Hmm, Ok, I have been using homemade chasers instead of reamers, who knew? The K bit that I use to chase a Steinway 2/0 block prior to repinning with 3/0 pins manages to cut something out of those holes with the cutting edges I left in the middle of the bit. Especially down at the bottom, where there is often uncompacted pin block holes drilled for the 2/0 pins. I don't know what is being sheared off the inside of the holes, but there is wood removed when I do this, even though the bit is supposedly smaller than the hole should be. Regards, Ed Foote RPT http://www.piano-tuners.org/edfoote/well_tempered_piano.html -----Original Message----- From: Jim Ialeggio <I have made my own pinblock reamers from bits in which I grind away all the cutting edges for the first inch or so of the bit. It makes for an accurate pilot without chewing a sideways hole on the way in. This is interesting and makes a lot of sense. So, what exactly is the cutting action of a reamer? Is is simply a scraping action? If so, what keeps the 1st hole's wall fibres from just bending over rather than actually being sheared off ? -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130307/ab390673/attachment.htm>
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