Joints Anyone

Show off your handy work here
4DThinker
Posts: 254
Joined: Wed Oct 07, 2015 10:57 am
Contact:

Creative CNC Joinery

Postby 4DThinker » Fri Nov 27, 2015 11:04 am

I've come across that same link several times, and I appreciate what the author has done. One of my goals is to use the CNC to improve the strength, simplicity of cutting, and variety of application for what look like more conventionally cut joints.

If I was going to make the pins on that 2x5 pin rabbet joint go through I'd change to profile shape of the pins to make them more interesting. Even if done using the same wood for both parts the end grain of the pins would be in contrast to the face grain of the board they show through.

4D
Last edited by 4DThinker on Tue Mar 29, 2016 2:23 pm, edited 1 time in total.

4DThinker
Posts: 254
Joined: Wed Oct 07, 2015 10:57 am
Contact:

Creative CNC Joinery

Postby 4DThinker » Fri Jan 08, 2016 6:31 am

I had to put some trim around a table top I'm making, and had some 3/4 BB ply scraps wide enough to use. I wanted to make a corner joint that would pretty well lock together and take advantage of the plywood qualities rather than work against them. Did a finger joint test first. I got a clean front face but the plywood split out on the back face as the bit came through.

Thought a mitered corner would look nice, but wanted more interaction between the side and face. Wanted it to line up on its own, and not weaken either half in any way that might affect strength or looks. This is what I came up with. I'm calling it a Pinned Mitered Rabbet.

Trim Corner Test Inside1.jpg
Fingers Test Inside
Trim Corner Test Inside1.jpg (1.37 MiB) Viewed 5887 times
Last edited by 4DThinker on Tue Mar 29, 2016 2:23 pm, edited 2 times in total.

4DThinker
Posts: 254
Joined: Wed Oct 07, 2015 10:57 am
Contact:

Creative CNC Joinery

Postby 4DThinker » Fri Jan 08, 2016 6:32 am

Bad side of fingers.

Trim Corner Test Outside2.jpg
Finger test outside
Trim Corner Test Outside2.jpg (1.4 MiB) Viewed 5887 times
Last edited by 4DThinker on Tue Mar 29, 2016 2:23 pm, edited 2 times in total.

4DThinker
Posts: 254
Joined: Wed Oct 07, 2015 10:57 am
Contact:

Creative CNC Joinery

Postby 4DThinker » Fri Jan 08, 2016 6:34 am

Mitered rabbet.

Trim Cormer Pinned Mitered Rabbet1.jpg
Mitered Rabbet top view
Trim Cormer Pinned Mitered Rabbet1.jpg (1.42 MiB) Viewed 5889 times
Last edited by 4DThinker on Tue Mar 29, 2016 2:23 pm, edited 2 times in total.

4DThinker
Posts: 254
Joined: Wed Oct 07, 2015 10:57 am
Contact:

Creative CNC Joinery

Postby 4DThinker » Fri Jan 08, 2016 6:35 am

Pinned face.

Trim Cormer Pinned Mitered Rabbet2.jpg
Through Pins. Could also have been blind.
Trim Cormer Pinned Mitered Rabbet2.jpg (1.37 MiB) Viewed 5889 times
Last edited by 4DThinker on Tue Mar 29, 2016 2:23 pm, edited 2 times in total.

4DThinker
Posts: 254
Joined: Wed Oct 07, 2015 10:57 am
Contact:

Creative CNC Joinery

Postby 4DThinker » Fri Jan 08, 2016 6:40 am

Another View. I used the fluting toolpath on a parallel array of short lines to cut the mitered part of this joint on both halves. The plywood has 13 even layers, so I inset the pins exactly one layer from the inside edge. Left them cleanly cut. I now have my table top framed with this joint on each corner.

Trim Cormer Pinned Mitered Rabbet4.jpg
Corner View
Trim Cormer Pinned Mitered Rabbet4.jpg (1.49 MiB) Viewed 5889 times


4D
Last edited by 4DThinker on Tue Mar 29, 2016 2:23 pm, edited 2 times in total.

User avatar
HANNAH024
Posts: 289
Joined: Fri Aug 21, 2015 9:57 am

Re: Joints Anyone

Postby HANNAH024 » Fri Jan 08, 2016 9:25 am

Nice Joint. Perfect fit and It looks really strong too
It is what it is!
Have a great day.
HANNAH

Hmr
Posts: 8
Joined: Sun Nov 22, 2015 9:38 pm

Re: Joints Anyone

Postby Hmr » Fri Jan 08, 2016 9:47 am

Excellent work! Thank you for the pics and tips you share here and elsewhere.

4DThinker
Posts: 254
Joined: Wed Oct 07, 2015 10:57 am
Contact:

Creative CNC Joinery

Postby 4DThinker » Fri Jan 08, 2016 12:03 pm

HANNAH024 wrote:Nice Joint. Perfect fit and It looks really strong too
Thanks Hannah. Perfect fit is easy to do using the CNC, although this joint took a few strokes of a file on the inside faces before it would go together. The pins used the same vectors as the holes, but I used a -.005 pocket allowance on the holes so they didn't need a press to put together. You can make a joint so tight there won't be any room for glue. My students often wonder if they HAVE to use glue given how tight a CNCed joint may seem. Invariably their wood will shrink/expand a few times and that glueless joint will slip apart. So YES, they learn how to build in some tolerance so they don't have to fight assembly and can use glue.

4D
Last edited by 4DThinker on Tue Mar 29, 2016 2:24 pm, edited 2 times in total.

4DThinker
Posts: 254
Joined: Wed Oct 07, 2015 10:57 am
Contact:

Creative CNC Joinery

Postby 4DThinker » Fri Jan 08, 2016 12:05 pm

Hmr wrote:Excellent work! Thank you for the pics and tips you share here and elsewhere.
You are quite welcome. I didn't get my experience instantly, so I'll pass your thanks back to all those who shared their knowledge to inspire me. This is me paying it forward,

4D
Last edited by 4DThinker on Tue Mar 29, 2016 2:24 pm, edited 2 times in total.


Return to “Projects”

Who is online

Users browsing this forum: No registered users and 2 guests