Powermatic 66 bearing?

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Forum topic by ztifpatrick posted 04-28-2015 09:47 AM 914 views 0 times favorited 2 replies Add to Favorites Watch
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10 posts in 2114 days

04-28-2015 09:47 AM

Hello, looking for some advice, I bought a new PM66 about 9 years ago and have given it moderate use. I really like it and have depended on its reliable accuracy. Recently I was using it with a dado stack and I heard a noise as if the blade had made contact with metal. It hadn’t as the machine was running but i wasn’t cutting anything at that moment . After that it seemed to run a bit noisier but it was only a slight difference. When i took of the dado stack and put my everyday blade back on I noticed it was rubbing ever so slightly on the zero clearance insert. I have measured and checked and it still seems to be parallel to the slots but some how it just doesn’t feel right. I know that’s vague but you know how you get to know a machine? Anyway I started reading up on it and the only thing i can think of is the bearing NSK in the bearing arm? Has anyone any experience with this issue? I looked at the schematic and i see a woodruff key in the arbor shaft, what is that? It seems to be a bit of a job to replace because you have to take to top off and i imagine realign the miter slots to the blade etc. Any advice and pointers would be welcome.


2 replies so far

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4031 posts in 1620 days

#1 posted 04-28-2015 03:56 PM

If you need to replace the arbor bearings, removing the top is the easiest way… I’m not sure it’s even possible without doing so, but it’s pretty easy and only requires removing a few bolts. If you go to the OWWM site, you will find a lot of information regarding the PM66, how to take it apart, restoration, etc… The woodruff key, if it’s the one I think you are talking about, is for the arbor pulley. AFAIK, there were two different designs for the arbor bearing assembly:

That picture was taken from a thread over at OWWM on the restoration of a PM66:

Which should get you started :)


PS: If it’s your arbor bearings that are starting to go, it might be a good idea to go ahead and replace the motor bearings while you at it. With fresh bearings in both, you should be good for at least another decade :)

-- Brad in FL - To be old and wise, you must first be young and stupid

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10 posts in 2114 days

#2 posted 04-28-2015 07:01 PM

Thanks for the info

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