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RE: Be carefull of Vitos

Author: Gordon (NZ)
Date: 2001-04-26 10:04

I am reluctant to trust adhesives alone to repair broken tenons, I insert six 1.2 mm diameter stainless steel pins, about 30 mmm long across the break, into the wall of the instrument, and glued along their entire length. On broken sockets I use 7. Any evidence of their existence is difficult to detect. I've done this perhaps 50 times and never been let down. It is considerably cheaper than joint replacement, and the result stronger than a replacement. It takes me about an hour.

Ron you can't really add a radius back after production. But what is actually stronger than having a sharp corner at the bottom of the 'walls' is to cut a cave-like semicircle into the bottom of the wall. It looks as if it would be weaker but it is sronger. I've never seen it done, but it would be easy to do with a lathe.

You ask, "Does the sharpness of the tenon *cause* a fracture in that area? " It does not cause it, but it makes any external cause, eg being sat on, much more likely to succeed in breaking the instrument.

I have a few Armstongs that have broken in half at the thumb vent. Presumably it was a too tight fit and themn when the plastic shrank in winter the plastic could stand the stress no longer.

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Be carefull of Vitos new

joseph o'kelly

2001-04-23 23:21