Need help with Powermatic Model 50...please

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by David211 posted 04-29-2015 01:04 PM 998 views 0 times favorited 7 replies Add to Favorites Watch
View David211's profile


3 posts in 1123 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

4931 posts in 3960 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 1230 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 1208 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


1287 posts in 1729 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 1123 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


1287 posts in 1729 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 1123 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.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics