Hi Del, You just tweeked my gray mattter, I can see the problem of the graphite out West starting to tighten bushings. Since in our neck of the woods it is not often above 40% RH inside the average home, the hydoscopic effect is not a problem. If fact at the University I can't ever remember it being above 35%. In summer the air conditioning certainly dries things down. I think Barrie hit the nail on the head when he mentioned the cost/supply factor. The respective companies will then extoll all the virtues, and never mention drawbacks. Regards Roger At 10:27 PM 6/6/99 -0700, you wrote: >Roger, > >I certainly agree with points 2, 3 and 4. Unfortunately, I have not found >their pinning to be all that consistent. I think it is probably the result of >the graphite used. Since graphite is somewhat hygroscopic these centers seem >to be somewhat susceptible to variations in moisture. We've also had more than >a few centers simply lock up tight after periods of hard play. About point 5 >-- I do not consider hornbeam to be a superior wood compared to reasonable >quality hard maple. But it sure does machine pretty. > >Del > >------------------------------------------ > >Roger Jolly wrote: > >> Hi Del, >> There is no doubt in my own mind that Renner shanks are superior to >> any other that I've used, But there is a lot of variable's 1. Most >> cosistent pinning, with graphite coating on felt, their pinning seems a >> little firmer than most. 2. Higher quality machining far less travelling >> required. 3. Superior grain orientation. 4. Higher quality knuckles than >> most. (less cup in the leather) 5.Finally Hornbeam. >> Now for the $64.000 question. Does the material's account for the >> difference, or is it superior machining tolerances? >> We have both studied Harold Conklin's film of hammer travel, it would be >> interesting to see a similar film made with both materials and identical >> machining tolerences. >> Another observation, when doing the drop/tone test on hammer shanks there >> are far less rejects from Hornbeam. Is this the material or the selection >> process? >> As I said before I'm going by gut feel. >> Nice to hear from you as usual. >> Regards Roger >> >> >> At 07:36 PM 6/5/99 -0700, you wrote: >> > >> > >> >Roger Jolly wrote: >> > >> >> Another variable is the quality of quarter saw and straightness of grain >> >> within the shank it self. >> >> I have a gut feel that is why the Renner Hornbeam shanks are superior to >> >> the maple. I may be out to lunch on that one, just guessing. >> >> Regards Roger >> > >> >---------------------------- >> > >> >And who -- besides Renner, that is -- really believes that hornbeam shanks >> are >> >superior to even relatively decent maple shanks? >> > >> >Regards, >> > >> >Del >> > >> > >> Roger Jolly >> Balwin Yamaha Piano Centres. >> Saskatoon/Regina. >> Canada. > > > > Roger Jolly Balwin Yamaha Piano Centres. Saskatoon/Regina. Canada.
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