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Gallery, Projects and General => Member Videos => Topic started by: mattinker on May 05, 2020, 05:02:34 PM

Title: Laping my granite surface plate part 2
Post by: mattinker on May 05, 2020, 05:02:34 PM

This is the final video on lapping my granite surface plate. I have been very surprised at how easy this is! I would like to encourage anyone that is hesitating to have a go!

Title: Re: Laping my granite surface plate part 2
Post by: awemawson on May 05, 2020, 05:22:37 PM

Excellent Matthew - great to see the end product - it seems ages ago that you were mapping it here on the course  :thumbup:

Title: Re: Laping my granite surface plate part 2
Post by: mattinker on May 05, 2020, 05:59:07 PM

Thanks Andrew, yes, it was two years ago last December! It took me a year to get back to it! and over a year to edit it!

I'm very pleased with the result, Duncan reconed it was a B plate when he measured it, it's a lot better now!

Cheers, Matthew

Title: Re: Laping my granite surface plate part 2
Post by: WeldingRod on May 05, 2020, 07:31:24 PM

Impressive!

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Title: Re: Laping my granite surface plate part 2
Post by: mattinker on May 05, 2020, 09:08:17 PM

Thank you!

Title: Re: Laping my granite surface plate part 2
Post by: 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

Title: Re: Laping my granite surface plate part 2
Post by: 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!

Title: Re: Laping my granite surface plate part 2
Post by: mattinker on May 06, 2020, 08:51:35 AM

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!

Edward, Glad you enjoyed it!

Title: Re: Laping my granite surface plate part 2
Post by: mattinker on May 06, 2020, 08:55:00 AM

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

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

Title: Re: Laping my granite surface plate part 2
Post by: WeldingRod on May 07, 2020, 01:46:11 PM

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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