Planer and Jointer knives leaving grooves

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Forum topic by Manitario posted 12-08-2010 06:01 AM 6283 views 0 times favorited 5 replies Add to Favorites Watch
View Manitario's profile


2653 posts in 3056 days

12-08-2010 06:01 AM

Topic tags/keywords: planer jointer question

I’ve had my planer and jointer for two months, I have maybe run 150ft of wood through each. They were both working great a few weeks ago, leaving a silky smooth finish on the wood. I went away for the past 3 weeks on business and when I got back a couple of days ago and started using each, they are leaving small ridges in the wood parallel with the jointing/planing direction. Looking at the jointer knives, there appears to be several small areas where the edge has divots in it; I’m assuming the planer blades have the same defect. I don’t understand how this happened when I wasn’t using the machines for 3 weeks. unless it is due to the temperature change in my shop (last few weeks temps have been swinging between -10C at night and above zero in the daytime. Anyone else have problems with their jointer/planer blades like this? It doesn’t look like rust, and none of the other tools have rust on them, and the blade sets were brand new 2 months ago. BTW; the planer is a General International with 3 blade cutter head, and the planer is a Dewalt 735.

-- Sometimes the creative process requires foul language. -- Charles Neil

5 replies so far

View closetguy's profile


744 posts in 4065 days

#1 posted 12-08-2010 06:15 AM

You have a small chip in the blades. Loosen one of the blades and slide it left or right just a little.

-- I don't make mistakes, only design

View ajosephg's profile


1880 posts in 3734 days

#2 posted 12-08-2010 06:37 AM

It’s one of those things that just happens.

-- Joe

View wseand's profile


2796 posts in 3215 days

#3 posted 12-08-2010 06:47 AM

Yea, I have the same problem with my 735. Mine came from a knot when I put a knotty piece of wood through. Great idea to just move one blade over a bit, I will have to do that.

View Jim Jakosh's profile

Jim Jakosh

21520 posts in 3279 days

#4 posted 12-08-2010 01:56 PM

The raised portion is from a nick in the keen edge of the knife. Hard spots in wood or inclusions- like grit in the pores will put a nick in ‘em real quick. I think sometimes if you sand a piece of wood and then run it through the planer the sanding grit could do that . I ran just a little Koa wood from Hawaii through my jointer and planer and it took the blades out of both of them. It is known for inclusions. Mesquite is another wood that has inclusions. Before I changed my blades , I used a wood scraper to remove the high ridges before using the wood. On some planers you can shift one blade sideways so all the nicks dont line up and the planer will cut smooth again. Mine has a fixed location and I can’t do that- so I flipped the blades.

Good luck…........Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View AaronK's profile


1507 posts in 3637 days

#5 posted 12-08-2010 02:43 PM

mine has so many of those i just ignore them! the planer is only used for stock prep after all, not a finished surface, since even the best one will leave little scallops.

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