Lunchbox planer and plywood

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Forum topic by MrRon posted 01-13-2019 04:30 PM 619 views 0 times favorited 10 replies Add to Favorites Watch
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5715 posts in 3750 days

01-13-2019 04:30 PM

Topic tags/keywords: question

I had two pieces of 1/2” plywood, approximately 6”x 9” that needed to be 0.359” thick. The only way I could accomplish that was to run them through my planer. I was apprehensive about it due to the adhesive in the plywood may damage the knives. The first piece went through without any issue. I still have to run the second piece through. Do you think doing this will damage the knives? It is not something I will be doing again in the future.

10 replies so far

View Rich's profile


4965 posts in 1096 days

#1 posted 01-13-2019 05:04 PM

The times I’ve edge jointed baltic birch, I wound up with nicks in my blades that had to be ground out. Pretty deep ones at that. I’d imagine the flat nature of running it through the planer would minimize any of that type of damage to the blade, but it most likely dulled them a bit.

-- Dopeler Effect: The tendency of stupid ideas to sound smarter the faster they come at you.

View Orvile Baker's profile

Orvile Baker

237 posts in 1184 days

#2 posted 01-13-2019 05:56 PM

Tried it one time and had to replace my blades.

-- Bud Baker , Ojibwa, WI.

View clin's profile


1067 posts in 1502 days

#3 posted 01-13-2019 06:49 PM

I wouldn’t do it. Plywood is tough on saw blades let alone planer blades. I’m curious, for something so small, why not just use a board that you can plane to desired thickness?

-- Clin

View AlaskaGuy's profile


5350 posts in 2815 days

#4 posted 01-13-2019 09:04 PM

Do the math for me. How much do you have to take off to get what you want?

I’m thinking drum or wider belt sander. I wouldn’t do the planer myself.

-- Alaskan's for Global warming!

View Jeff's profile


508 posts in 3701 days

#5 posted 01-13-2019 09:13 PM

I have a DW735. Pieces that short should never be fed into it. Manual says it and I’ve experienced it. Never again.

View LesB's profile


2201 posts in 3949 days

#6 posted 01-13-2019 10:31 PM

I agree with the pieces being too short for safety. And plywood is hazardous to plane. Often the inner layers are softer wood than the top veneer but the glue is not.
Does it have to be plywood or could you substitute all wood board, oak, beech, pine, etc. You could plane a longer piece the width you want and then cut to length. Both problems solves.

-- Les B, Oregon

View EarlS's profile


3087 posts in 2854 days

#7 posted 01-13-2019 11:00 PM

OK – so I’m going to go against what they all said. I’ve run short pieces through by slightly overlapping them. I’ve also run plywood through my 735 planer with no ill effects to the blades.

Having said that, I’ve also had a short piece catch and break the gear that runs the infeed roller. I’d run the plywood through the planer then cut it to size if you must. The better approach, like everyone else suggested is to use real wood or sand it down with a belt sander.

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View AlaskaGuy's profile


5350 posts in 2815 days

#8 posted 01-14-2019 01:09 AM

The lenght of stock you run through your planer, sander should be long enough so there is at least one pressure roller is in contact with the stock at all times. If you don’t you risk that piece raising up into the blade possibly causing real damage to you machine.

-- Alaskan's for Global warming!

View MrRon's profile


5715 posts in 3750 days

#9 posted 01-14-2019 06:41 PM

Too much material to remove with a sander. The plywood is maple veneer, 1/2” thick. The first piece went through without any issue. I’m using plywood because I only need a small piece and I don’t want to have to buy a 1×8 board for such a small piece (6×9). I guess I will just take a chance and finish that last piece of plywood. If it works; fine; if not, then a lesson learned.

View MrRon's profile


5715 posts in 3750 days

#10 posted 01-22-2019 03:04 AM

I ran the second piece of 6×9 plywood through the planer and everything is ok. The knives seem to have survived, but it’s not something I would want to do often or even again. Quit while ahead. BTW, the plywood was birch, 7 ply.

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