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15th August 2017, 10:13 AM #16
Dunno about "rough as guts", WP, I imagine you do want the thing to stay together? While a few gaps won't detract significantly from the joint strength, I would definitely want most of my pins & tails to fit closely. It seems to me that of the dovetailed joints I've seen let go, the vast majority were a sloppy fit. I don't think any glue should be relied on to fill voids when joint-strength is a major consideration. I watched the relevant part of the video & it looked to me like the bloke was cutting those pins pretty accurately - practised hands can make some things look like child's play that we who are less-skilled struggle with, after all.
I'm talking from very limited experience, and it is quite a while since I did the last set, but as I remember it, cutting the pins & tails wasn't much more difficult than doing 'ordinary' half-blind d/ts, just a bit more tedious because neither pins not tails are 'through' & both have to be part-sawn, part chiselled out. Transferring the pin marks off the tails was trickier, because of the more restricted access for a marking tool. In situations like that, I use this half-knife, half scratch-awl ground from an old 3-cornered file rather than a marking knife: Scratch awl mod.jpg
You can only do a partial dry fit until the mitres are trimmed. If you've got a few sets of half-blinds under your belt, you will have some feel for that. I didn't want to trim the mitres while I was chopping the pins & tails because the sharp corners would be too easy to damage, but you can pare away a bit, to give you a better view of things. The most challenging part for me was the final trimming of those narrow mitered edges, all of which have to be near-perfect or it will spoil the job. I did most of it with a paring chisel, then I used a shoulder plane (very slowly & carefully) to true the last few thous across the mitres 'til it all fitted seamlessly. You have to sneak up very carefully on the final bit - if you over-shoot, there is virtually no fix other than starting over.
This is the result of one of my efforts - as you can see, it's quite small (~350mm on the long side), but it's the most ambitious set of full-blinds I've tackled so far! Box2.jpg Box1.jpg
Cheers,IW
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