Traditional Making of Granite Surface Plates?

[applebuilder]

What was the traditional way of making granite surface plates back during WWII? Was it a hand operation like scraping metal plates using three separate pieces to reference against each other?

[the4thseal]

yup

[applebuilder]

How would you scrape granite?

[keith20mm]

Old thread... but...

Surface plates were/are/can be touched down with an overhead grinding wheel.

Guy Lautard covers the making of surface plates in The Machinist's Second Bedside Reader.