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RE: Undercut Toneholes, Design and Customization

Author: David Spiegelthal
Date: 2001-04-13 19:00

I've found it beneficial (universally) to do some radiussing (the poor man's version of undercutting, if you will, using a gradually curved rim rather than a chamfer) on the bore side of toneholes, along with a very slight radius or chamfer on the outside (audience side) of the tonehole, to reduce turbulence as according to Arthur Benade. I've yet to produce any discernible deleterious effects by doing this, and I've certainly been able to clear up some stuffy sound and excessive resistance this way. And it can be done fairly easily, as long as one has a steady hand and is VERY careful, using just a small round file and/or Dremel tool (with small cylindrical honing stone) for the inside, and a 45-degree countersink (twirled by hand only!) for the outside chamfer. I'm a little mystified about the reluctance of many technicians to do these things. What are the harmful effects (if any) of doing a moderate amount of undercutting on previously-straight toneholes?

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