>> " >> The easiest thing to do in all these cases is to ream the guide rail >> hole more.''... Hey Jessica, sounds like the tray has moved a bit....? Lot's of work.... I like to attempt to reduce excessive friction without reaming, if possible.....The easy way is to... Load up the china bristle brush with Teflon, remove the action, and brush on the powder to all of the wires, right below the bushings.....(.the powder will make its way around the back of the wire, probably by some electric static charge) Then, mechanically push a group of the wires up,left, right, to transfer the powder to the cloth...then..Test on wire by feel...Is it dragging? Keep in mind, I'm from the 'if it moves, it gets Teflon' school of reducing excessive friction.... Another thought on the floor.... A grands three points of floor contact should lessen the stress that would effect a 4 footed critter....Unless there is such a radical bow as to force the legs apart, thus bowing the bed. oh what fun. Dan Dallas, Tx On May 22, 2008, at 10:16 PM, Barbara Richmond wrote: > Jessica, > > Has someone been dusting/cleaning--even spraying something on the > damper heads-- and wiping in the wrong direction? > > I had to do a lot of damper work on a piano that resided in a > house with heavy pipe smoke. I suppose Presbyterians don't use > incense. :-) > > How about ironing some Teflon powder into the bushings (and cleaning > everything else). > > Hmm. It doesn't seem like the floor would make a difference on a > grand. We lived in an apartment where the floor dipped and the > sewing machine cabinet would roll to the middle of the room. :-) > > Are the compression ridges something new? How old is the piano? > > Sorry, I can't remember the Yamaha damper/damper tray set-up at the > moment. Can you shim to get the lift even? > > Barbara Richmond, RPT > near Peoria, Illinois > > > ----- Original Message ----- >> From: Jessica Masse >> To: pianotech at ptg.org >> Sent: Thursday, May 22, 2008 3:31 PM >> Subject: RE: Pianos on curved church floors >> >> I have been taking care of a C7 Yamaha in an old Presbyterian Church >> with curved floor. It has a complete climate control system properly >> functioning. I have had much trouble with climate stability in this >> room but now that the two churches sharing the piano have made sure >> the piano’s floor length cover gets replaced in between uses the >> changes seem less dramatic. >> >> However there seemed to be damper problems in the spring summer >> months. The damper tray goes from lifting all at once to being to >> fast in the middle. Today I went to tighten tray screws and found >> them all so-so. So I tightened them all and the sustenuto rail >> screws. In doing so with the tray screws I tried to force the tray >> level. The dampers at both ends still lift too soon. But also a few >> dampers in the middle seem not to seat properly. >> >> Remember this piano is on a curved floor and from Bass end to Treble >> end I figure it tilts 1-9/16”. I used silk thread tied to gram >> weights as a plum bob measured down the rim was (5-16th for 12-3/4”) >> Piano leans to the Bass end. Two things visually can be seen the >> trichord felt is sliced a bit off centre, the other is that the flat >> felt has drifted to the bass end and is almost missing the right >> string. Testing the strings by plucking the bass side was bleeding >> through. I’m figuring I am seeing excessive depression and poor >> centering of the dampers in the tenor C#-4 and D#-4 both trichord >> felts on the back of damper head wouldn’t fall down completely >> between the strings only on soft blows but dampen okay on a harder >> blow they seem to work okay with the pedal (no hanging up). >> >> I replaced the trichord felt only on D#-4 (the most offensive one) >> and rebent the wire to pull the flat felt back to centre position >> (bent at the top two bends closest to the head) so that the flat felt >> would cover the right string. I made sure that the wire was free >> enough through the guide rail and I leveled the strings. It dampens >> better now. >> >> On the C#-4 I just made sure the wire was free and the timing was >> okay. I didn’t even notice when I started today that this one was a >> problem. I didn’t get this one working as well as it should be. >> >> What I will have to do is replace all the trichord felt and centered >> and space the wires for the notes with combined trichord and flat >> felt. The remaining 3 notes in the top of the tenor are flat felt >> on both front and back of the heads. These are not working properly >> either. The right strings are almost cleared. >> >> The damper wires are nickel plated and they show a black line (can be >> easily wiped off) where they contact the guide bushing. The bushing >> cloth is very heavy. >> >> There are two things that seem wrong here. There are very noticeable >> compression ridges in the sounding board and I wonder if the belly >> rail is affected too causing the damper guide rail to rise and the >> dampers to go uneven in the middle and also for them not to rise and >> fall less far because the strings might move up too. (if this were >> true wouldn’t the dampers track to the right string but maybe because >> the guide rail moves to the right the angle change forces the damper >> to the left. I know that these things are all corrected by winter >> and I can’t be by the piano’s side to make sure it keeps getting >> covered up. (The easiest thing to do in all these cases is to ream >> the guide rail hole more. But I hate too much movement in the >> dampers all that extra noise and it won’t fix the pacing problem. >> >> I am wondering has anyone else had gravitational/friction problems >> with grands on curved floors? Could this effect the wear on keys and >> dampers and action centre pins? Doesn’t it make sense to level out a >> piano than run these risks? >> >> To be honest they had built a leveling stage that rolled around >> (Chrysler engineer is a parishioner). Then, they removed the piano >> from the stage. I think the piano functioned better on the stage. I >> am recommending that they level out the piano before I go through all >> the work on the dampers. >> >> Jessica Masse >> RPT Piano Technicians Guild >> -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: text/enriched Size: 9919 bytes Desc: not available Url : https://www.moypiano.com/ptg/pianotech.php/attachments/20080522/4a27f3c8/attachment.bin
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