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cutting mortises by hand, question

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Forum topic by Holbs posted 06-24-2013 03:40 AM 593 views 0 times favorited 4 replies Add to Favorites Watch
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Holbs

522 posts in 688 days


06-24-2013 03:40 AM

I did 12 mortises today. I feel more natural following Paul Seller's way of chopping mortises. His way or the standard way… I always seem to have trouble chopping the end walls at at perfect 90degrees. The first or second mallet whack is ok. But then my chisel always wants to jutt back towards the center 1/16th” or slightly more, leaving me with a 85degree end wall that I really have to work on to get back to 90.
Is this because:

A.) my material is stock 2×4 douglas fir? I am engineering a flip top table mounted on a wall bench so am using douglas fir as a rough draft.

B.) my chisel? I bought the 4pack Dewalt chisels to have a beginner initial affordable set. I have not yet sharpened them but they did chop 12 mortises rather well out of the box. Just this weekend, I did buy some old fashion Keen Cutter chisels and a new set of Crown Butt Chisels at an auction.

C.) my mortise chopping technique?


4 replies so far

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JADobson

307 posts in 770 days


#1 posted 06-24-2013 03:53 AM

I don’t think this is necessarily your problem, but sharpening your chisels will help. I bought some Narex chisels not long ago and I thought they were pretty sharp right out of the box. Then I sharpened them. The difference was unbelievable. I’d give that a try.

-- James

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Holbs

522 posts in 688 days


#2 posted 06-24-2013 03:57 AM

I didnt think i would get to doing a bunch of mortises JUST yet, to sharpen anything. If this flip top table pans out (ooo…the geometry involved!), my next priority will be flip top table for sharpening / grinding station, so I can put my Eze Lap diamond stones to use.

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Loren

7580 posts in 2306 days


#3 posted 06-24-2013 04:11 AM

Doug fir is tricky to mortise cleanly.

-- http://lawoodworking.com

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Arookar

79 posts in 1061 days


#4 posted 07-10-2013 04:03 AM

Sharpen and hone all new chisels. None are meant to be used out of the box. Don’t forget to flatten the back!

And especially if you are cutting softwoods like pine or doug fir. Both will tear out or slide along the grain as opposed to your cutting line unless you keep the chisel sharp sharp sharp! Seems counter-intuitive but in some ways they are harder to cut than maple.

-- The only gift is a portion of thyself. -Ralph Waldo Emerson, writer and philosopher (1803-1882)

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