Cutting mortises

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Cutting mortises

Postby Phil » Tue Jun 19, 2018 6:48 pm

I am making a table that will have mortise and tennon joints connecting the rails to the legs. I drew a rectangle 1" x 4" and used the fillet tool so I won't have to cut a tennon with rounded corners. This leaves an amount of material that I would have to remove. I drew a small rectangle in the area I need to remove, (the small green box at the right end of the top rectangle). Next I used the weld tool to create a more suitable end. The lower drawing shows the tennon in red and how it will fit into the mortise on the right end as compared to the left end. I will have a very small corner to remove with a file or coarse sandpaper.

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Re: Cutting mortises

Postby Adrian » Tue Jun 19, 2018 7:40 pm

Did you try the T-bone fillet option?
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Re: Cutting mortises

Postby adze_cnc » Tue Jun 19, 2018 7:43 pm

How about just cutting the rectangle and cleaning up the mortise corners with a good sharp chisel?
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Re: Cutting mortises

Postby highpockets » Tue Jun 19, 2018 9:42 pm

Or radius the tenons.
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Re: Cutting mortises

Postby Phil » Wed Jun 20, 2018 1:31 pm

I considered all of these options;
Thanks for your input gentlemen. My option is very similar to the T-bone, I don't know how much difference it make but the T-bone removes more material. Chiseling, I have 8 mortises each with 4 corners. I would have to chisel 32 corners - no thanks. Radius the tenons - how do you radius a tenon with a CNC?

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Re: Cutting mortises

Postby 4DThinker » Wed Jun 20, 2018 1:35 pm

If you can clamp your stretcher vertical you can make your tenons with rounded corner on the CNC. I do this all the time when dogbone or t-bone fillets on the mortise corners aren't acceptable.

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Re: Cutting mortises

Postby Phil » Wed Jun 20, 2018 3:15 pm

4DThinker wrote:If you can clamp your stretcher vertical you can make your tenons with rounded corner on the CNC. I do this all the time when dogbone or t-bone fillets on the mortise corners aren't acceptable.

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Thanks but this is not an option - the rails are almost 7' long.

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Re: Cutting mortises

Postby 4DThinker » Wed Jun 20, 2018 3:39 pm

Using the 2-sided project setup, a moulding tool path and a couple of pockets you can get very close to a complete rounded edge tenon. The attached sample used a 1/4" ball nose bit but you could use a smaller bit and have less work to clean out the corners.
2-faced tenon.jpg
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2-faced tenon 4D.crv
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Re: Cutting mortises

Postby Phil » Thu Jun 21, 2018 1:22 pm

Thanks 4D, I considered rounding the ends like that on my router table. I went with my "modified T-Bone" as a way to minimize hand work. I'm pleased with the results. I was able to knock down the corners of the tenons in seconds with 80 grit sandpaper.

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