Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Once I got it in my head that I need a brass pulley for the governor on the crankshaft, I had to get er’ done.   

I had a 3/16 crankshaft hole brass pulley laying around, and the Stuart crank shaft is 1/4”.    Radther than order one online and pay $40 for a small pulley I went ahead and did it myself!

Picked up some more drill bits made from titanium.  Instead of going straight to 1/4”, I stepped it up through 13/64, 7/32, 15/64, and finally 1/4”.    This allowed me to drill slowly and use a hand drill and a vice.  Used some machine oil to lubricate the bit as drilling. 

Once drilled, I cleaned up the bore of pulley with some sand paper on a screw driver back and forth until I got a clean fit over the Crankshaft.   

This pulley is either 2.5:1 or 3:1,  spins that governor perfectly now.  When a load is applied to the crankshaft, the governor acts accordingly.

It also looks great against all the other brass and gun metal.


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Here is a YouTube video if interested.
https://youtube.com/shorts/AX561MaJHL0?si=nEktV8USpm5MTdoS