To find better materials for the ratchet and pawl, I made this test fixture from a 25 rpm gearmotor. Initially the ratchet is 642 bronze and the pawl is 6061T6 aluminum. I expect the aluminum to wear quickly. May try bronze pawl next.
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fascinating test engine. wanted to make an observation regarding bronze
ratchet: i field tested a bronze ratchet vs a mild steel pawl and found wear on it
that was visible to the naked eye after just a few minutes of twisting both in- and outbound.
have switched to a stainless steel ratchet and so far have found no wear.
Do you recall the bronze alloy? They do cover quite a range, from sintered grades to material for IC engine valve guides.
In a reply on Clarke’s Forum, Fred says he first tried “Tobin Bronze”. Google search results agree that this is the same as Naval Brass, C464.