In this video we make a round cast iron sanding plate for detailing machined parts out of an off cut disc of cast iron. Contrary to popular shop practice using a precision surface plate for sanding parts on is detrimental to its accuracy. This simple to build plate will save your surface plate for what it was intended to be used for which is making precise measurements. Having the abrasive fixed to the plate is the secret of this technique.
12 inch wide 25 yard roll 220 grit silicon carbide paper for square plates can be sourced from https://abrasives-south.com/
Check out Robins video on his Magic Surface Plate.
https://www.youtube.com/watch?v=0PzCie9pgPk