Joe Garret is the man to contact about a published book of estimating guidelines. BTW I've cleaned and lubricated grubs before. But they aren't any more effective as bait. In fact, I think fish prefer them dirty and dry. Or did you mean grooves? Tee hee. Alan Barnard Should be Out Workin' in Salem, MO ----- Original Message ----- From: <A440A@aol.com> To: <pianotech@ptg.org> Sent: Wednesday, October 02, 2002 9:50 AM Subject: Re: Estimating guidelines? > Jason writes: > >and (help me with the term I can't think of) the moment after backcheck, > >when the hammers are supposed to rise an eighth of an inch before they > >drop back, the repetition springs are too strong and they bounce up almost > >to the string before falling. > > Greetings, > I don't know about 1/8" rise. After the hammer checks, the rep. spring is > supposed to be compressed enough to speed the return of the key. This is > measured by the speed of hammer rise as it goes from check to "drop". Since > drop is most optimally set at the same distance as let-off, (approx. 1/16"), > the distance from check,which may be 1/2" from string, will be closer to > 7/16". > You needn't set spring tension before ascertaining that the grub is clean > and lubed, the spring end polished, the balancier and hammerflange pinning is > correct, and the knuckle/mortise friction is proper. > Then set spring tension so that the hammer rises as fast as possible > without recoil being felt in the key. > That 100 year old Steinway may have the "silver" springs",(I don't know what > the alloy is). If so, be prepared for some breakage. > Good luck, > Ed Foote RPT > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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