Jointing plywood

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Forum topic by MrRon posted 02-02-2012 12:28 AM 2371 views 0 times favorited 15 replies Add to Favorites Watch
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3446 posts in 2282 days

02-02-2012 12:28 AM

I’m wondering if it is OK to joint the edge of plywood or will it damage the knives?

15 replies so far

View Elizabeth's profile


811 posts in 2182 days

#1 posted 02-02-2012 12:30 AM

I read an article not too long ago that didn’t recommend it:

View crank49's profile


3877 posts in 2010 days

#2 posted 02-02-2012 12:41 AM

Rule of thumb is, if it’s man made, no.
So that rules out plywood, MDF, Masonite, etc.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

View cabmaker's profile


1399 posts in 1848 days

#3 posted 02-02-2012 12:43 AM

Glue will dull the knives rapidly but just a now and then deal youll be ok. Even frequent use would be ok if neccessary. Just need more frequent sharpening and setup but that is easy enough. Have at it

View jjempson's profile


198 posts in 2027 days

#4 posted 02-02-2012 12:45 AM

dear MrRon planing ply is more than except-able on a jointer and you can achieve a good finish…But it is best to only use one side of the blade…if you keep the section nearest the guard/furthest away from you just for man made boards…leaving the rest of the blade for premium quality for hard/soft wood….this way only a small piece is worn..
hope this helps

-- jjempson

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3446 posts in 2282 days

#5 posted 02-02-2012 01:04 AM

Thanks for the replies and answering my question.

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Rick Dennington

4500 posts in 2233 days

#6 posted 02-02-2012 01:52 AM


I have jointed plywood before several times, and it can be done….didn’t hurt my blades any….I haven ‘t did a lot, but I have did it…..go for it…..

-- " I don't makes my coffee spill...."

View DS's profile


2141 posts in 1459 days

#7 posted 02-02-2012 01:53 AM

Here’s a TIP if you decide to joint the plywood. Make a releif cut on the heal of the board first so the cross grain plys don’t tear out when you make the full pass.

Just like jjempson, I use the far edge of my blade for riskier cuts, then move my fence forward for the cleaner stuff.

-- "Hard work is not defined by the difficulty of the task as much as a person's desire to perform it.", DS251

View NBeener's profile


4808 posts in 2213 days

#8 posted 02-02-2012 01:54 AM

Yeah. I’ve both jointed AND planed ply, but I try not to make a habit of it.

I think it’s put together with epoxy, and THAT’s the big issue. Hard on blades.

-- -- Neil

View dannelson's profile


172 posts in 1410 days

#9 posted 02-02-2012 03:34 AM

get that cnc built and use it for jointing. these machines work great for this I dont use my jointer anymore for 90deg only if I have to bevel.

-- nelson woodcrafters

View doncutlip's profile


2832 posts in 2595 days

#10 posted 02-02-2012 03:39 AM

I too have done it before, not much of a cut but I don’t see any problems with it.

-- Don, Royersford, PA

View Dusty56's profile


11777 posts in 2727 days

#11 posted 02-02-2012 03:43 AM

Yes , I’ve jointed the edges safely as well. Not a lot , but more than once : )
I would NOT run it through a planer though !

-- I'm absolutely positive that I couldn't be more uncertain!

View canadianchips's profile


2123 posts in 2036 days

#12 posted 02-02-2012 03:56 AM

Yes it can be done. The glue WILL dull the blade quickly, as a few other suggested ,use one edge of jointer knife only. Now a days I have a special 4” jointer for this purpose….....plywood (glues), painted boards (paint is also hard on blades), edges of panels with formica, I do a lot with reclaimed lumber so this little jointer takes the beating leaving my bigger jointer for serious solid woods only..!

-- "My mission in life - make everyone smile !"

View MrRon's profile


3446 posts in 2282 days

#13 posted 02-02-2012 05:19 PM

Thanks for all the great tips. I don’t need to joint plywood often, just to take the fuzziness off the edge. DS251: Taking a relief cut off the heel is a good idea.

View Philzoel's profile


292 posts in 1382 days

#14 posted 02-02-2012 05:24 PM

OK to do by me. Have to be careful because of chip out. Blades were made to dull when you use them. I’m a philosopher.

-- Phil Zoeller louisville, KY

View Loren's profile


7967 posts in 2687 days

#15 posted 02-02-2012 07:23 PM

The way to do it is use only the 1” closest to the pulley on the
jointer. Jointing plywood often will “burn” that section of the
knives and may wear a hollow in the knives there. This way
the rest of the knife length can be used and sharpened as
normal while the burned section is used for the nasty business
of jointing ply.


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