anyone know what kind of joint this is?

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Forum topic by bent posted 01-21-2010 03:46 PM 6357 views 6 times favorited 21 replies Add to Favorites Watch
View bent's profile


311 posts in 3903 days

01-21-2010 03:46 PM

this joint is on a drawer front on a small antique piece. i’ve never seen one quite like it before. at first i thought it was a just drilled out and a dowel was driven it. but it’s actually a round through tenon from the side of the drawer face. i can only imagine what a pain this must have been to make. any ideas what it’s called, or how it’s made?

21 replies so far

View GFYS's profile


711 posts in 3705 days

#1 posted 01-21-2010 03:59 PM

Antique router? I’d bet it was made with a rotary tool of some type.

View John's profile


173 posts in 4027 days

#2 posted 01-21-2010 03:59 PM

Don’t know what it would be called. I would cut the drawer sides first then mark the front. You could template rout the drawer front but your template would need to match the drawer side exactly. I’m not sure how I would cut the drawer side. A router bit could hog out most of the waste but it wouldn’t be able to get into the sharp points between circles. Chisel the rest? Are you going to use this joint? Let us know how it turns out.

-- Brain the size of a planet and they have me parking cars.

View Xtreme90's profile


193 posts in 3426 days

#3 posted 01-21-2010 04:09 PM

Bears ear joint??

-- "I don't cut wood. I machine it!" G.M. The wood machinest

View SteveMI's profile


1126 posts in 3528 days

#4 posted 01-21-2010 04:42 PM

I have a round tenon cutter that I use to make dowels. That would make the drawer front real easy with a simple indexing fixture. (Tenon cutter has 870 rpm max so you would need a tall drill press.)

Round mortises in drawer side could be done with forstner bit.

Cutting the rounded humps on the drawer sides could be done with a point cutting roundover router bit. (I have one from Whiteside for routing signs.) Another indexing fixture required.

Aligning the mortises and routed humps on drawer side would need a very accurate fixture.


View Gpops's profile


248 posts in 3678 days

#5 posted 01-21-2010 05:48 PM

Hi Bent,

I have a chest of drawers that utilizes the same joint. I have been asking for years how it was done. Let me know if you try and how it comes out.

View GaryK's profile


10262 posts in 4222 days

#6 posted 01-21-2010 06:10 PM

It’s called a pin and crescent joint. I have been waiting for the right project to come along to use it. The problem is that the drawer height has to be divisible by the number of pins and crescents.

-- Gary - Never pass up the opportunity to make a mistake look like you planned it that way - Tyler, TX

View CaseMan's profile


17 posts in 3359 days

#7 posted 01-21-2010 06:10 PM

That is a Knapp joint. There was a machine made just for those. It wasn’t in popular use for all that long so it may help in dating the piece.

-- - CaseMan -

View CaseMan's profile


17 posts in 3359 days

#8 posted 01-21-2010 06:13 PM

Here’s a router jig/template to reproduce the joints.

-- - CaseMan -

View Dave Owen's profile

Dave Owen

254 posts in 3308 days

#9 posted 01-21-2010 06:23 PM

My brother has a beautiful rosewood chest made with these joints. When I looked it up a couple of years ago, I found that it is a machine-made joint, and is known by a number of names: “Pin and Crescent”, “Crescent”, “Pin and Cove”, “Pin and Scallop”, “Half Moon”, “Knapp” – and likely others. The most common name seems to be the “Pin and Crescent” as noted by GaryK. I also discovered that “Woodworker’s Supply, Inc.” has a couple of jigs for making them.

-- Dave O.

View a1Jim's profile


117416 posts in 3811 days

#10 posted 01-21-2010 06:27 PM

Boy I learned a lot.

-- wood crafting & woodworking classes

View bent's profile


311 posts in 3903 days

#11 posted 01-21-2010 07:18 PM

yeah, me too!

thanks for all the information guys.

View Damian Penney's profile

Damian Penney

1141 posts in 4225 days

#12 posted 01-21-2010 11:34 PM

cool :)

-- I am always doing that which I can not do, in order that I may learn how to do it. - Pablo Picasso

View reggiek's profile


2240 posts in 3504 days

#13 posted 01-21-2010 11:37 PM

This was most illuminating…..As Jim said…I learned alot about a joint I had not seen very much…and I certainly never had a name for it before…Thanks all for the great lesson.

-- Woodworking.....My small slice of heaven!

View Jeison's profile


968 posts in 3342 days

#14 posted 01-22-2010 12:00 AM

look ma, i learned a new thing! oh wait, i think i just forgot how to blink in order to make room :(

-- - Jei, Rockford IL - When in doubt, spray it with WD-40 and wrap it with duct tape. The details will attend to themselves.

View araldite's profile


188 posts in 3638 days

#15 posted 01-22-2010 05:44 AM

Great thread. There’s always something new to learn.

-- Failure is the road to success if you learn to learn from your mistakes - Vince, Greenville, SC

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