-----Original Message----- From: William R. Monroe [mailto:pianotech at a440piano.net] Sent: Wednesday, November 08, 2006 5:59 AM To: dnereson at 4dv.net; Pianotech List Subject: Re: wasted CA on grand pinblock Dave, How much CA did you use? It's about $10 for 2 oz., (and as I wrote earlier, I'd rarely use that much for an entire block) not real expensive in my book, if it can keep an instrument tunable till a rebuild is possible (or the piano is junked for other reasons). Yes, I did use almost an entire 2 oz. bottle. I'm just frustrated with buying CA glue and having it set-up solid in the bottle before you even get to use it all, and it's considerably more costly than other glues. Anyhow, yes, I probably used too much and that's why it leaked out and dripped down the flange. I did use a hypo oiler, but you can't really tell how much is going in there. The pins had all been driven in already, so the coils were quite close to the plate. I didn't want to glue the coils to the tuning pins or the strings to the plate, so I held the tip of the oiler right down in the hole. Aside from how fast the bottle is emptying, you can't really tell how many drops per pin are flowing out. -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org]On Behalf Of Frank Emerson Sent: Wednesday, November 08, 2006 8:49 PM To: Pianotech List Subject: Re: wasted CA on grand pinblock How do you know if there is a gap between the pinblock and the plate? I had a bright light, and with no tuning pin bushings, I could almost see the gap, at least in the few tuning pin holes where the pins hadn't been driven in. Tighten the pinblock screws. If you find that they can be tightened even a little, the gap described in the original post probably did exist, before tightening the screws. With about 20 tons of combined string tension pulling on the pins significantly above the top surface of the pinblock, the tension will pull the pinblock up to the plate at the stretch side of the block, and down, away from the plate at the plate flange side. This is encouraged by the draft angle of the plate flange (about 7 degrees), matched by the angle of a well-fitted pinblock. Even this slight angle of incline constitutes a ramp to further encourage movement in this direction. So you're saying the pull tends to create a gap between plate and block towards the flange side of the pinblock? I have no experience with CA treatment of pinblocks, but in light of the problem presented in the original post, I would suggest tightening and retightening all plate screws before CA treatment. . . . . . Frank Emerson pianoguru at earthlink.net -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20061109/f83375ca/attachment.html
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