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Malc2098":2y24u5x6 said:Thanks, Bob.
Yes, I realised I'd need an imperial bit or forstner.
G&S do a 150mm long 3/8" forstner.
I'm struggling to find long imperial drill bits.
9fingers":my9o8cj3 said:Malc2098":my9o8cj3 said:Thanks, Bob.
Yes, I realised I'd need an imperial bit or forstner.
G&S do a 150mm long 3/8" forstner.
I'm struggling to find long imperial drill bits.
Axi do 3/8" drills - you only need 85 mm plus a bit for the chuck should be within the scope of a standard drill length?
Bob





Dunno Andy, vertical ones are preferred as there's a longer wedging effect. I reckon from looking at the pics, that Malc could get away with a 10mm wedge or if that's too thick, an 8mm one - RobAndyp":8pzj5tft said:They look a bit thin for vertical ones.
Andyp":17do20si said:ABW = american black walnutDo keep up
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Correct Bob, but technically these are 'tusk' tenons which is a very different kettle of worms9fingers":2mo8sp4b said:Somebody once commented on the only wedged tenons that I'd ever done to the effect that the wedges should be at right angles to the grain of the mortice to avoid any tendency to split the grain.
Bob
Malc2098":2mo8sp4b said:Thanks, Gents.
I could manage an 8mm wedge downwards, but the wedge will be running with the grain of the leg. I'll have a closer look and try some tests on scrap.

Woodbloke":3ehqvwtb said:Dunno Andy, vertical ones are preferred as there's a longer wedging effect. I reckon from looking at the pics, that Malc could get away with a 10mm wedge or if that's too thick, an 8mm one - RobAndyp":3ehqvwtb said:They look a bit thin for vertical ones.
RogerS":1u0dyr1t said:Hw did that planing tip go, Malc ?
Woodbloke":zfobild4 said:Correct Bob, but technically these are 'tusk' tenons which is a very different kettle of worms9fingers":zfobild4 said:Somebody once commented on the only wedged tenons that I'd ever done to the effect that the wedges should be at right angles to the grain of the mortice to avoid any tendency to split the grain.
Bob
Those tusk tenons have been in that shelf unit for at least six or seven years and have never needed the attention of a tapometer to tighten them up. Once their tapped down firmly, they'll stay in place. I wouldn't bother with lateral folding wedges either as it only complicates matters, nor would I go with square pegs (in round 'olesMalc2098":sk6d4bwp said:Wow! Ideas running around in my head like kids at a party!
I get the theory of a vertical wedge while in use and with movement, shrinkage etc, as the wedge loosens it can fall down in the evolving gap, but I also like the idea of lateral folding wedges, too.
Any takers on square pegs for the feet and top rail M&Ts instead of round pegs?


Woodbloke":xh1svaod said:Tusk tenons look good; aim to get them equidistant each side of the mortice when they're tapped home...just needs careful planing, a shaving at a time, then tap and test. Or chop off a bit from one end- Rob
Yep, round over the outer corners of the wedges and take a chunk off the tenons; leave say, 40/50mm in front of the mortice. It's not crucial, just makes it look a bit tidier - RobMalc2098":26zc2e50 said:Four tusk tenons, their mortices and wedges done!
What do you reckon - round off the top and bottom outer corners of the wedges?
What about the tenons? Should I reduce their length and round their top and bottom corners?
Woodbloke":1wyhb1sl said:Perfick and to finish off the tenons, a small chamfer round the ends would complete that part of the job - Rob

