Julia, I don't. I start with a 19 or 20 and insert into the birdseye by hand. If the pin slips through I move up to the next size(s). When I can't push the pin through with my fingers that's my size pin. Same deal with the reamers. Start small, ream both sides and test the pin for the right "feel ". (Both sides should have the same friction) If the pin feels too tight in the bushing, don't force the issue, just move up one reamer. Pin the parts together with the inserter and do the swing test or gram resistance test. If I have multiple parts to repin I go with this pin-reamer setup and move right along testing each part for swing as I go. How tight, how many swings, how many grams ,on what part and on what piano, using protek or alc and water for friction and sizing is a whole treatise in itself ! Before the straight reamers came along we used a tapered reamer followed by a burnishing tool . Consistency was much more difficult and time consuming. Cheers to Don Mannino for his reamer kit! Tom Driscoll RPT _____ From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of KeyKat88 at aol.com Sent: Monday, February 16, 2009 11:55 PM To: pianotech at ptg.org Subject: [pianotech] Miking center pins and broach set Greetings, Does anyone else out there mike their center pins? I had an instructor at UWO who always miked his. He said that he found that pins can vary in size. I miked my broaches too and gaging by the way my broaches feel sliding through the mike jaws (with a very slight resistence, the Schaff #21 pins mike at .0525! Are broaches .0005" larger than center pins? Sure seems that way. Thanks in advance, Julia Gottshall Reading, PA _____ Need a job? Find <http://yellowpages.aol.com/search?query=employment_agencies&ncid=emlcntusye lp00000003> an employment agency near you. Internal Virus Database is out of date. Checked by AVG - www.avg.com Version: 8.0.233 / Virus Database: 270.10.15/1921 - Release Date: 01/28/09 06:37:00 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech_ptg.org/attachments/20090217/aaf8a30d/attachment.html>
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