This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Super Glue=20 Joe Goss imatunr@srvinet.com www.mothergoosetools.com ----- Original Message -----=20 From: Gevaert Pierre=20 To: pianotech@ptg.org=20 Sent: Saturday, June 15, 2002 1:01 PM Subject: Re: Doping pins. Dear list, What is CA glue? Are there different qualitys or brands that are better to use? Thanks, Pierre Gevaert. ----- Original Message -----=20 From: Billbrpt@AOL.COM=20 To: pianotech@ptg.org=20 Sent: Saturday, June 15, 2002 4:19 PM Subject: Re: Doping pins. In a message dated 6/15/02 8:47:25 AM Central Daylight Time, = ptuner@optonline.net (Matt Wynne) writes:=20 > > Matt, List:=20 > >=20 > > I may have missed a post or two on this thread, but is there = an advantage=20 > > to turning a grand upside down? I've used CA glue for loose = t-pins from=20 > > the topside only - and with pretty good results so far.=20 > >=20 > > Jerry Gravina=20 Jerry:=20 I like to flip grands because the CA is applied directly to the = pins and=20 immediately surrounding area. I haven't commissioned a study but = I imagine=20 that if you apply from the top, some glue gets absorbed by the = tuning pin=20 bushing. If I have room, it usually takes me under 5 minutes to = flip a=20 grand alone .=20 Although I rarely get involved with something like this, there is a = time and place for everything. There is a friend of many years who has = a Lyon & Healy grand that has been sitting around in unplayable = condition for about 10 years. It really needs rebuilding but there is = no way he could afford that. The soundboard and bridges are in flawless = shape.=20 Upon inspection, the pinblock looked good too with no visible = delamination but many of the tuning pins were uncontrollably loose. I = decided that this was a good candidate for CA glue pinblock doping. = Last weekend we did the doping job and today I will go finish the = project.=20 I look at it from a theoretical point of view: couldn't I surround = more of the pin more effectively by first turning the piano over and = doping from the backside, then from the top? Not only did this work = very well but upon doping from the backside of the pinblock, there was = some seepage through to the edge of the pinblock between the bottom two = laminations. This told me that even though the block was not *visibly* = delaminating, it was in fact very weak, enough so that the glue seeped = through.=20 The whole idea of using CA glue is that this substance will fuse = together any structurally weak parts of the block. The other kinds of = dope which are merely intended to swell the wood cannot provide any = structural strength the way CA glue does. Upon doing the first rough = tuning, each pin was stuck hard and took some real muscle to move it. = But afterwards, the feel was amazingly normal and smooth (not jumpy as = might be expected) with very high torque, about what you'd expect from a = new pinblock.=20 The hammers were worn enough to need replacing but the customer not = having enough to pay for that, I just decided to give them a good = filing. The let off was about 1/2" but after a good knuckle bolstering = job, it brought the let-off right up to where it should be with a few = hammers even blocking slightly. It lifted all the shanks off the rest = rail too. Today, I'll go over the regulation but I don't expect to have = to do a lot. I'll give it two more tuning passes (a total of 4). We = had to overhaul the pedal box but aside from that, just a few basics = like this will bring the old grand of fairly good design back to life = for a few hundred dollars.=20 Another younger tech who is still learning the trade is = participating and the customer himself did the doping. We had fans = blowing full force with all the windows open to evacuate the fumes which = were pretty intense at times. Like the recent thread on Spinet = Grommets, involving the customer of modest means and maybe another tech = who is learning the trade can be a way of lowering the costs to the = customer and having that person be really grateful.=20 Everyone enjoyed the session, we broke for lunch and another couple = of iced tea breaks which we'll do again today and have a very well spent = day. Tonight, undoubtedly, there will be music flowing from that house = all evening long.=20 Bill Bremmer RPT=20 Madison, Wisconsin=20 Click here: -=3Dw w w . b i l l b r e m m e r . c o m =3D-=20 ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/35/eb/08/bb/attachment.htm ---------------------- multipart/alternative attachment--
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