Using MDF - Router Forums
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post #1 of 26 (permalink) Old 09-24-2015, 07:32 PM Thread Starter
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Default Using MDF

I intend to use a 1" flush trim bit on 3/4' MDF. Am I setting myself up for failure or disappointment with the results?
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post #2 of 26 (permalink) Old 09-24-2015, 07:36 PM
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Welcome to the forum . I'm are the resident experts will have an answer for you shortly .
All I know is wear a good quality mask when working with mdf
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I don’t always insulate , but when I do .
Ok ,I never insulate
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post #3 of 26 (permalink) Old 09-24-2015, 07:48 PM
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+1

The only thing I've found a use for MDF is as a spoilboard on the
CNC machine. That stuff is terrible to work with and has virtually no strength and crumbles and breaks and is heavy and ........

It was a major disappointment when I tried to work with it.

HJ

And I got 2 sheets of it in the basement
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post #4 of 26 (permalink) Old 09-24-2015, 07:56 PM Thread Starter
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Thanks for the input. I wanted to use stuff I had laying around my shop and save $ on new purchases. i figured if I was careful with pilot holes and glue, that the spare MDF I had might be a decent substitute for plywood. The project is a shop vac/dust cyclone cart which won't receive a lot of abuse. We'll see. Thanks again.
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post #5 of 26 (permalink) Old 09-24-2015, 08:40 PM
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Mdf has it's uses but in that one I think you would be better off with ply. One of the biggest problems you would have with that is the screws holding the wheels on. It also wouldn't take bumps that well.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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post #6 of 26 (permalink) Old 09-24-2015, 09:01 PM
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Welcome to the forum.
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post #7 of 26 (permalink) Old 09-24-2015, 09:32 PM
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Using mdf for most things is just an invitation to disaster. I like to save money as much as the next guy and some say more than most but Mdf is not the way. So save yourself some frustration and bite bullet and buy plywood.
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post #8 of 26 (permalink) Old 09-25-2015, 03:05 AM
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This mantle clock is 100% MDF. It cuts and routs very good but when it comes to finishing there is where I had problems. It soaks up finish like crazy, especially where you rout and cut with a saw. I used Zinsser Bulls Eye 1-2-3 to prime with. You might prime twice or three times before putting on a top coat. Try testing on some scrap. If I had known about how much you need to prime MDF my finishing would have gone a lot better. I am sure you know that they have been making routed cabinet doors from MDF for years.

Zinsser Bulls Eye 1-2-3 1 gal. White Water Based Interior/Exterior Primer and Sealer-2001 - The Home Depot

You can also get this primer in a rattle can and spray it.


Don in Murfreesboro,Tn.

Measure once cut twice and it's still to short.
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post #9 of 26 (permalink) Old 09-25-2015, 09:29 AM
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Quote:
Originally Posted by honesttjohn View Post
+1

The only thing I've found a use for MDF is as a spoilboard on the
CNC machine.
Have you tried this large sheets of flat (blue or pink) high density foam as a spoil board? They work GREAT, they save the tool, they do not add a load to the CNC machine, and they are really CHEAP when you want to do a test run in a wood-like material to make a prototype of whatever you are going to cut out of the more expensive material afterward.
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post #10 of 26 (permalink) Old 09-25-2015, 09:51 AM
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If your 1" cutter is the standard 1/2"D trimmer with an R-3 (3/16 x 1/2) bearing on it, you are looking for trouble. Whilst that cutter is capable of wasting a lot of MDF, it will chatter the work; it deflects. Use a bigger cutter, at least 3/4"D.
Most chip/dust collectors will clog, do this outside.
In my view, it will hold fasteners acceptably, work as lab surfaces and is useful for first run templets.
Uses MDF for all sorts of applications.
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