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Forum topic by ardbeg posted 09-17-2015 08:58 PM 565 views 0 times favorited 5 replies Add to Favorites Watch
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102 posts in 2447 days

09-17-2015 08:58 PM

Topic tags/keywords: jig tablesaw clamp blade router

I need to put slots (through mortises) in basswood rails which are anywhere from 18” to 108” long, 3/4 thick, and 1 1/2 to 5 1/2 wide. Slots are 1/4”x 3”. 2 to 4 per rail. The slots are located by the ends and occasionally in the center if the rail is long. They need to be repeatable and done 20+ an hour. This is in a production environment. I was hoping a woodrat might work, but doesn’t seem like it will.

In essence, I need to cut a bunch of through mortises quickly and somewhat precisely in a way that is repeatable and straightforward.

Any thoughts?

-- You may delay, but time will not. --Ben Franklin

5 replies so far

View Dallas's profile


3599 posts in 1907 days

#1 posted 09-17-2015 09:01 PM


-- Improvise.... Adapt...... Overcome!

View bondogaposis's profile


3969 posts in 1771 days

#2 posted 09-17-2015 09:09 PM

Sounds like you need a chain mortiser. Here's one.

-- Bondo Gaposis

View jerryminer's profile


497 posts in 861 days

#3 posted 09-18-2015 05:15 AM

Slot mortiser. Multi-Router. Wirth Machine

View JAAune's profile


1614 posts in 1736 days

#4 posted 09-18-2015 06:31 AM

A custom-built CNC horizontal router would do the trick. One two axis movement required so it’s not a difficult build.

Slot mortisers as others have mentioned are also well-suited for this type of work.

-- See my work at and

View Rick M.'s profile

Rick M.

7697 posts in 1800 days

#5 posted 09-18-2015 07:12 AM

Can you get router bits or mortising chisels that will cut 5.5” deep mortises? And why would you need CNC, that seems like an unnecessary complication.


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