motor sprocket key

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1950EL
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motor sprocket key

#1

Post by 1950EL » Wed Apr 27, 2011 1:02 am

Is there a right or wrong side against the shaft when placing the motor shaft sprocket key on the shaft? I'm having trouble getting the new sprocket on far enough wondered if it matters which way the moon side faces. I have never put a new sprocket on my tapered shaft before and just replacing the same used one was never a problem. Shaft seems smoothe. New sprocket seems almost .020" smaller than the old sprocket on the small end, same size on the large end. I don't recall ever hearing this discussed. Thanks. Mike



jdpan
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Re: motor sprocket key

#2

Post by jdpan » Wed Apr 27, 2011 1:46 am

I've always installed them with the moon side against the shaft because I believe the cuttout on the shaft has a slight radius to it..

Dave_R
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Re: motor sprocket key

#3

Post by Dave_R » Wed Apr 27, 2011 1:30 pm

Just to add...

for new parts..... I usually use stuff like blueing inside the sprocket and install it without the key first and rotate the sprocket against the tapered shaft a little. See where the new part hits, and adjust (light grind or file) so that it sits square with the entire taper as much as possible.

Then, install the key and do the same (Except the rotating part). A lot of times I have had to file down the face of the key slightly to get the full contact of the taper.

I used to have a lot of issues on "shearing" these keys before I did the above.

-Dave

1950EL
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Re: motor sprocket key

#4

Post by 1950EL » Thu Apr 28, 2011 12:20 am

Thanks to both of you. I didn't see any way it was going on without some grinding but I didn't want to start that and then find out I was overlooking something. I'll take comfort in knowing I'm not the first to have to do that. The key logic sounds right as well. Mike

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