What is this joint called? Compound angle butt joint? - Woodworking Talk - Woodworkers Forum
Thread Tools Display Modes
post #1 of 7 Old 12-30-2014, 03:55 AM Thread Starter
Join Date: May 2014
Location: Austin, TX
Posts: 48
View mbira's Photo Album My Photos
What is this joint called? Compound angle butt joint?

Hi folks,
I'm attaching a pic to give an idea of what I build. The long ends are generally 65" and the long end piece is around 14" and the short end piece is around 6". The end pieces have an 8 degree angle on the edges making the bottom longer than the top. Because of the one end piece being wider than the other end piece, there is also a 3 degree angle on the edges of the long pieces where they butt against the end pieces. all pieces are 4/4.

I have always just done this as a butt joint and used two screws on each joint that are hidden with plugs.

I would like to get more elegant with these joints and move away from screws. I'm thinking about a mortise and tennon, but I have never seen anything on doing that with an angled joint. Can anyone point me to advice on how to approach that.

I'm also open to any other tips on good ways of doing this joint. Ideally, I would like to be able to do this quickly and efficiently, but the number one concern is making this joint strong and looking great-even if it takes longer. Thank for any advice!
Attached Thumbnails
Click image for larger version

Name:	10430907_10204676987700867_7190687378060844829_n.jpg
Views:	280
Size:	92.6 KB
ID:	113017  

Attached Images
mbira is offline  
Sponsored Links
post #2 of 7 Old 12-30-2014, 06:49 AM
Senior Member
Join Date: Jul 2008
Location: Florida Panhandle
Posts: 12,468
View GeorgeC's Photo Album My Photos
It would be difficult to do mortice and tenon because of the angles.

However, you could do hand cut box or dove tail joints. These would look nice.

Your last picture looks like you added dowels to the butt joint.

GeorgeC is online now  
post #3 of 7 Old 12-30-2014, 12:01 PM Thread Starter
Join Date: May 2014
Location: Austin, TX
Posts: 48
View mbira's Photo Album My Photos
Thank you for the reply. That last pic shows the plugs that I use to hide the screws. I suppose I could also do this with dowels instead of screws.

Regarding the difficulty of getting that angle on the shoulder of a M and T joint, it seems like it would be more cumbersome getting that same angle on each inside edge of the angled box or dovetail joint?

One thing I have noticed is that if there is a slight bow in the long pieces (these are 65" x 3" x 1"), then that three degree angle where the meet is slightly off and I need to finesse it a bit. The nice thing about the butt joint is that I can use a card scraper to get that angle down every so slightly to have a good fit.
mbira is offline  
Sponsored Links
post #4 of 7 Old 12-30-2014, 04:00 PM
Senior Member
Paarker's Avatar
Join Date: Mar 2013
Location: Schuylkill county pa
Posts: 834
View Paarker's Photo Album My Photos
If you're already cutting one angle for a butt joint why not lower the blade and cut two and there will be your tenon. don't forget to reverse the angle for the second side.

Fill your heart with compassion, seek the jewel in every soul, share a word of kindness, and remember; the people's what it's about.
Capt. Tony Tarracino
Paarker is offline  
post #5 of 7 Old 12-30-2014, 07:58 PM
where's my table saw?
woodnthings's Avatar
Join Date: Jan 2009
Location: SE, Michigan
Posts: 27,567
View woodnthings's Photo Album My Photos
angled mortise and tenon joints

This won't be cheap, but it will make the type of joints you need..... Or make them by hand?


even more expensive?

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 12-30-2014 at 08:05 PM.
woodnthings is online now  
post #6 of 7 Old 12-31-2014, 09:40 AM
Senior Member
Join Date: Aug 2009
Posts: 287
View Zircon's Photo Album My Photos
If you look at that frame, it is the same as a chair frame seat where the front of the chair is wider than the back and the long pieces are the sides of the chair. I have made several chairs M&T. I cut the tenons straight on the long(side ) pieces-easy-I do it with a band saw. The angled mortices I do with a router. I knock together a jig that looks like an old fashioned miter box except one side is higher than the other. then I clamp the workpiece into the miter box. The router rides on top of the miter box and it cuts the mortice. The correct angle for the mortice is achieved by calculating the difference in height between the two sides of the miter box which causes the router to ride at an angle.

Happy New Year!
Zircon is offline  
post #7 of 7 Old 12-31-2014, 09:54 AM
Senior Member
Join Date: Aug 2009
Posts: 287
View Zircon's Photo Album My Photos
Another thought- You might try a box joint. I just made a screw advance box joint jig that was described on WWT tips and tricks a while back. It's a really good design. Typically the back wall of a box joint jig stand straight up to make a 90 degree joint. You could make an angled back wall at the correct angle and cut the fingers a little long and trim them and end up with a box joint at an angle. I haven't tried this yet but I may play around with it to see if it works.
Zircon is offline  

Quick Reply

Register Now

In order to be able to post messages on the Woodworking Talk - Woodworkers Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
Plywood Butt Joint Nugs Joinery 6 04-01-2013 01:44 PM
Miter or butt joint for post? Masterjer General Woodworking Discussion 14 02-12-2013 11:32 AM
How to make this joint (i think its called a knapp joint) Upstate Joinery 6 12-23-2011 11:30 AM
Butt Joint vs Reverse glue joint nblumert Joinery 3 07-30-2009 09:32 AM
Simple butt joint problem ? Daren Joinery 19 08-18-2007 08:42 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

For the best viewing experience please update your browser to Google Chrome