How does one check the amount of bearing under the pressure bar and what should it be? David Ilvedson, RPT Pacifica, California ----- Original message ---------------------------------------- From: ed440@mindspring.com To: "College and University Technicians" <caut@ptg.org> Received: 10/8/2005 4:53:19 AM Subject: RE: [CAUT] Grease/Oil on upright pressure bar >Andrew: >Your best chance of saving the current strings will probably be by loosening tension, >removing the pressure bars, and cleaning the bars and strings with rags and a solvent if >needed. This will be less labor than trying to clean under the bars with q-tips and rags, >and more effective. Be careful it does not migrate to the pinblock. >Someone mentioned checking the amount of bearing under the pressure bar, and that >is good advice. >It would be desireable to identify the lubricant before proceeding, and to have >records(photos and samples) in case it migrates and destroys the pianos. Please be >sure the faculty knows that this looks serious, and that you are trying to save the >instruments. >Some years ago I worked behind a self-trained technician who lubricated the bridge >tops with silicone paste. As it migrated, it ruined all the bass strings. No one in the >school thought it was odd, since all the pianos had thumping basses! "We're just a >poor college with worn out pianos." >Ed S. >-----Original Message----- >From: Andrew Anderson <andrew@andersonmusic.com> >Sent: Oct 7, 2005 8:35 AM >To: ilvey@sbcglobal.net, College and University Technicians <caut@ptg.org> >Subject: RE: [CAUT] Grease/Oil on upright pressure bar >Most do have evidence of lubricant to a greater or lesser >degree. The one that was the worst, so far, had terrible unisons >when I got to it. (I think the lubricant got all the way to the >bridge in the treble.) >The pin block is tight, the pins are "springy". The average humidity >is 60% Rh right now. In Laredo there aren't any mountains between us >and the cost so it doesn't get terribly dry >relative-humidity-wise. Think south-Texas. >So, this is a foreign substance. What is the least damaging way to >get it out? I've mentally debated trickling various solvents down >the wires over the bar into a rag below. I don't like that >idea. Another that came to mind is using the heat gun to mobilize it >with heat and forced air out of that position. That also has its >drawbacks, maybe less so than the first idea. Anyone have tested >ideas or want to hazard some opinions? >PRN =/= as needed >TAMIU = Texas A & M International University >Andrew Anderson >At 07:59 PM 10/6/2005, you wrote: >>Sorry for my ignorance but explain: PRN? TAMIU? If all of the >>Bostons, or majority of them have this stuff...sounds like someone >>lubed them. The factory isn't going put something in the piano >>that attracts dust/dirt. These are basically Kawais. You could >>have dried out pinblocks...Texas. Seems to me Avery can talk you >>through this... >> >>David I. >> >> >> >> >> >> >>----- Original message ---------------------------------------- >>From: "Andrew Anderson" <andrew@andersonmusic.com> >>To: "College and University Technicians" <caut@ptg.org> >>Received: 10/6/2005 5:24:07 PM >>Subject: [CAUT] Grease/Oil on upright pressure bar >> >> >> >Hi, >> >I'm tuning on a PRN basis for TAMIU here in Laredo. They finally >> >decided their black cages full of warbling songbirds and howling >> >seals needed a little discipline. (The grands are better, 50 to 80 >> >cents sharp on the top octave though, every piano.) >> >> >They have a bunch of Boston uprights (UP-125 II) that are proving >> >quite annoying. There is very little discernable friction between >> >the tuning pin and the speaking portion of the wire. I got >> >suspicious, went to the restroom and got some white paper. Swiped >> >the wires, yellow stuff, swiped the underside of the pressure bar, >> >more yellow stuff. Not very thick, but collecting dust anyway. When >> >I massaged the wires with the beat suppressor after the first pitch >> >correction pass I noticed that the wires were collecting a little >> >dust too, sticky. ... These are fairly new pianos, couple years at most. >> >> >When I say low-friction, I mean I can put my little hammer vertical >> >on a pin and walk a unison above and below tune without stressing my pinky. >> >> >Is this normal? Making unisons stable is a bit of a chore. No >> >wonder they were warbling & howling. Do they come from the factory >> >this way? or did one of the past piana toonas oil everything up? >> >> >Over lubricated in Laredo, >> >Andrew >> >> >_______________________________________________ >> >caut list info: https://www.moypiano.com/resources/#archives >>_______________________________________________ >>caut list info: https://www.moypiano.com/resources/#archives >_______________________________________________ >caut list info: https://www.moypiano.com/resources/#archives >_______________________________________________ >caut list info: https://www.moypiano.com/resources/#archives
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