Need help with Powermatic Model 50...please

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Forum topic by David211 posted 04-29-2015 01:04 PM 633 views 0 times favorited 7 replies Add to Favorites Watch
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3 posts in 548 days

04-29-2015 01:04 PM

Hello. I recently bought a Powermatic model 50 joiner. I put new knives on right away. Everything appears to be original. The problem is it chatters so bad I can’t use it. Motor is 3/4 Hp. One thing that does look out of sorts, to me anyway, is the lower pulley on the motor is the same size as the upper pulley. Both pulleys are exactly the same…manufacture and everything. I need this piece of equipment up and going and hoping someone can help. To me it acts like the cutter head isn’t spinning fast enough therefore causing the chatter. Thank you in a advance for any assistance. Dave

7 replies so far

View Bill White's profile

Bill White

4408 posts in 3385 days

#1 posted 04-29-2015 01:38 PM

Same size pulley means that the head is turning at the same speed as the motor. BAD! The cutter head pulley should be smaller than the motor pulley. Not having a jointer means that I can’t help with sizes, but someone here should be able to help. If not, contact Powermatic. You could also look for an owners manual on line.


View SirIrb's profile


1239 posts in 655 days

#2 posted 04-29-2015 01:58 PM

page 9 of the owners manual shows that they are different sizes.

This may help too.

-- Don't blame me, I voted for no one.

View Shadowrider's profile


183 posts in 633 days

#3 posted 04-29-2015 02:01 PM

This might help. Pic #93 in the slideshow.

How much are you taking per pass?
If you pulleys are the same the cutterhead will be spinning the same speed as the motor. Is it running at it’s stated RPM?

View Nubsnstubs's profile


813 posts in 1154 days

#4 posted 04-29-2015 02:02 PM

I have a PM50. Top pulley is 2 1/2” and at the motor, it’s 3 1/2”. If the knives are installed properly, it should still cut without chatter, though a little slower.
Once, I set my knives, and the tension bar? between the screw and knives wrong, and was getting wood chunks wedging in the gullets. It made a lot of chatter until I reset the bars properly. One edge of the bar is square, and I believe the other is slightly dished. Also, I believe the screw sockets on the bar are not centered, so take into consideration how it comes off… If you aren’t confused by now, you won’t be…........ Jerry (in Tucson)

-- Jerry (in Tucson)

View David211's profile


3 posts in 548 days

#5 posted 04-29-2015 11:47 PM

I want to thank each of you guys for taking time out of your day to help me. With your help the problem is solved. I turned to this forum last night on a whim to see if I could get some help and it sure paid off.

View Nubsnstubs's profile


813 posts in 1154 days

#6 posted 04-30-2015 12:23 AM

Well?? What was the problem?? Jerry (in Tucson)

-- Jerry (in Tucson)

View David211's profile


3 posts in 548 days

#7 posted 04-30-2015 12:43 AM

Jerry, you were right, I had not set the bars properly. Thank you for the help.

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