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25th November 2022, 11:58 AM #1GOLD MEMBER
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How would you cut these mortices?
Nathan Day Design on Instagram: "Joinery detail. Last dining table of the year. Custom designed torsion box table for @staple_design in American Oak. I've had this design tucked away for ages. It's a hybrid of a couple of our other tables. Nice to finally see it come to life. #customdesign #handcrafted #joinery #torsionbox #furnituremakers #oakdiningtable #madeinmargaretriver #margaretriverregion"
Nathan Day Design on Instagram: "Minimal but technical. This custom 2.8m dining table for @staple_design, is built as a torsion box that's skinned with thick Oak veneer. The torsion box is built similar to an aircrafts wings and the result is a relatively light weight, rigid and self supporting structure. It's a nice way to build a table. Legs on the corners, out of the way, no rails to knock knees on and no base in the way of anyone. It's just time consuming compared to a normal, solid timber table. Definitely worth the effort though I reckon. 3 In a row for @oldmanjonesy 🛠️#handcrafted #torsionbox #diningtable #handcrafted #australiandesign #margaretriverregion #madeinmargaretriver #furnituremakers #joinery #detail #perthfurniture"
On the table side. I imagine you couldnt really use a router as you would loose so much depth
Also - thoughts on threaded rods+epoxy as floating tenons?
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25th November 2022 11:58 AM # ADSGoogle Adsense Advertisement
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25th November 2022, 01:13 PM #2GOLD MEMBER
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Horizontal borer.
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25th November 2022, 06:30 PM #3
Are they floating tenons? or are they a hybrid joint version of floating tenons with a cross dowel nut & connector joint; or a threaded insert & bolt; or say a bolt and barrel nut? The timber may well be floating tenons fixed on one end only with the "bolt" making the joint fast.
It may well be a means to make the items "flat pack" for shipping etc.Mobyturns
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26th November 2022, 08:12 PM #4GOLD MEMBER
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He has said in comments before that they are glued in with epoxy
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27th November 2022, 10:30 AM #5Taking a break
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27th November 2022, 12:54 PM #6SENIOR MEMBER
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`
As per rustynail. Horizontal borer would be accurate and the way this was done. Drill the holes before you shape the leg.
Or a dowelling machine like the Triton doweller with one bit removed to start the hole, then finish it with a cordless. Fiddly and rough/bodgy, but a last resort.
A
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27th November 2022, 05:04 PM #7
Nathan Day Design.jpg
Originally Posted by qwertyu
Sam Maloof had a more sophisticated version of that joint on his tables and a far more sophisticated version on his chairs - he used large wood screws, and then plugged the holes.
... Also - thoughts on threaded rods+epoxy as floating tenons? ...
One. Put a screw into timber and apply enough force, and the screw will pull out
Two. Drill a small hole in timber, and epoxy a screw into it; apply enough force, and the screw will still pull out.
Three. Drill a hole double the diameter of the screw, fill with epoxy and insert the screw. Then apply enough force and the screw will probably break before it pulls out of the timber.
The magic number is that the hole should be at least double the diameter of the screw. They also discussed effects of depths of holes and types of timber.
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27th November 2022, 09:43 PM #8GOLD MEMBER
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27th November 2022, 10:17 PM #9
He's using a domino by the looks of his previous posts . They are home made, probably Jarrah ones he may have made. We're just looking down on them and not seeing the elongated view in that shot. In other posts, Domino brand tenons can be seen.
He either Dominos the rails before gluing up the top frame or the Domino is jigged to do the table top once assembled.
What Id like to know is how he tightens the bolt when it comes to glue up time. The only thing I can think of is . The torsion box top would have two skins . One on top and one underneath . He says he Vacuum presses the skins on in two goes in other posts. He must tighten the bolt for leg glue up with just the top skin of veneer on and then adds the second bottom skin on last . Which means the vacuum press cant be used because you cant bag the under side of a table top with four legs sticking up. Or Maybe you can by cutting legs out and sealing around each corner ? Pretty tedious . I have a bag and pump set up that uses a yellow putty to seal the sheets which is how some fiber glass boat builders use vacuum bags .
Nathan seems pretty generous with answers to questions about his build techniques in his posts.
Asking him seems like it would be a good idea .
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28th November 2022, 11:16 AM #10
Both explanations seem credible, Haveabeer and Auscab.
But it still leaves the basic questions:
- If you are using Dominos, why do you need the bolt, and
- If you are using the bolt, why do you need Dominos?
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28th November 2022, 03:24 PM #11
It seems like a great way to clamp the legs in position on glue up . Probably the best way . Clamping them from the outside looks hard . And steel in tension like that adds strength to it .
F897FEBA-1149-4C49-A4B1-D9E4430DB724.jpeg
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28th November 2022, 09:23 PM #12GOLD MEMBER
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28th November 2022, 10:21 PM #13GOLD MEMBER
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I dont think he is using the threaded inserts for clamping/tightening - there are other posts of legs with multiple threaded inserts. Im pretty sure he is using them for strength
The timber is floating tennons. I dont understand how would cut mortices. They are vertical and the table side they are in a concavity, the large domino has 70mm depth so you would have to plunge quite a bit before you even hit timber. A jig would also use up valuable thickness.
When it comes to horizontal borer - can they cut vertically too? Can they cut 2x mortises at the same time? Alignment would be pretty difficult if having to cut individually I think.... It would also require you to bring the table top to the machine and line it up pretty accurately
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28th November 2022, 10:37 PM #14GOLD MEMBER
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I saw in a comment on another post he uses something called the 'multi router' for another type of torsion box table. I cant see how it can work with this table where the mortises on the table top sit within a concavity. Can you get spiral upcut bits that are super long?
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28th November 2022, 10:43 PM #15Taking a break
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Oh man the Multi Router is an awesome bit of kit if you can afford it. Carbitool used to make extra long spirals, my old work has some 3/8" up-cut with a 2" flute (I think 4" total); don't know if they're still a stock item, but I'm sure they'd make to order.
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