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1st May 2019, 01:08 PM #1
Hammering joinery before assembly?
Whilst sick in bed yesterday, I was looking through the back catalogue of Ishitani's videos and noted him, at times, hammering the timber before assembly. What is he doing? The only explanation I can come up with is that he's compressing the timber, to better expand with glue and remove any gaps in the completed joint. Is that the reason, and if so, is it a common technique? If that's not what's happening, what is he doing?
Fast forward the video to 10:20.
And this one at 3:30.
Ta,
Lance
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1st May 2019, 01:56 PM #2Taking a break
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I suspect your compression/expansion theory is right. It also looks like he's being careful to only strike the middle of the join, but not the edges.
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1st May 2019, 02:32 PM #3
Here is another reason for hammering wood from another master craftsman
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1st May 2019, 04:01 PM #4
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4th May 2019, 11:12 PM #5SENIOR MEMBER
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Lance,
Have a look at "DYI Japanese Joinery" on Youtube. (I don't know how to quote an address)
He demonstrate what he calls kirogoshi: hammering the joint before wetting it.
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5th May 2019, 12:24 AM #6
Basically what happens is same as the water pond box, the glue wets the would and swells back to size creating a perfect glue joint. Similar when you leave a divot in timber, wet it or use a damp cloth and iron the cloth on the divot, it steams it out, no more divot
The person who never made a mistake never made anything
Cheers
Ray
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5th May 2019, 09:22 AM #7
Further to this technique, I was assembling some joinery yesterday, and this was on my mind and got to wondering, in a tight fitting hammered joint, does the subsequent expansion of the timber have the potential to split a joint, or will the timber only expand to fill the housing? Or to put it another way, how much force can expanding wood fibres excerpt?
Perhaps it's experiment time!
Lance
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