Sharpening jointer and planer knives freehand

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Forum topic by TheWoodenOyster posted 05-31-2015 02:46 AM 991 views 0 times favorited 5 replies Add to Favorites Watch
View TheWoodenOyster's profile


1317 posts in 2078 days

05-31-2015 02:46 AM

Topic tags/keywords: sharpening

I decided to pull out my planer knives and sharpen them today. I don’t have a jig, nor do I want to buy or make one, nor do I want to ship these things off and pay to get them sharpened. Based on that, I just sharpened my planer knives freehand today with my DMT stone up to 1200. I haven’t put them back in the planer yet, but they feel much better and are free of the gunky buildup. I know “technically” I could make the edge wavy by doing this, but it can’t me any more than a thousandth or two, so I’m not too worried.

Is this a cardinal sin?

Do any of you sharpen planer/jointer knives freehand?

-- The Wood Is Your Oyster

5 replies so far

View joey502's profile


544 posts in 1661 days

#1 posted 05-31-2015 03:23 AM

I don’t think sharpening them freehand is the best idea.

The knives in my jointer up to this point have been new. A set of 6 1/8” knives for mine is less than $18 shipped from Holbren. I will send the dull sets out one day to have them sharpened.

View bobasaurus's profile


3531 posts in 3327 days

#2 posted 05-31-2015 04:24 AM

Give it a try and see how they work. If you have a dial indicator jig, it would tell you if how out of flat they are after installation. I plan on doing something similar with my knives soon.

-- Allen, Colorado (Instagram @bobasaurus_woodworking)

View bigblockyeti's profile


5222 posts in 1863 days

#3 posted 05-31-2015 05:24 AM

If it works well, go for it and if you notice them getting a little wavy, send them out every third or fourth sharpening to true them up again.

-- "Lack of effort will result in failure with amazing predictability" - Me

View TheFridge's profile


10275 posts in 1629 days

#4 posted 05-31-2015 05:51 AM

I grind em myself with a home made jig and diamond stone em.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View mahdee's profile


3991 posts in 1910 days

#5 posted 05-31-2015 01:07 PM

I have a very simple jig (small section of 2×4) that I use to place the blades in and sharpen them by hand.


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