Keyway alternatives for securing motor pulley

mariner3302

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Feb 27, 2015
Messages
104
Hi,
I have got a motor pulley that I have had to make an adapter for to mount to a motor. The motor shaft has a keyway and the pulley had a keyway. I had to turn down the motor shaft from 1 1/8" to 15/16" because the pulley shaft was 1". The motor shaft would only fit 1" down into the pulley so I had to extend the shaft to 3.75". I opened the pulley diameter, which was originally 1", to 1.3" and could open it up about 1/8" more.
So I have got the adapter fitted snuggly to the motor shaft. I am going to attach the adapter to the motor then chuck it up and turn the adapter down to fit the pulley. The pulley is 4 step with the largest being approximately 11".
So the question - will drilling and pinning the pulley and adapter to the motor shaft in 2 places 90 degrees apart be satisfactory to hold it all together. The pin diameter would be 1/4". I would also use red loctite but I am not sure if it is necessary. I could tack weld the pins in place also. The motor will drive the pulley at up to 5000rpm (inverter vector motor) on my Gorton mill.
I don't think I am asking this all correctly so I am open to suggestions. The big question is the balance of the pulley, motor shaft, and adapter. I searched and didn't come up with much and neither did looking it up in the Machinery Handbook.
I am susceptible to overthinking things so any suggestions are appreciated!

OR I could thread the stick out from the pulley end and bolt that up?
 
Last edited:

benmychree

John York
H-M Supporter Gold Member
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Jun 7, 2013
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4,845
Instead of ordinary pins, I use threaded pins in tapped holes.
 

RJSakowski

H-M Supporter - Gold Member
H-M Supporter Gold Member
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Feb 1, 2015
Messages
5,223
Tapered bushings grip firmly enough that a key may not be needed. The pulley would need to have a tapered bore but that wouldn't be too dificultto machine.
 

mariner3302

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Feb 27, 2015
Messages
104
I am thinking of fastening the pulley to the motor in this way. The bolt will be grade 8 and loctited in place. The shaft extension is near press fit on both the pulley and motor shaft. The extension was fit to the motor shaft first. Then I chucked the motor into the lathe and turned the extension to fit the pulley to eliminate as much wobble or runout as I could. I think maybe a pin or threaded pin through the motor shaft and extension and another through the extension and pulley after it is assembled. Or is that necessary?
2020-07-01 16.01.37.jpg
 
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