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Mortiser bit length

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Forum topic by CharlesA posted 09-06-2014 04:37 PM 719 views 0 times favorited 5 replies Add to Favorites Watch
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CharlesA

3021 posts in 1260 days


09-06-2014 04:37 PM

Topic tags/keywords: question mortiser

This has not been a good week for me and my motiser. I needed a 5/16” chisel/bit for the project I am working on. I did the first couple of mortises with my 1/4” bit, but since the mortises are 3 1/2” long, I was heating up the bit after having to basically cut each mortise twice to get the full width. I decided I should get a real 5/16” bit.

My first mistake was the CMT bit I ordered on Amazon—too much in a hurry and didn’t realize it was for a drill press.

So this morning I drove to Woodcraft first thing and picked up a 5/16” bit from them. It says it fits all the standard Asian mortisers. But the Woodcraft bit is only 2 12” long below the color compared to the 3 1/2” of all my other bits. It worked, but I had to hand chisel the bottoms out because I need space for 1” tenons on this plan. I have an x-y vise and I can only raise the work piece so high and still hold it securely.

Seems like for most chisel/bits on web sites, they only give the shank and set sizes, but not the length below the collar.

Now I’d like to find some 3 1/2” length bits. Any advice?

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson


5 replies so far

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CharlesA

3021 posts in 1260 days


#1 posted 09-06-2014 08:47 PM

Here’s a pic:

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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CharlesA

3021 posts in 1260 days


#2 posted 09-06-2014 09:30 PM

Looks like I have my own thread going here. Highland Woodworking does list the chisel dimensions on their of their Fish chisel/bits.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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TheDane

4997 posts in 3126 days


#3 posted 09-06-2014 09:41 PM

Charles—Can’t get to the shop now (I’m in the road) but I have had great luck with the premium chisels from Lee Valley. I have a Jet JBM-5, and am not sure what the maximum depth you can get with the LV chisels might be.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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CharlesA

3021 posts in 1260 days


#4 posted 09-06-2014 09:44 PM

Gerry,

Interesting that on their premium line, Lee Valley notes their bits have extra long shanks to work on a variety of mortisers.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

View timbertailor's profile

timbertailor

1592 posts in 887 days


#5 posted 09-06-2014 10:05 PM

All my chisels are from Jet. The 4 lengths of my chisels seem to match the numbers published above.

I built an x y vise and bench for my Mortiser, as well. Makes it so much nicer to operate.

I have had them a long time and I have never had to sharpen them. I know they are still sharp from all the blood they have drawn over the years. I really need to take the bits out when I am done!

-- Brad, Texas, https://www.youtube.com/user/tonkatoytruck/feed

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