Planing MDF?

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Forum topic by juniorjock posted 05-27-2009 04:44 PM 5565 views 0 times favorited 10 replies Add to Favorites Watch
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1930 posts in 4006 days

05-27-2009 04:44 PM

Topic tags/keywords: planing mdf with dw 735

I’m sure this has been asked and answered before but I searched the site and couldn’t find the it. I have some 3/4” MDF that is slightly thicker than what I need it for. My question is: Is it ok to run the MDF through my DW 735? I’m thinking that the glue in the MDF may be a little too hard on the blades. Thanks in advance.

10 replies so far

View hootr's profile


183 posts in 3587 days

#1 posted 05-27-2009 04:49 PM

i haven’t tried it either but i think if you slow the feed rate way down and take baby bites it would work

-- Ron, Missouri

View CharlieM1958's profile


16281 posts in 4459 days

#2 posted 05-27-2009 04:58 PM

I don’t work with it much myself, but I hear that it is really tough on saw blades, so I would think it would be hard on planer blades as well.

-- Charlie M. "Woodworking - patience = firewood"

View GaryK's profile


10262 posts in 4229 days

#3 posted 05-27-2009 05:03 PM

Say goodbye to your sharp blades if you do it.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

View turkva's profile


29 posts in 4186 days

#4 posted 05-27-2009 05:35 PM

I have done it twice now, I had to reduce the thickness of a couple of door panels by about 1/16”. I have a Delta 13” planer and set it for 1/32” cuts at the slower feed rate. Worked fine. I did put in a set of used knives as I thinking it would dull my new knives. The panels came out nice and smooth, but not as smooth as the original surface. And it will suck up the paint also since you are opening up the “grain” of the wood. It didn’t seem to hurt the knives too much, but I would suggest using older knives if you have them.

Hope this helps.

-- Accept Nothing, Challenge Everything

View RedShirt013's profile


219 posts in 3903 days

#5 posted 05-27-2009 06:02 PM

The adhesive will dull any HSS steel blades quickly. Plus some MDF is not consistent in density surface vs core, so if you’re not laying up the veneer/plam shortly after and it’s not balanced and MC changes it might not be flat anymore.

-- Ed

View Damian Penney's profile

Damian Penney

1141 posts in 4232 days

#6 posted 05-27-2009 07:08 PM

I’ve done it and it works fine, I get so little shop time that blade dulling isn’t much of a problem :)

-- I am always doing that which I can not do, in order that I may learn how to do it. - Pablo Picasso

View jeffss's profile


3 posts in 3527 days

#7 posted 05-28-2009 12:40 AM

mdf is an extruded product and as such can have any-thing in it. i work at Marc Adams School of woodworking, and a student brought in a sheet of OSB ( ie wafer board) with a wire bristle brush (1/2 sanded away) embedded in it. from the other side it looked perfectly normal. other instructors have found stones or BOLTS in their MDF. I would run it through a drum sander before planing it, personally.

View BarryW's profile


1015 posts in 4147 days

#8 posted 05-28-2009 12:52 AM

nope…not in my book

-- /\/\/\ BarryW /\/\/\ Stay so busy you don't have time to die.

View kimball's profile


323 posts in 3538 days

#9 posted 05-28-2009 03:58 PM

I’ll tell you this, MDF is extreemly hard on the carbide on saw blades….. so…. to extrapolate that to the blades on a thickness which are made of HSS and have at least 96 times more cutting surface…....

View doyoulikegumwood's profile


384 posts in 4233 days

#10 posted 05-28-2009 04:24 PM

i’ve planed this stuff befor the only thing i would say is add an inch all the way around each peice your sending thru the planer ive found i get some chip out on the edges.

-- I buy tools so i can make more money,so ican buy more tools so I can work more, to make more money, so I can buy more tool, so I can work more

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