How to Make a Tusk Tenon Joint Like a Pro

[Music] welcome to skill builder I'm Robin clever thanks to all those new subscribers that we've got and if you're not a subscriber now's a great time to do that because I'm bringing you another structural woodworking joint this is following the success of the scarf joint video if you haven't seen that maybe watch it after this video I'm gonna make a tusk tenon the tusk tenon is a very traditional joint it goes back hundreds and hundreds of years and where do you find it you find it in structural flaws and you trim around chimney breasts anywhere that you need to cross or create an opening in a structural floor sometimes even in a roof so what am I going to do I'm going to draw a little template for you and then I'm gonna take you through the whole process is one of my favorite joints so keep watching so I'm going to sketch the joint out on this piece of board here so this is the timber I'll be using so this is about the section you'd use in a floor it's a little bit bigger than a joist and what we're going to do with this is I'm going to first draw a line straight through the corners like this now the reason I do that is if you can see this section and this section this sections in tension and this sections in compression and that's when the joist is in the upright all of this bit here is just holding it together basically and this and this is interesting but if you can imagine the shape of an RSJ it's like the timber without all of the actual timber so what this joint does is on the neutral axis which is straight down the middle we poke a tenon now that tenon is one-sixth of the overall high of the timber then we put the tusk now this is the tusk it's a stopped housing there and that's also within the neutral axis in fact it's exactly a quarter of the trimming that you're doing so here's the joist here so I'll just get you out it looks something like this and there this is the tenon that is the tusk and the I've always pondered this but I wonder if you think of an elephant the trunk and obviously the Tusk is underneath and this shoulder is running back and if I just draw in the joist now where it's going to marry and then the neutral axis you get the picture now that's where we're at so it's a really strong joint you don't weaken the timber that it's going into and then we finally put a hardwood wedge here which we drive down and it pulls the joint up and it holds it there for good [Music] so when I'm out on-site and I'm doing this joint I will be doing more than one I probably be doing about four or eight depending on the structural opening that I'm doing so what do you do nowadays obviously you use a metal proprietary hanger such as this with the solid twist nails so when you're doing a listed building or restoration work or something you gonna see this is my joint so as I'm doing a lot on site I'll make myself a template in this case it's a bit of 9 millimeter MDF it's absolutely perfect so I'll mark it up on here once transfer it to the stock that I'm actually going to use and I can repeat that process and I'll keep this now in the garage mark it up and that'll be for future use as well two three four five six so I've made my template here and all these proportions are actually really quite important starting with the tenon that's straight down the central axis or the centre of the timber and that is one sixth of the overall height of the timber secondly the Tusk is one quarter of the overall thickness of the timber and then the shoulder for this beveled housing is exactly on the line of the Tusk what this actually does is stop the timber from rotating if you didn't have that there and you had the tenon running right back to that square shoulder then the chances are the timber could cup and move well that does is lock it in and keep it nice and square and true when it's all cramped together so I'm going to mark it over here like this transfer my marks around cut this out I've also marked with the tenon off the face edge and so we'll cut the tenon we'll cut the mortise and then we'll do the housings for the shoulders I'm just going to tidy all this up with my roofing square is pretty good [Music] [Music] [Music] so that's the first part of the joint done here you can see the tenon here you can see the tusk there's the beveled shoulder now I'm going to go and do the mortise and also the housings for this joint [Music] okay so while Robin sharpening his chisel I just want to tell you that today's sponsor who is Skillshare now they've got thousands of online video training courses covering hundreds of subjects and they're going to help you up skill I've just started using and I've already added a load of subjects to my list how to improve your writing skills and how to master drone photography how to jump like a chef or make that best cup of coffee have also found a course on beating procrastination which I'll probably get onto next week follow our link to get your first two months on Skillshare free and before long you'll be discovering how to create your own home business or how to crowdfund and Inventure one thing you won't find on Skillshare is how to create a tough tenant so we're going to go back to Robin now and see if he's got that chisel sharp enough yet [Music] [Music] who gets excited about things like this I do what I've got here is a fantastic marking gauge it's very sharp so ideal for soft words and what I'll do with that is I'll measure my shoulder I could put that inside our mortise I can run it backwards and forwards that will give me the exact depth there we go it's hard to see but I'll try an over mark it with a pencil but there is what we're going to take out and the same this side [Music] [Music] [Music] [Music] you [Music] so there's both parts of the joint formed the last thing to do is I'm gonna slot it together and I'm gonna mark for my hardwood wedges which is what cramps it together so it's a simple operation I'm gonna put the joint together I'm gonna slide it together dry and then what we're gonna do is we're gonna mark with a pencil nice sharp pencil where it's coming through and we'll take it apart now get the square now what I want to do is just mark that just inside so it draws it up nice and tight a few millimeters [Music] so I've got a lovely bit of Iroko here it's rock-solid we'll make a nice little wedge for that so I've got a really nice hardwood peg and that's gonna draw it up so I'm going to use that now it's gonna be not from the top to the bottom if I just position it and Mark my top my shoulder bottom for the mortise so the mortise is on the angle obviously the same as the wedge and then we're going to run that in the middle here that's what I'm taking out same on the outside and I'll drill that out first of all get rid of some of the stock so let's get it together now we'll put the hardwood wedge in and that is it job done that's it that's it this is timber technology from our forefathers it's something that I really value I've got plenty of other joints which I want to show you stuff that I use over my career and I really enjoy trying new ones as well so keep checking back for more traditional woodworking joints with skill builder and if you're not a subscriber now's the time to subscribe we cover loads and loads of topics and there's something just for you

Channel: Skill Builder

Views: 294,159

Keywords: How to Make a Tusk Tenon, tusk tenon joint definition, tusk tenon, Create a Tusk Tenon, timber frame tusk tenon, tusk tenon bookcase, tusk tenon bed, keyed tenon, mortice and tenon, robin clevett, mortise and tenon joint, carpentry lessons, carpentry tutorials videos, carpentry tutorial, carpentry tutorials youtube, wedged mortise and tenon, traditional woodworking, japanese joinery, hand crafted, hand made, Wedged mortise and tenon joint

Id: osoItQj_blw

Length: 14min 37sec (877 seconds)

Published: Fri Sep 27 2019