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Old 9th June 2013, 12:55 PM   #1
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Default Saw blade for kerfing MDF?

I've seen mention of a thinner blade for use when kerfing wood...

What specifically should I be looking for when doing MDF? How many teeth per inch?

Any help would be great! thanks!
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Old 9th June 2013, 01:53 PM   #2
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You are using a table saw? You can cheap out a bit for an application like this by using a circular saw blade in your table saw. More teeth is generally a good thing when you want a smooth finish on the cut. A good/square fence setup is a must for safety!
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Old 9th June 2013, 10:21 PM   #3
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I'll be using a Milwaukee 18volt cordless saw, takes a 6.5inch blade.

Not too concerned with what it costs, if its a good blade.

Am I to assume most hand held circular saws have a similar width blade anyway?
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Old 9th June 2013, 10:37 PM   #4
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Quote:
Originally Posted by ThyDntWntMusic View Post
Am I to assume most hand held circular saws have a similar width blade anyway?
Depends on what you think is similar.
Kerf widths from .104 to .125 are common.
With a battery powered saw, look for a thin kerf and a couple spare batteries .
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Old 9th June 2013, 10:55 PM   #5
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ThyDntWntMusic,
A wider blade with take more power from you portable saw to cut and you will use your battery faster. One thing I will say about the subject of blade width is that the width of the groove will have much to do with how much you can bend the wood as much as how close together you place the grooves. I don't think you should worry to much about the finish of the cut as you will be closing the cut up with the bending and it will be on the inside of the cabinet. You can look at the set of the teeth on the blade and that will also have much to do with the cut width, as much or more than just the thickness of the blade body. Some blades will have a straight set tooth profile and some can have a wide offset to the individual teeth. It also depends on the thickness of the MDF that you will be using in your project which blade you would want to use.
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Old 9th June 2013, 10:59 PM   #6
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I'm wanting to do more cuts, closer together, to get a smoother bend, hence looking for the thinnest blade possible

Saw has never struggled with anything I've thrown at it, upto 36mm MDF (double layer 18mm)

Battery life isn't of concern either.

Might head to my local hardware store and see what they have available, and go from there.

Thanks!
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Old 10th June 2013, 02:45 AM   #7
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I'm using the blade I already had.

Meant to give a 1.6mm wide cut...

as its a cordless saw, it uses a 165mm/6.5inch blade.... The local bunnings stock nothing in that size except two Dewalt blades.... :/
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Old 10th June 2013, 04:53 AM   #8
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Ok, here's where I'm at.

Trying to kerf a 100mm radius (200mm diameter)

Circumference of a 200mm circle is 628mm, so, for a 90 degree bend, the outside of the bend needs to be 157mm.

My first and last cuts are 160mm apart, and I chose to do 16 cuts because it seemed like a nice neat number.... was this a mistake?

I don't seem able to get a 90 degree bend, and the MDF is starting to sound like it will crack.....

thanks!

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Old 10th June 2013, 04:58 AM   #9
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Kerfing MDF? Maybe I am missing something but that is something I would not consider.

Did it work for anyone? What radius?!
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Old 10th June 2013, 04:58 AM   #10
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18mm MDF, means an 82mm internal radius.

Which is a 515mm circumference, so 129mm for a 90 degree bend.

160mm external - 130mm internal = 30mm of material needs to be removed?

1.6mm blade, so... 19 cuts....

damn....
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