Having flat stones in your machine shop just makes a lot of sense. Very often you need to knock down the high spots or nicks on your tools or equipment before use (vise jaws, parallels, 1-2-3 blocks, square, Bridgeport mill table, you get it, there are a lot of uses for these stones! But the stones you buy, like the Norton India Stone or the Harbor Freight stone I used, just aren’t flat. They are bowed, crooked, and can do more damage than good in your shop.
Actual precision flat stones are ground on a surface grinder with a Diamond grinding wheel. They are flat flat flat. Given the cost of the blade and the dressing tool, then the Norton stone blanks, you are better off spending the $250 for someone else to make them (Lance…).
But if you don’t want to spend $250 at this stage in your home shop, what can you do?
I used a standard grinding wheel and a cheap sharpening stone and came away with a really nice hobby grade of flat stones. They are flat, and make that nice sound that flat stones running on each other make.
For the work in my shop, these will be perfect. As I get better and need better tool, I’ll consider a true Precision set.
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Norton India Stone
https://amzn.to/45YqojL
My grinding wheel is : 9A 80 HB V52 made by Bay State Abrasives.