My guess in the Samick would be there is so much glue-to-wood ratio that there just isn't much surface into which the CA can soak. This was only a 20 year old piano, otherwise well kept and in good shape. les -----Original Message----- From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]On Behalf Of ed440@mindspring.com Sent: Wednesday, October 05, 2005 6:07 AM To: College and University Technicians Subject: RE: [CAUT] Anyone using UFO CA glue? Susan- But people also report good results.... There are so many variables. I would guess the Samick pinblock was drilled wrong, not worn out, split, dry rotted or softened by pin tightener. More likely drilled with an over-heated drill, leaving a burnt and glazed surface. My experience has been that even pulling the pin and swabbing the hole does not last if the hole is glazed. Ed S. -----Original Message----- From: Susan Kline <skline@peak.org> Sent: Oct 4, 2005 10:57 PM To: College and University Technicians <caut@ptg.org> Subject: RE: [CAUT] Anyone using UFO CA glue? At 08:06 PM 10/4/2005 -0500, you wrote: >I think I only did two complete pianos. A Baldwin M which had some kind of >"stuff" used on it years before. I turned it upside down and did it from the >bottom to almost no effect, though I have managed to tune it for the last >couple of years.... The other was a Samick upright, which I ended up >repinning. The stuff certainly was not good on the delignit. I've >"spot-shot" a few pins here and there on an old upright where two or three >pins just wouldn't hold. Actually, the humidity in Houston is not "that >bad". Yeah, it's not Arizona, but we do get some really dry weather. Now, >I have pulled a few pins, swabbed the holes, and redriven the pins- and that >has worked like a charm. I like that better than using epoxy. > >les Thanks, Les, that's very interesting. So, your spot repairs on the old upright worked just fine (exactly my experience, spot repairs on very old pinblocks), but turning the piano over and flooding from the back of the pinblock didn't. What was the trouble on the delignit? Didn't soak in? For that matter, why did a delignit pinblock go bad? Certainly not an old block. Simple looseness, or do you think there was delamination? The more I hear about and think about putting the CA into an inverted pinblock, the less I like the idea. On pianotech, we talked about the possibility of having a ring of CA form just past the end of the tuning pin, preventing it from proceeding further into the block if one wanted to tune it sharper. (I wonder if this is how the "tight pins got looser"? That the pin couldn't proceed further into the block.) When I picture how a loose pin is moving, I imagine it being held reasonably well at the base, but flagpoling at the top, pulled by the wire. If you think of a hole with a tuning pin in it, being pulled by a high tension wire, don't you think of the top of the hole enlarging more than the bottom? If so, putting the glue into the bottom is probably a mistake. The pin itself might keep the glue from migrating to the very top of the pinblock, which is the part most likely to be egged out. Well, that's my mental picture of what's happening. In all the recent discussions about CA in pinblocks, at least 40 or 50 posts, I can't think of a single one (except mine, maybe) which talked about the process by which people _decided_ to put as much glue into the pinblock as possible. Has anyone TRIED using less? If not, why not? Why did so many people start doing this procedure in basically the same way, without considering whether it might be a good way or not? When I hear of ounces and ounces poured on from the rear, presumably because the block will trap more of it from that direction, I wonder whether this is a semi-automatic conversion from the old pin tightener days, when we'd treat all the pins, and get as much in as possible. No one thought of the differences in the materials, and the possibility that less CA might work better, and the issue that CA in bulk is very toxic, and we're often using it in people's homes? sssssssnn _______________________________________________ caut list info: https://www.moypiano.com/resources/#archives _______________________________________________ caut list info: https://www.moypiano.com/resources/#archives
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