> You can get a factory finish if you use a straight line air sander. National Detroit and Nitto make affordable models. I've had my ND #600 for 30 years, had it rebuilt twice, and it works as good as new. Be sure to use the hard felt pad, not the rubber one that comes with the unit. The rubber pad conforms to the surface, it doesn't level as well as the hard felt. Level sand with #220 every third coat, and level sand with #320 on the second to last coat. Level sand the raw wood thoroughly. If you're doing a black finish, sand at right angles against the grain as well as with the grain. Arthur Grudko www.pianolac.com I recall that machine being able to flatten a piece to something like >.010". I think that's higher precision than most wide belt sanders, but >otherwise it's just like you can buy from any major machine supplier. I >think it was made in Italy. > >They also have an incredible, huge orbital buffing machine, with three >big buffs on a carriage which revolves, while the whole thing moves >linearly over the length of the piece, such as a lid. The size was >eye-opening. > >-Mark > >Albert Thomas wrote: >> Thanks Mark Schecter for the links: in part three of "Touring the >> factory" they are running lids through an electronic sander. Elaborate >> on this, anyone? ....and assuming that is an "absolute >> flatness/levelling" device, any way we can approximate that level of >> measurement in a small rebuilding shop? Laser beams , etc.? >> >> Albert Thomas, B.M., M.M. , Associate Member PTG >> Auburn University >> Thomas Piano Service >> _______________________________________________ >> pianotech list info: https://www.moypiano.com/resources/#archives >> >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives >
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