Terry said/asked: "1. Another Jig - Square Hammer (Terry Farrell) ---------------------------------------------------------------------- Message: 1 Date: Mon, 7 Jan 2013 19:50:25 -0500 From: Terry Farrell <mfarrel2 at tampabay.rr.com> To: pianotech at ptg.org Subject: [pianotech] Another Jig - Square Hammer Message-ID: <A78E6F0E-1BF3-4C75-AE02-06CC39188B1C at tampabay.rr.com> Content-Type: text/plain; charset="us-ascii" As long as we are sharing jigs........ Here's my desperation jig for hanging hammers for a square grand. The trouble I have found with the square is that shank length varies for each and every note. Also, the way the hammer core is trimmed seems to be unique to each hammer. I'm sure that the piano designer designed the piano to have equal-length shanks, but I find that if you want the hammer to hit the strings, for any given note, somewhere near the middle of the hammer, you need to measure by trial and error (and error and error and error.....) each and every hammer. So I make a little X at the apex middle of each hammer, install it in the piano, measure how far I need to increase or decrease shank length to center the hammer on the strings........... > Return hammer to jig and use the rule to measure which way and how far to move it the measured amount. > And then you re-install the hammer only to find that you installed it 1/100 of a degree different from when you measured it and the darn thing isn't centered again....... Joe - how on earth do you do this? THIS is not an easy task!!!!!" Terry, I think what you are doing is compensating for hammer clearance, but in the wrong way. Judging from the pics, it does not look like you are additionally trimming/sanding/??? each hammer before installing or doing this jig thang. (Correct me if I'm wrong<G>) The way I do it is to do every other hammer. I remove the "top action" and clanp the ends with Jorgenson Clamps and "C" clamps to the to bench top. NO, every hammer shank is not a different length! Can't stress that enough. There is exceptions to that, tho. The first 3-4 hammers, (i.e. A0, A#0, B0 & C1), are sometimes shortened, if it's a crappy Square to begin with. All should be the same length. Let me send some pics of the process. I did a whole montague of it a few months ago, with my last one done for another tech. (lucky you.<G> I'll put 2 pics per post Best, Joe Joe Garrett, R.P.T. Captain of the Tool Police Squares R I -------------- next part -------------- A non-text attachment was scrubbed... Name: First Download 8-6-12 041.jpg Type: image/jpeg Size: 534266 bytes Desc: First Download 8-6-12 041.jpg URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130107/b79fa42c/attachment-0002.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: First Download, 8-6-12 039.jpg Type: image/jpeg Size: 596664 bytes Desc: First Download, 8-6-12 039.jpg URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130107/b79fa42c/attachment-0003.jpg>
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