SCorrea Posted March 8 Report Share Posted March 8 Sharp tools are necessary to create solid glue joints. The FAA's reference work for Aircraft Repair is quite specific that sand paper never be used for preparation of any glue joint. The problem is crushed fibers which render the strength of the joint to be of a questionable nature. I really suspect that Violins are the same. Crushed fibers seem to be a thing that attenuates sound transmission and deadens the instrument. For the curious, I have included AC43.13-1B for your reading pleasure. 1-6. PREPARATION OF WOOD SURFACES FOR BONDING. It is recommended that no more time than necessary be permitted to elapse between final surfacing and bonding. Keep prepared surfaces covered with a clean plastic sheet or other material to maintain cleanliness prior to the bonding operation. The mating surfaces should be machined smooth and true with planers, joiners, or special miter saws. Planer marks, chipped or loosened grain, and other surface irregularities are not permitted. Sandpaper must never be used to smooth softwood surfaces that are to be bonded. Sawn surfaces must approach well-planed surfaces in uniformity, smoothness, and freedom from crushed fibers. It is advisable to clean both joint surfaces with a vacuum cleaner just prior to adhesive application. Wood surfaces ready for bonding must be free from oil, wax, varnish, shellac, lacquer, enamel, dope, sealers, paint, dust, dirt, adhesive, crayon marks, and other extraneous materials. Enjoy.. Quote Link to comment Share on other sites More sharing options...
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