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Laping my granite surface plate part 2

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hermetic:
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

edward:
Excellent stuff Matt

I'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!

mattinker:

--- Quote from: edward on May 06, 2020, 07:56:32 AM ---Excellent stuff Matt

I'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!

--- End quote ---

Edward, Glad you enjoyed it!

mattinker:

--- Quote from: hermetic on May 06, 2020, 07:47:09 AM ---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

--- End quote ---
Thanks Phil, how about several layers of granite counter top epoxied together? Should go a long way towards solveing the stability problem! You could also do the same with plate glass!

Matthew

WeldingRod:
If you laid up your slabs with air channel through it you could come up with an improvement!  The issue is not creeping over time, it's getting the whole thing to an even temperature.  Having air passages and a small fan would help a LOT.

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