I decided to treat my self to a surface plate, couldn't believe how cheap they are, got a 400mmx250mmx80mm £78 delivered its granite which is cheaper than cast iron. Haven't used one since I finished my apprenticeship in 71, think I can still remember how.
According to the blurb its within 2.13 microns (Bit less than a tenth of a thou) centre to sides, which will be easily accurate enough for me.
According to the blurb its within 2.13 microns (Bit less than a tenth of a thou) centre to sides, which will be easily accurate enough for me.