Setting new planer knives...

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Forum topic by grub32 posted 07-08-2012 02:02 AM 1364 views 0 times favorited 5 replies Add to Favorites Watch
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215 posts in 3043 days

07-08-2012 02:02 AM

Topic tags/keywords: jig planer knives

I have been wanting new planer knives for some time now and I finally bit the bullet and spent 150 on the new blades. I made a few set blocks to ride on the top of the planer to reference the knives on both sides. It seems that I made them too short and the blades are about 1/8 of an inch higher than the old blades. Is that ok if they are all consistent and the gib nuts are tight?

Here you can see the shiny edge is the blade bevel and to the right is the 1/8 inch protrusion.


you think I should make a new jig? Reset them again?

Is there a better way to do this without buying those poorly reviewed magnetic jigs?

I should probably mention this is onan old powermatic 15 with straight blades.

I appreciate any and all help,


-- Educator by Day, Wood Butcher by Night!!

5 replies so far

View AHuxley's profile


653 posts in 3316 days

#1 posted 07-08-2012 05:02 AM

First they should be level at top dead center with the outfeed table. Get a sheet of float glass and glue rare earth magnets on the back and it will hold the knives level just like the jigs you buy.

BTW a quality set of 3 15” planer knives for that PM should run about $50 shipped…not NEAR $150!

View Fred Hargis's profile

Fred Hargis

4981 posts in 2488 days

#2 posted 07-08-2012 10:15 AM

You could try it that way, but it seems to me that if they are 1/8” higher than the old ones (assuming the old ones were set correctly) they are way too high. Think of it this way: the planer will now be cutting 1/8” off each pass more than it was at the same height setting. The infeed roller as well as the outfeed roller will be incorrect for the depth the knives are cutting. If you choose to try this do so with the lightest of cuts at first, and you might want to use some 2X stock for the test.

-- Our village hasn't lost it's idiot, he was elected to congress.

View grub32's profile


215 posts in 3043 days

#3 posted 07-08-2012 11:35 AM

AHuxley….this is not a jointer, it’s a planer. I can’t reference the outfeed table.

Everywhere I looked, they were super expensive…regardless of price, I am going to rebuild my jig to reference the cutter head and make it fit factory settings.

Fred, thanks for the reminder about the rollers, this would take an extra 1/8 inch bite and bog down the planer, 3hp or not.



-- Educator by Day, Wood Butcher by Night!!

View Lee Barker's profile

Lee Barker

2170 posts in 2845 days

#4 posted 07-08-2012 01:00 PM

Throw the jig away; you want the knives to be set properly. There is likely a spec for that in the owner’s manual.

BTW, I have a pair of Magna-Sets and I think they’re sliced bread. I double check with a dial indicator after I’m done and it’s always right on. Grizzly 15” planer.

I Googled and found a set for $119. Ok, I know you’re just woodworking at night and teaching during the day, but consider your non-woodworking hours fussing with this and balance that against the $120.



-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View MedicKen's profile


1615 posts in 3457 days

#5 posted 07-08-2012 01:49 PM

Here is how I do it.

-- My job is to give my kids things to discuss with their

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