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Some extreme Lapidary

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minerken Cave Dweller Member since August 2013 Posts: 466	Some extreme Lapidary Jan 21, 2016 13:49:11 GMT -5 jamesp, DirtCleaner, and 1 more like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by minerken on Jan 21, 2016 13:49:11 GMT -5 some may find this interesting not to Nasa or telescope standards but still extreme.

Pat misunderstood rock expert Member since February 2012 Posts: 11,827	Some extreme Lapidary Jan 21, 2016 15:02:26 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Pat on Jan 21, 2016 15:02:26 GMT -5 Interesting. Sometimes measurements must be perfect!
	Pat

Drummond Island Rocks
no longer being taken for granite

Member since October 2011
Posts: 8,913

Some extreme Lapidary Jan 21, 2016 15:44:59 GMT -5

Quote

Post by Drummond Island Rocks on Jan 21, 2016 15:44:59 GMT -5

We have several 4ft x 8ft x 10" thick Starrett surface plates in our CMM checking rooms at work. They need to be certified every year to meet our customers requirements and the flatness tolerance is .002000"

Each plate weighs 7,000 pounds but we do put 25,000 pound blocks of steel on them. Neat video.

Chuck

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minerken Cave Dweller Member since August 2013 Posts: 466	Some extreme Lapidary Jan 21, 2016 22:15:56 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by minerken on Jan 21, 2016 22:15:56 GMT -5 that's some serious weight do the surface plates show any compression what are the plates mounted on?

Drummond Island Rocks
no longer being taken for granite

Member since October 2011
Posts: 8,913

Some extreme Lapidary Jan 22, 2016 9:42:41 GMT -5

Quote

Post by Drummond Island Rocks on Jan 22, 2016 9:42:41 GMT -5

Jan 21, 2016 22:15:56 GMT -5 minerken said:

that's some serious weight do the surface plates show any compression what are the plates mounted on?

I was wrong about the size. The size is more like 5ft x 10ft x 2ft thick. I dont have pictures from the current shop I work for but here are a couple pics from the last shop I worked for.

Check out the size of the granite and highly calibrated. We set plastic injection molds on those and take digital dimensions that have to be within crazy tolerances.
Granite weighs about 165 lbs per cubic foot so each of these tables is about 20,000 pounds. Probably come from jamesp's neck of the woods.

This is a picture of a large plastic injection mold. This one weighed about 75,000 pounds so each have when checked on that table would have been over 30,000 pounds.

Chuck

Last Edit: Jan 22, 2016 14:15:09 GMT -5 by Drummond Island Rocks

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Fossilman Cave Dweller Member since January 2009 Posts: 20,722	Some extreme Lapidary Jan 22, 2016 9:58:26 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Fossilman on Jan 22, 2016 9:58:26 GMT -5 Thank you for sharing,interesting,yes,it was!
	God,family and life.....

jamesp
Cave Dweller

Member since October 2012
Posts: 36,602

Some extreme Lapidary Jan 22, 2016 14:36:19 GMT -5

Quote

Post by jamesp on Jan 22, 2016 14:36:19 GMT -5

Need for perfection starting to make sense now. that is one big block of machined steel.

Not sure where that Starrett stone comes from.

Some press sections of paper machines have granite rollers that spin very fast. I think they have to take up to 3000 pounds per linear inch of pressure with out deflecting.

Last Edit: Jan 22, 2016 14:37:30 GMT -5 by jamesp

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Some extreme Lapidary

Post by minerken on Jan 21, 2016 13:49:11 GMT -5

Post by Pat on Jan 21, 2016 15:02:26 GMT -5

Post by Drummond Island Rocks on Jan 21, 2016 15:44:59 GMT -5

Post by minerken on Jan 21, 2016 22:15:56 GMT -5

Post by Drummond Island Rocks on Jan 22, 2016 9:42:41 GMT -5

Post by Fossilman on Jan 22, 2016 9:58:26 GMT -5

Post by jamesp on Jan 22, 2016 14:36:19 GMT -5

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