On my chessboards I use the method Stig suggested - heated brass stamp.
Mine is very simple, but you can get some very detailed ones. Downside, it's not cheap.
From my experience case hardening is more trouble, more expensive, and the results aren't as good as just buying and using O1.
Cromwell Tools Flat Stock
(Edit - Would a small case-hardened mild-steel die cope with up to 2 tons of pressure?).
I don't use my PBD often, but I'm very glad I have it when I have to.
For woodwork it's perfect, but some people think the run-out is a bit much for any precision metalwork. You can improve it by replacing the chuck with one of the Rohm Supra-s chucks (SUPRA-S Quick-action Drill Chucks |...
Unfortunately there are no pictures of their products.
Their main site lists 9 different areas they produce products for, the 'Industrial' section shows 15 subsections, and the 'Cutting fluid' area lists 11 different types of cutting/grinding oil! (Yeah, I never realised there was such a massive...
I haven't opened them in a 4 months, I can't remember if they have a smell - I'm off work until next Wednesday, I'll check then.
Definitely not gritty though, and the green is a lot thicker than the blue.
We have a contract with a waste disposal firm who take all our old fluids, as well as the various liquids from the on site automotive teaching centre - getting rid of it isn't a problem, but it'd be a shame to just get rid of it when it could potentially be worth a couple of hundred quid a...
We use a lot of RR, before that the one we used to use was also a white, milky one.
It's been suggested that the green one might be grinding fluid....:dunno:
Six months ago ordered 2 barrels of Exol Excelfluid RR from a supplier.
They arrived, and are labelled as RR, with slightly different batch numbers. When I came to use them, they turned out to look nothing like the fluid we normally use.
I got in touch with the supplier, and sent them the...