Stan, I'm grinning because today I used abrasive cord (1000 grit I special ordered) on an L I'm restringing. I simply didn't want to take out the agraffes. But if I take them out, I do the Q-tip thingee. JB From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of Stan Kroeker Sent: Friday, September 25, 2009 8:18 AM To: College and University Technicians Subject: Re: [CAUT] Polishing Agraffes ... enjoying the discussion! Hi all, This discussion reminds me how taking care of the plethora of small details results in a big difference in the final product. We have the freedom to do these things, don't we? I recall heated discussions in past about fitting pinblocks to plate flanges. How close is close enough? 0.020"? ... 0.010"? How about contact along the entire length of the flange (or at least once every inch)? Whether you believe the block can or can not move once it's securely screwed to the plate web, by achieving a full-fit you have forever eliminated movement as a potential cause of tuning instability. Re: agraffe servicing I neglected to mention that I'm not sure yet whether I prefer the use of hourglass-shaped reamers or abrasive cord to remove burrs from old agraffes or re-profile new ones (I have both). I keep coming back to the abrasive cord for its simplicity and minimal risk. You see immediately (by 'shoe-shining' the holes) that you are removing metal but it's hard to overdo it. Another advantage of the abrasive cord is that, after machine polishing, the cord effectively cleans out any residual compound from the recess. With this method, I don't bother polishing the holes/recesses. Simply a case of diminishing returns. Thanks again to all for your contributions on this subject! Regards, Stan Kroeker, RPT -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/caut.php/attachments/20090925/b798cad0/attachment.htm>
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