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Waste not want not. A surface plate as a headstone, very fitting for an engineer.]Waste not want not. A surface plate as a headstone, very fitting for an engineer.
I all ways work to microns...............there may be a large number of decimal points involved ...but they are still microns!!!!
At my place of employment many years ago we had a largish Italian marble surface plate [approx. 3m x 5m] for re-assembly measurement of largish missile launcher components...... naturally it lived at a constant 22 20 degrees C & 16 % humidity..........the surface flatness was measured in uM [microns] The directions were quite clear.....it was very cold to walk on as one had to wear those synthetic sterile bootlets over cotton socks over bare feet as worn in hospital theatres..& no on the job.......Derek
I guess my real point was the use of the " stick and sand " papers on whatever surface you choose. Does not need to be a granite plate.Brian