Since it Duane's first pinblock, I would like to see if we could have some discussion about starting torques in new blocks of various provenance, especially the composite one he's got there. On my first block (delignit...1st and last), I carefully sized drill bits/speed/plunge speed/chilled to achieve a torque close to the final torque I wanted to end up with. I shot for 130inlb intitially, thinking it would drop a modest 20inlb to 110ish. Given the unforgiving nature of the delignit, though the holes were pretty consistent (within 25inlb), the subsequent torque drop significantly after stinging and 5 of years to 75-55ish. This obviously was significantly more than my projected 20inlb drop...and occasioned a repin. Granted this block was my personal experiment piano, so tensions were dropped on the whole block to mess around with the belly several times, but still I think I would have been much better off shooting for a higher initial torque, say more in the 175ish department. I've read through alot of archive posts regarding pinning and drilling, but initial torque overshoot is never mentioned. Can we get some input on this? Jim I -- Jim Ialeggio grandpianosolutions.com 978- 425-9026 Shirley, MA
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