Honing a carbide scraper

[Deny1950]

Hi just a few simple questions, can one use a smooth steel disc with diamond paste to hone a scraping tool or should one use cast iron and paste??? my other question is about a precision level, when laid flat on a granite plate should it have an arc to it ? Mine is an 18 in. and has about 6 thou in the center?? Thanks Denis

 

[astjp2]

My level is perfectly flat, but the Connley book should provide more information on levels. As far as sharpening, I use a diamond lap, Bebop uses the paste. Both work and should just be a matter of your preference. Tim

 

[Dresden]

Levels should be scraped dead flat for rebuilding, even machine levelling.
I have found the short master levels work very well but checking the surface where you level
need to be done as a burr can give false readings.

When rebuilding a Kingway gage is the most useful instrument ever made.

 

[4GSR]

The experts say it needs a slight concave surface, maybe .0015 to .002". Six thousandths sounds like a awful lot to me. Reason for it has something to do with heat transfer. I need to go check my precision level!