Planer knife calibration question

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Forum topic by Rink posted 05-24-2018 04:19 AM 445 views 0 times favorited 3 replies Add to Favorites Watch
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196 posts in 815 days

05-24-2018 04:19 AM

My cutterhead (13” Jet planer) seems to be a few thousands of an inch higher than the table surface on one side than the other. I don’t see any easy way to fix that.

So, I’m thinking that I should align the knives to the table surface and not to the cutterhead. Does that sound right?

Or… if anyone knows how to align the cutterhead to the table I’d like to hear it!


3 replies so far

View Rink's profile


196 posts in 815 days

#1 posted 05-24-2018 04:39 PM

For anyone that is interested….

I called Jet and spoke to tech support about my JPM13. He gave me two options:

1 – Don’t worry about the .005” or so difference from one side to the other, and align the knives either to the cutterhead or to the table (he seemed to prefer alignment to the cutterhead).

2- Realign the table to the cutterhead. Underneath the table, I would loosen the sprocket holding the chain to the screw the raises and lowers the table, raise (or lower) one side, and then tighten the sprocket again.

I’m going to see how complicated #2 looks, and #1 is the fall back option.


View Holbs's profile


2346 posts in 2807 days

#2 posted 05-24-2018 10:26 PM

it has been awhile since I did my 15” jet planer. Let’s see… 2 dial indicators to measure knife height relative to the cutter head. And then, 2 dial indicators to measure cutter head to table. 2 separate measurements. Heck, while you are at it, a 3rd measurement of the 2 feed rollers in the table.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

View Rink's profile


196 posts in 815 days

#3 posted 05-25-2018 03:59 AM

Thanks, Holbs. I actually worked on this tonight. I picked option #2 and it turned out to be easy, peasy. Well it was easy after I failed a couple of times. I got the cutterhead parallel to the table within a couple thousands of an inch. Close enough for me. Then I used a dial indicator sitting on the table to set the knives, also within a couple thousands of an inch. After I got it that close, my patience failed me. Now that I’ve used this method, I think it will go faster next time.


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