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Excellent stuff MattI'll admit that I use the sink cutout from my parents granite worktop and its proved OK of the kind of stuff I am doing. Its actually flatter than the 'good' bit of the bed on my 104 year old lathe!
Thanks Matt, enjoyed that! I thought when I saw one of the big youtube stars have a surface plate lapped that it didn't actually look that difficult! You have confirmed my suspicions. It would seem to be mot impossible to make your own surface plate from a slab of granite worktop and a lap. Stability would be a problem because of the reduced thickness, but horses for courses! I use a piece of 1/2" plate glass, and find it to be a lot more accurate than I am!Phil