

 

Part I did was 37mm diameter with a 1mm Pitch on a 4 lead. So they ratio of the Pitch to the diameter on this part was. 37/4 and if it had to be 37/64 not even sure how I could have cut it.

[JMahon]

This is all been information thru our engineers.  We are supposed to have a model/print later today...

 

I even thought about maybe broaching it with a 5 axis curve...?

 

Thanks for the input guys.  Hopefully ill have more info in a little bit.

[JMahon]

Ok I got some more info...10mm was the lead, not pitch.

 

Its 3.2mm major, 2.35mm minor.

 

5mm pitch, 10mm lead.

 

1.92mm major land, 2.77mm minor land.

 

7mm depth.

[JMahon]

Ok so we've had 2 grinders say that its impossible using a threadmill.

 

So I'm thinking about broaching with a 5 axis toolpath... now its getting tricky lol.

 

Has anyone done anything like this in mastercam?

 

I was thinking getting creative with 5 axis curve or swarf should get it done....?  Thoughts?

[Matthew Hajicek - Singularity]

Well, you could make the negative in steel and broach / tap it in one go.

[JMahon]

I will give that a shot... never made any custom taps before.

 

I like trying new things so here we go!