Sharpening jointer blades

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Forum topic by MrRon posted 01-08-2015 07:39 PM 1141 views 0 times favorited 1 reply Add to Favorites Watch
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4764 posts in 3240 days

01-08-2015 07:39 PM

Topic tags/keywords: question

My Powermatic jointer manual says you can sharpen blades without removing them from the machine by placing a sharpening stone on the outfeed table and moving it from side to side while the machine is running. Has anyone ever tried it? If it would work for a jointer, what about a planer?

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810 posts in 1900 days

#1 posted 01-08-2015 09:05 PM

The process is called jointing the knives. Where a flat is created on the very tip of the knives. This flat can only be not more then 1/32”, then the knives must be ground again.
On a planer with grinding attachment, after the knives are ground, a stationary stone is attached, then traversed along the “running cutter head” to establish the flat-and bringing the knives to exact height.
If the jointing has gone too far, the knives will begin to rub instead of cut.
On a jointer a stone is moved across the running cutter head by hand. There are those that still do this.

Of course, this is somewhat dangerous thing to do, and needs full attention!
But, it is a way to get exact even knife height on a planer or jointer without an expensive dial gage…and a quick way to touch up the edges between full grinding.

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