Thanks Jim! I'm interested in the input. I was thinking that I was shooting for an initial torque of 120 in-lb. But you've got me questioning that (which I considered to be "conventional wisdom"). Duane McGuire 801-830-5858 http://blog.duanemcguire.com On Thu, Apr 8, 2010 at 6:51 AM, jimialeggio <jimialeggio at gmail.com> wrote: > 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 > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20100408/4eeb75f9/attachment.htm>
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