I have a customer whom I supply a shaft, on the end of the shaft is an M65 x 1.5 4h thread. Now the customer messed up because the next diameter over is the bearing journal and the major diameter of the external thread is the same size as the bearing journal.
Now, here's the request, change the thread to M65 x 1.5 6g. I've always been under the impression that the class of fit was just another way to tolerance a thread. So, here's what the Machinist Handbook says. A 4h fit is to make the thread to mean, but the 6g says the root can be up to -.032mm and the major diameter had ~.080mm more tolerance.
The customer says this will allow the bearing to fit over the top of the thread without damaging the threads. Can that be true? If I buy a die to 6g, to chase the threads that I've already made, will the die remove material from the O.D.?
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