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cutting MDF on the table saw

wendy1's picture

Hi,


I'm thinking of building a jig using  melamine coated MDF or just regular MDF 3/4" thick.  What I need to know before I go ahead and cut this on the table saw is whether or not this material will dull the sawblade? I have a 40 tooth carbide rip blade.


Wendy

Steve50's picture

(post #75079, reply #1 of 12)

Wendy - I wouldn't hesitate to use MDF for a jig but it is an aggressive material.  I questioned my sharpening guy about MDF and blades.  He indicated that carbide will dull more quickly with MDF than with a hardwood.  He also indicated that the factories that cut MDF do so with diamond blades something way beyond what I was willing to spend.


Steve

Dave45's picture

(post #75079, reply #2 of 12)

Cutting MDF will dull a carbide blade a little faster than hardwoods, but it won't be noticeable until you've run a lot of it thru the saw.  I have several carbide tooth blades ranging from 28 teeth to 60 teeth and they're on a "schedule" that gets each one to the sharpening shop about once a year.

nikkiwood's picture

(post #75079, reply #3 of 12)

Carbide tipped blades were originally designed to cut manufactured materials such as plywood, mdf, and the like. More teeth = smoother cuts.

Don't even think about using a diamond blade in your table saw. These are made for cutting stuff like tile and masonry products.

Maybe they use some kind of diamond tipped blades in industrial settings, but those things are not available to the likes of you and I.

********************************************************
"I tend to live in the past because most of my life is there."
-- Herb Caen (1916-1997)

******************************************************** "It is what we learn after we think we know it all, that counts." John Wooden 1910-
rem305's picture

(post #75079, reply #4 of 12)

Wendy

I have cut a fair amount of MDF. I wouldn't use a rip blade as it's too agressive. I use an Amana Melamine blade. I has a negative hook (teeth slant away from the cut) that make very smooth cuts. It's a little pricey and there may be other brands that also have this type of blade.

Make sure you have very good dust collection as mdf dust is really nasty. If you don't have strong dust collection, you'll have a cloud of MDF in your workshop. Amana also makes a similar blade that will fit in a hand circular saw. I have used both and they seem to not dull too quickly. Just clean them periodically to remove the resin used to bind the sawdust together to make MDF. I use CMT's blade cleaner and it works great.

I don't think I would consider diamond blades for this.

Hope this helps.

Rick

MatthewSchenker's picture

(post #75079, reply #5 of 12)

Wendy,
I agree with everyone here about the way that MDF affects the blade.

But I want to REALLY agree with Rick about dust collection. This is very important. MDF produces horrible dust. When I was new at woodworking, I didn't think too much about dust collection, and one day I cut a bunch of MDF. That night, my chest actually hurt from the stuff and I was coughing a lot. I decided I would never do that again, and while I was at it I decided to make sure and get better dust collection for plywood, and then for hardwood!

Here are some links I have collected on woodworking dust. All of these links are to non-commercial organizations concerned with health and safety. These should be enough to convince you!
http://www.worksafereps.org.nz/hazards/1054849600_10004.html
http://www.ccohs.ca/newsletters/hsreport/issues/2004/10/ezine.html#hazardalert
http://www.workershealth.com.au/pdfs/023wood.pdf
http://www.seqair.com/skunkworks/Tools/Respirators/Respirators.html
http://www.hazards.org/haz75/tucasthmasurvey.pdf
http://www.cpcb.nic.in/sept2001air2.htm
http://www.hc-sc.gc.ca/english/iyh/products/arts.html

I solved my problem by getting a Festool saw, which collects 95%+ of the dust.


Edited 7/14/2005 7:06 am ET by Matthew Schenker

awilson65's picture

(post #75079, reply #6 of 12)

MDF will dull blades eventually, but you will be able to cut a lot before you need to sharpen. Diamond blades are used in woodworking, but they are petty expensive, and they need a very controlled situation as they are vulnerable to shocks.....so cutting on a manual saw is pretty much a no-no.....computerised beam saw is more the answer.


For raw MDF and a 10" saw, I'd recommend an 80 tooth ATB blade....this will give  beautiful smooth cut. 80 tooth triple chip grind would be second choice.If coated with melamine, then an 80t melamine ATB with negative hook, or second choice again a triple chip grind.


Rip and combo blades don't have enough teeth for a smooth cut; chips are too big. 


cabinetmaker/college woodworking instructor. Cape Breton, N.S

cabinetmaker/college woodworking instructor. Cape Breton, N.S

ring's picture

(post #75079, reply #7 of 12)

Wendy,


I use an Amana 80 tooth blade for all sheet goods, including MDF.  Results are excellent, and there are a lot of other great blades out there at reasonable prices.  I send the blade for sharpening on a regular basis, after about 20 hours of cutting.  The cost of resharpening is really negligible if you factor it into the job.


DR

wendy1's picture

(post #75079, reply #8 of 12)

Hi,


Thanks for the info. I'll see if I have a dedicated cross cut blade downstairs in my workshop. I have a combination blade but not sure If I have a dedicated cross cut blade. If I do it definitely has less than 80 teeth. One of these days I should invest in a quality 80tooth blade.  60 teeth will have to do.


I won't be cutting too many boards of MDF so for now I'll just use the carbide blade if I decide to build the jig using MDF. (much cheaper than using hardwood or plywood.) Might just go in search of a piece of plywood to make this small tapering jig instead.


I take it I'm ok using a 40 tooth thin kerf rip blade for cutting plywood. I don't own a dedicated Plywood blade.


Wendy

PlaneWood's picture

(post #75079, reply #9 of 12)

MDF puts out a lot of bad dust when sawing.  Use a big fan to blow it away from you, or better yet, a large DC.  Don't breathe that crap!



PlaneWood by Mike_in_Katy (maker of fine sawdust!)
PlaneWood


PlaneWood by Mike_in_Katy (maker of fine sawdust!)
PlaneWood

mike4244's picture

(post #75079, reply #10 of 12)

Wendy, are you sure your blade is a rip blade? Most rip blades for a 10" saw are 30 teeth and less. Look at the teeth, if the tip is ground straight across, it's a rip blade. If the teeth are ground at an angle , this is looking straight down at the tips, then its a crosscut. In any event the blade will be fine if it's the only one you own.


If I have a lot to cut, I put a Freud 80 tooth blade in , made for crosscutting plywood. Otherwise I use the blade that is already on the arbor. I have made occasional cuts even with a rip blade, works fine. As another post mentioned, this material is dusty. Wear proper dust mask and try to collect as much as the dust as possible with your available equipment.Don't be concerned with the blade getting dull, yes it will dull more than wood,but it's not like cutting concrete either.I doubt you would notice any dulling of the blade for occasional cutting of mdf.


mike

wendy1's picture

(post #75079, reply #11 of 12)

Hi Mike,


Yup, My saw blade is a rip blade and it has 40 teeth.


Wendy


 

WillGeorge's picture

(post #75079, reply #12 of 12)

Old post but here goes..


Unless you cut ALOT of it the only broblem with cutting MDF on a TS is ..


1.. Pickin' that stuff up
2.. Breathing after cutting it


Actually it is GREAT if you do not mind the mess!


I think my routers make MORE dust than the TS..

Have a great day.. Life is wonderful even if you are having a bad day!