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Locking a screw thread?

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John Hill:
I am building my cnc router table to use roller chain drive for the long axis and there is a need to anchor screwed bicycle sprockets to shafts.

The thread is 1.37" 24tpi.  The shaft will reverse in operation and I really, really, do not want these sprockets to come unscrewed,  what suggestions can I have please?

Thanks 

NeoTech:
Make a collet with set screws that goes in to the thread, or try to create two jam nuts?

awemawson:
Bore the thread off, and either weld or loctite a suitable hub for your shaft

chipenter:
For a fixed wheel sprocket there used to be a locking ring available , if not turn down another sprocket as a lock ring .

RussellT:
In my experience it's a waste of time trying to bore the thread off or trying to turn another sprocket down.  They're very hard.

Make a plain unthreaded close fitting hub and weld the sprocket on.  Take your choice of how to fix the hub.

Russell

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