mortise jig

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Forum topic by SqPeg posted 12-16-2012 07:11 PM 1328 views 0 times favorited 6 replies Add to Favorites Watch
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15 posts in 2015 days

12-16-2012 07:11 PM

Topic tags/keywords: jig

I am making a large picture frame, 25×36x5” wide members and mitered corners. Does anyone have a jig that will hold the pieces so the mortises can be cut with a benchtop mortising machine?

6 replies so far

View Loren's profile


10476 posts in 3674 days

#1 posted 12-16-2012 07:27 PM

Leave the mortised boards overlong and mortise them
as normal, then cut them off at the miter angles.

View runswithscissors's profile


2767 posts in 2051 days

#2 posted 12-17-2012 01:22 AM

Loren’s suggestion is good, but I think your mortiser may be able to cut those even with the miters already cut. Just be sure the molding is securely clamped. I assume you are planning on a spline tenon to go in the mortises?

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View SqPeg's profile


15 posts in 2015 days

#3 posted 12-17-2012 02:21 PM

yes it will be a blind spline 1/4×2”. The frame sides are 25” long so. I have to hold them at a 45 degree angle under the head of the mortiser so the bit will go in perpendicular to the face of the miter. Not sure how or if it can be done and still move the stock so that the bit will cut the entire lenght of the spline.

I get the feeling a bench mortiser is limited to doing only do miters in butt joined parts

View casual1carpenter's profile


354 posts in 2501 days

#4 posted 12-17-2012 04:04 PM

SqPeg, my take on the postings above, I think this shows it somewhat…...
Is this what you had in mind? Perhaps not, but it could be a solution.

View pintodeluxe's profile


5705 posts in 2839 days

#5 posted 12-17-2012 06:38 PM

I havn’t had to use any special jig for projects that size using my benchtop mortiser. If the workpiece is too wide to fit under the hold down, I install a riser block to raise the machine up enough to allow clearance.
Just curious, what problem would a jig solve for you?

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View SqPeg's profile


15 posts in 2015 days

#6 posted 12-18-2012 01:47 AM

I spent some time in the shop today and find that both suggestions will work. I have been over-thinking the situation. A jig is not necessary. In my case it is the old adage, ‘shoot the engineer and build the project’.

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