Pitch angle thread
Pitch angle thread
(OP)
Hello
I have an impeller connected to a shaft (threaded)
if I want to disconnect the impeller ,it stuck to the shaft, because of the torsion the impeller produced.
Now I want a new connection, and want to increase the pitch of the thread, so the impeller won't stuck again if you disconnect it.
Anyone an idea how to calculate this pitch?
I think it could be calculated by a formula without the forces on the shaft in it..
I just need a pitch angle
it doesn't need to be a standard..
Greetings Gj





RE: Pitch angle thread
Read up on self locking worm gears. This should be written up in your machine design textbook, along with the required math.
The whole point of screw threads is that the pitch angle is self locking. I think you need a few way to connect your impeller. Does your current design have adequate wrenching flats?
RE: Pitch angle thread
RE: Pitch angle thread
RE: Pitch angle thread
RE: Pitch angle thread
Is this a commercially available pump? Was it rebuilt with bootleg or otherwise non-OEM parts?
What are the manufacturer's instructions for removing the impeller? They may have tools available to allow applying sufficient torque or even some impact necessary to remove the impeller that has been subjected to normal operation.
Taper fits sometimes require impact or shock to remove.
RE: Pitch angle thread
Left hand threads are not uncommon.
Mike Halloran
Pembroke Pines, FL, USA