It would sound more like a distant freight train...loss of power... David I. -----Original Message----- From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf Of Farrell Sent: Wednesday, August 02, 2000 2:32 AM To: pianotech@ptg.org Subject: Re: Bridge gain delamination ">If there is a cap and it is not split, how would you see the seperation?<" I can't pass on this one: Gee Roger, if you can determine that a hammer flange pinning is at 4 grams rather than the preferred 6 grams just by listening to the not being struck, then can't you tell that a bridge is delaminated just by listening?????????????? ;-) I think that would sound perhaps like a freight train to those of you with the bionic ears! Terry Farrell Piano Tuning & Service Tampa, Florida mfarrel2@tampabay.rr.com ----- Original Message ----- From: "Roger Jolly" <baldyam@sk.sympatico.ca> To: <pianotech@ptg.org> Sent: Wednesday, August 02, 2000 12:32 AM Subject: Re: Bridge gain delamination > Hi Terry, > that's what I was thinking, with a fairly thin bridge cap that > exposes the laminations at the notch. > If it is an exposed vertical lamination like Baldwin then the fix I > suggested works well. If there is a cap and it is not split, how would you > see the seperation? > > Mystified Roger > > > At 10:54 PM 01/08/00 -0400, you wrote: > >Yes, but in this case Roger was making the assumption that there was a > >bridge cap.....like in a Steinway......... "<I presume the bridge cap is not > >cracked.>" > > > >Terry Farrell > >Piano Tuning & Service > >Tampa, Florida > >mfarrel2@tampabay.rr.com > > > >----- Original Message ----- > >From: "Don" <drose@dlcwest.com> > >To: <pianotech@ptg.org> > >Sent: Tuesday, August 01, 2000 11:51 AM > >Subject: Re: Bridge gain delamination > > > > > >> Hi Terry, > >> > >> Some grands don't have bridge caps. Therefore the vertical laminations are > >> quite accesseable. > >> > >> At 11:21 AM 8/1/00 -0400, you wrote: > >> >Roger: O Yee of Great Wisdom. I read these posts with great interest, > >always > >> >trying to learn about a situation before I run into it. In the post > >below, > >> >if the vertical laminations on the bridge have delaminated (I assume we > >are > >> >talking the main portion of the bridge below the bridge cap) and the > >bridge > >> >cap is not cracked, how do you get epoxy into and spread around in the > >> >vertically delaminated areas - isn't the bridge cap covering all this, > >> >rendering the delaminated area inaccessable??????? > >> > > >> >Terry Farrell > >> >Piano Tuning & Service > >> >Tampa, Florida > >> >mfarrel2@tampabay.rr.com > >> > > >> >----- Original Message ----- > >> >From: "Roger Jolly" <baldyam@sk.sympatico.ca> > >> >To: <pianotech@ptg.org> > >> >Sent: Monday, July 31, 2000 10:35 PM > >> >Subject: Re: Bridge gain delamination > >> > > >> > > >> >> Hi Patrick, > >> >> I am assuming that the splits are only in the vertical > >> >> laminations. > >> >> I have successfully repaired a number of Baldwin vertically laminated > >> >> bridges with separations. > >> >> > >> >> You need a few cabinet makers wooden handscrews. ( the wooden clamps > >with > >> >> two handscrews) The points of the jaws will allow you to slip down > >> >between > >> >> the side of the bridge and the plate. Or you can modify them on a band > >> >saw > >> >> so that you can get a good grip on the sides of the bridges.. > >> >> > >> >> Remove enough strings to give you room to work. Dry clamp the > >offending > >> >> area and see if you can draw the split together, usually no problem. > >> >> > >> >> Remove the bridge pins that have hair line cracks. > >> >> > >> >> I use West System thin epoxy. Swab the pin holes, and the split. > >Install > >> >> new bridge pins. > >> >> Tighten clamps. Clean excess with acetone. Leave for 24hrs to cure. > >> >> > >> >> If you have not used wooden handscrews. You need to practice a little > >> >> before you start. They have a good deal of clamping power once you get > >> >> used to them, and are less prone to marking or denting your work. > >> >> > >> >> Replacing the bridge pins is a personal fetish for this type of repair. > >> >But > >> >> the pin will act like a pump and fill your small cracks from the > >bottom. > >> >> > >> >> I presume the bridge cap is not cracked. > >> >> > >> >> Hope this is of help. > >> >> > >> >> Roger > >> >> > >> >> > >> >> > >> >> > >> >> > >> >> > >> >> At 11:57 AM 31/07/00 -0400, you wrote: > >> >> >Dear List: > >> >> >I just returned from a piano evaluation, for a customer looking to buy > >a > >> >> (32 year > >> >> >old) small model 350 Kawai grand, walnut veneer, for $4500. Everything > >> >> looked AOK > >> >> >EXCEPT: > >> >> >the bridge gain (cf. Mason, he also calls it the bridge core; I'd call > >it > >> >the > >> >> >bridge body) is separating along the diagonal joint 3-4 notes above > >the > >> >> >tenor/treble break. There's minor cracking of the bridge surface at > >the > >> >> bridge > >> >> >pins, but there's clearly been some glue joint failure at the joint in > >> >the > >> >> body of > >> >> >the bridge (the sides of the bridge are no longer flush, the joint > >line > >> >is > >> >> too > >> >> >prominent). No tonal deficiencies because of it (yet). > >> >> >I'm (optimistically) thinking I could fix this in the home by running > >> >> screws with > >> >> >washers through the separated parts, soak epoxy into the slight but > >real > >> >> >separation, etc. I'm hoping that with 2-3 sessions the bridge should > >be > >> >AOK. > >> >> >Have any of you had success with this kind of repair on other Asian > >> >pianos > >> >> (I've > >> >> >seen this as a problem area on all of their long bridges)? > >> >> >Or should I tell my customer to back out of the deal? > >> >> >Comments, Jim Jon Ron Roger et al? > >> >> > > >> >> Roger Jolly > >> >> Saskatoon, Canada. > >> >> 306-665-0213 > >> >> Fax 652-0505 > >> >> > >> > > >> > > >> > > >> Regards, > >> Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. > >> Tuner for the Saskatchewan Centre of the Arts > >> drose@dlcwest.com > >> http://donrose.htmlplanet.com/ > >> > >> 3004 Grant Rd. > >> REGINA, SK > >> S4S 5G7 > >> 306-352-3620 or 1-888-29t-uner > >> > >> > > > Roger Jolly > Saskatoon, Canada. > 306-665-0213 > Fax 652-0505 >
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