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Jointing plywood

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Forum topic by MrRon posted 02-02-2012 12:28 AM 2036 views 0 times favorited 15 replies Add to Favorites Watch
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MrRon

2970 posts in 1987 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

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Elizabeth

811 posts in 1887 days


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

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

http://woodgears.ca/jointer/plywood.html

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crank49

3506 posts in 1715 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 :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

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cabmaker

1311 posts in 1553 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

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jjempson

193 posts in 1732 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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MrRon

2970 posts in 1987 days


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

Thanks for the replies and answering my question.

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Rick Dennington

3592 posts in 1938 days


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

MrRon:

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 started with nothing, and I've still got most of it left".......

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DS

2132 posts in 1164 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

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NBeener

4806 posts in 1918 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

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dannelson

151 posts in 1115 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

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doncutlip

2832 posts in 2300 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

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Dusty56

11684 posts in 2432 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!

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canadianchips

1836 posts in 1741 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 !"

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MrRon

2970 posts in 1987 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.

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Philzoel

277 posts in 1087 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

Loren

7821 posts in 2391 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.

-- http://lawoodworking.com

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