My Shop Fox Mortiser Always Burns Lumber! Help!

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Forum topic by Aric posted 09-13-2017 04:51 PM 1025 views 0 times favorited 3 replies Add to Favorites Watch
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11 posts in 1800 days

09-13-2017 04:51 PM

Topic tags/keywords: shopfox shop fox mortiser mortising burn burning drill drill press chisel

I have a shopfox benchtop mortiser that ALWAYS burns the stock I am trying to mortise. I tried readjusting the chisels, I tried going at incredibly slow feed rates, and there is always a lot of smoke coming form the stock and a lot of burning. I thought maybe it was the chisel part of the bit, so I took it out to use just the drill bit and it still causes just as much burning. Chisels are BRAND NEW and Shop Fox brand. I tried mortising on walnut and cedar and both had the same results. If you guys have any ideas or tips that would be great!

Thank you!

3 replies so far

View papadan's profile


3584 posts in 4825 days

#1 posted 09-13-2017 04:55 PM

Can you post a picture of the machine?

View Matt Rogers's profile

Matt Rogers

113 posts in 3427 days

#2 posted 09-14-2017 10:39 PM

It is dull. One way or another, the chisel is dull, the drill bit is dull, or they are sharp, but the angles are wrong. If you have not sharpened and polished the chisel and bit, then check that first. Even new out of the box, you still should sharpen and polish.

-- Matt Rogers, and

View AZWoody's profile


1478 posts in 2680 days

#3 posted 09-14-2017 10:52 PM

Is the drill bit rubbing the inside of the chisel? That can create a LOT of heat from the friction also.
You do have to sharpen though as Matt mentioned.

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