I have often pondered some sort of automatic grinding device where the tool it would rest against a very slow moving wheel and automatically shut off when the job was finished. That way you could set it up, start it running, and let go for several hours unattended.
I have seen and operated such devices a magnetic chuck holds the steel part you set depth of cut and it akes mutiple passes until the depth is reached. they are pricey tools but available used . It is called a surface grinder.
LOL
Tin