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I started making a workbench top out of 1 sheet of mdf and one sheet of birch plywood. I edge trimmed it with 1 1/2 x 3/4 maple while attaching the maple my drill bit turned blue from the heat that I was generating. the bit jammed inside of the jig and even my 3/8 electric drill started to get hot enough to smoke a little, nothing beats the smell of an electric motor frying..where did I go wrong. I went and replaced the bit and still had trouble with the mdf. it  seemed like the mdf was jamming up the whole works. I had to dig the waste mdf out of the holes were the saw dust comes from. I was using the jig without the bench mount. I was clamping the jig to the work pc. at first I thought the clamp was covering the holes so I screwed the jig in and still had the same problem

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I find with MDF if i'm not using the dust port attachment I'll raise the drill up and down a fair bit to try and keep it clean. The problem is MDF contains a lot find dust and glue which heats up and melts (to put it simply) thus causing it to clog and burn.
I do most of my work with mdf, and I have found that dust extraction on the jig is a neccesity to prevent heat build up.
I haven't drilled a lot of pocket holes in MDF but given the nature of the material i'm not surprised you've had problems. either hook up a shop vacum to the jig or give the jig a blast of compressed air after drilling each hole. Working the drill bit slowly up and and down till your dept collar reaches the jig might help as well.
Thanks to everyone that replied, I figured it had to be the mdf that was causing the problem I never worked with mdf before and I'm not sure I'm a big fan of the mdf but the project turned out well and when I picked up the new bit I spent the extra couple of dollars and got the mini jig so I now have one of them also
Don't give up on MDF, you can do a lot with it! If it's a household product and i'm going to paint it, odds are I'll use as much as I can, just seal it properly and it will last forever!
A trick that's worked well for me is alternating between (2) corded 2,500 rpm drills, each with a sharp bit.
I'll drill one or two holes with my corded Ridgid brand drill and then place it on the workbench to cool...next, I pick up my corded Dewalt brand drill and drill another one or two holes.

This keeps the bits from overheating and becoming prematurely dull and allows me to be more productive. The orange Ridgid and yellow Dewalt colors
make it easy for me tell the drills apart.

I hope this helps.
I have built two benches with MDF and a router Table top with MDF using the K3 master system.

Using a cordless drill and attaching my shop vac to the dust port adapter, I have never had a problem. I make sure that I raise the drill and clear the hole several times drilling each hole. I think the problem is more the technique of drilling the holes.
your probably right, I was just drilling like I was using a pc of plywood or some other wood, sometimes I the way I think is don't force it just get a bigger hammer

Frank said:
I have built two benches with MDF and a router Table top with MDF using the K3 master system.

Using a cordless drill and attaching my shop vac to the dust port adapter, I have never had a problem. I make sure that I raise the drill and clear the hole several times drilling each hole. I think the problem is more the technique of drilling the holes.
Another option Kreg offers is the DKDB step drill bit. Since it's used mostly in their high production machines, it stays sharp longer. It sells for $34.99 on the Kreg website, and is made of cobalt steel. Yes, it's more expensive up front, but will probably last longer between sharpenings. If I ever get around to purchasing one , I'll do a quick review.

Please see below, from the Kreg website:

ITEM # DKDB


This heavy duty cobalt steel drill bit is uniquely designed for use with our high-production Pocket-Hole Machines. The bit itself features a one-piece design eliminating clogging and providing a much smoother and faster drilling stroke than drill bits with replaceable center drills. Idential 3/8” diameter also makes this a great premium drill bit upgrade for any of our Kreg Jigs.

Note: If you’re purchasing bit replacements for a DK 3100, be sure to also order a left hand drill bit (LH-DKDB) for the center spindle of this 3-spindle machine.

Product

Our Price: $34.99
thanks, if I get one I will also let everyone know if it was worth it

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