How to use a router to cut biscuit slots?

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Forum topic by b2rtch posted 03-04-2011 03:51 AM 4870 views 0 times favorited 4 replies Add to Favorites Watch
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4868 posts in 3252 days

03-04-2011 03:51 AM

How to use a router to cut biscuit slots?
How thick are the biscuits?
How deep to cut the slot?
How to be right on center?
What is the relation between the thickness of the material we assemble and the size of the biscuits?
Thank you.

-- Bert

4 replies so far

View Loren's profile


10477 posts in 3852 days

#1 posted 03-04-2011 04:25 AM

If memory serves you use a 5/32” slot cutter and move the router
from side to side a bit. You don’t have to be right on center with
biscuits, especially when cutting the slots with a router because router-cut
biscuit slots are a bit more forgiving in terms of biscuit placement.

I don’t really recommend this method though – mostly because
plate joiners have come down a lot in price and a decent 5/32”
slot cutter is about $30, not useful very often and because the
router can only work very close to the edge of a panel while
the joiner can make a cut anywhere.

Of course if you’ve already got the slot cutter…

View PurpLev's profile


8547 posts in 3852 days

#2 posted 03-04-2011 04:30 AM

you can use it on a router table with stops. it doesn’t matter if the biscuit is centered as long as all the parts are cut with the same side against the fence/table so that the offset is aligned between the parts. thickness by my guess should be same as tenons – 1/3 thickness of the part for most or if you are actually using biscuits – match their thickness.

depth should be half the biscuit width, and you can leave a bit extra depth for glue excess to make sure you won’t have to deal with pressure – I’d leave 1/16-1/8” extra thickness the most.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View b2rtch's profile


4868 posts in 3252 days

#3 posted 03-04-2011 04:37 AM

I already have the slot cutter.
Thank you all.

-- Bert

View bobsmyuncle's profile


110 posts in 2895 days

#4 posted 03-04-2011 06:03 AM

My brother in law had a kit that was supposed to turn a router into a biscuit cutter. It was a joke. Slow, cumbersome, and not very accurate. In addition you could only do the edge of boards not a T-joint in the middle of a board.

I’d suggest asking around for someone that has upgraded to a Domino, never used it, or never found it useful and has a perfectly good biscuit machine sitting on a shelf gathering dust.

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