Cutting a Keyway into Motor Output Shaft

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Thread: Cutting a Keyway into Motor Output Shaft

  1. #11
    Join Date
    Sep 2013
    Location
    Waldo Wi
    Posts
    941
    a good hardware store tap like a Hanson will cut fairly easy, the crank is cast iron so if pilot hole is right for the tap your good. go a turn or two and back it out etc..

  2. #12
    Join Date
    Feb 2013
    Location
    shenendoah valley,va.
    Posts
    2,627
    if you had any extra shaft sticking out past the clutch, 1/2'' ? you could use a 2 piece clamping collar on the shaft. otherwise, maybe drill the hole on the motor shaft hole 1/4 '' or 3/8'' diameter.take a grade 8 bolt that size, cut the head off and then cut the smooth part of the bolt long enough to fit into the hole so the threads stop at the end of the motor shaft. then drill thru the motor shaft and bolt and secure with a roll pin that is ground flush with the shaft. now you have a threaded bolt to put washers on if needed and a lock nut to secure the clutch on. just make sure you use a long enough bolt to stick out far enough with threads. maybe this will help ... let us know or maybe someone has a better idea. johnboy va.

  3. #13
    Join Date
    Feb 2016
    Location
    Mississippi
    Posts
    1,108
    Garret forgive me if I'm telling you things you already know, but you have to use exactly the right size drill bit to correctly tap threads. To tap a 3/8 hole, you do not use a 3/8 drill bit...use a 21/64. If you used a bit that is too far undersized, it's going to be really tough to cut the threads because you will be trying to remove too much material.
    Also, make sure you are not using a bottoming tap. A bottoming tap is designed to cut closer to the bottom of a blind hole. A standard tap has more taper and starts easier when cutting threads. Also, make about a 1/4 turn cutting and back out a 1/4 turn then cut another 1/4 turn and back out 1/4 and so on until you reach the bottom of the hole. Keep the tap oiled, even if its just motor oil. Finally, if you have a T handle tool, use it. If you are using a crescent wrench or something like that it's hard to keep a tap straight. The T handle will keep you from torqueing the tap to one side.

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