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with the ganite, I got a very poor certificate (chinese stuff), it said the max deviation is 2,879um and the grade of presition is DIN00
Quotewith the ganite, I got a very poor certificate (chinese stuff), it said the max deviation is 2,879um and the grade of presition is DIN00Now they even can measure to nm! A 1/1000th of a µm. That should be DIN876 (out of my head) grade 00. Grade 00 is for calibration. Better than inspection or toolroom.But without knowing the size, it is hard to say what would be allowable for grade 00.You will soon discover that it is too small. I clean mine with light oil (like kerosene) or with a special cleaner (that smells a lot like a window cleaner).If you start scraping, under all circumstances ignore the stupid tip to use oil based prussian blue paint. The dumbest scraping related tip of the universe.Nick
Agree....don't like prussion blue/ High point blue at all!
And don't forget the fragrant orange bouquet wafting through the shop too
For minimum sag and distortion a beam like your surface plate should be supported at its Airy points. These are two points located symmetrically a distance of:
QuoteFor minimum sag and distortion a beam like your surface plate should be supported at its Airy points. These are two points located symmetrically a distance of:That's the theory.Practice is, that the plate should have the feet already installed or marked, exactly at the points where it sat while being ground. In practice, that won't be the Airy points nor the Bessel points.Nick
In practice, that won't be the Airy points nor the Bessel points.
QuoteFor minimum sag and distortion a beam like your surface plate should be supported at its Airy points. These are two points located symmetrically a distance of:That's the theory.Practice is, that the plate should have the feet already installed or marked, exactly at the points where it sat while being ground. In practice, that won't be the Airy points nor the Bessel points.
Why would they support a precision plate anywhere other than the Airy/Bessel points while grinding?
Hi Kevin,I know it's expensive...but I use WD 40 also...but then again..I only have a 12 x 18 plate Dave