Just one thing to remember about tools.
If you use High Speed Steel (HSS) tools they are much more tolerant of heat than carbon steel tools and you will not loose the temper if they run at less than red heat. So, the warnings about running grinders cool and slow do not apply to HSS tools. The temper on a really hard carbon steel is drawn if the steel exceeds 215 degrees centigrade (420 deg F, gas mark 7). The steel will not be softened if the temperature does not get up to its tempering temperature, it will be softened only if it's exceeded.
There is a down side to HSS tools though. They do not seem to hold an edge in quite the same way as a good carbon steel. For the absolute
best work possible carbon steel tools are an imperative. For lesser work, you take your pick.
For info, the list below (of tempering temperatures, steel colours and uses) is drawn from Marv Klotz's web site (
http://www.myvirtualnetwork.com/mklotz/ ) with editing and Gas Mark temperatures added by me - because I try to temper my tools in the kitchen oven if possible (ie when Tracy's out of the house!).
Tempering Colour: FAINT YELLOW; 420 degF; Gas Mark 7; Use: KNIVES,HAMMERS
Tempering Colour: VERY PALE YELLOW; 430 degF; Use: REAMERS
Tempering Colour: LIGHT YELLOW; 440 degF; Use: LATHE TOOLS, SCRAPERS, MILLING CUTTERS, REAMERS
Tempering Colour: PALE STRAW YELLOW; 450 degF; Gas Mark 8; Use: TWIST DRILLS FOR HARD USE
Tempering Colour: STRAW YELLOW; 460 degF; Gas Mark 9; Use: DIES, PUNCHES, BITS, REAMERS
Tempering Colour: DEEP STRAW YELLOW; 470 degF;
Tempering Colour: DARK YELLOW; 480 degF; Use: TWIST DRILLS, LARGE TAPS
485 degF; Use: KNURLS
Tempering Colour: YELLOW BROWN; 490 degF;
Tempering Colour: BROWN YELLOW; 500 degF; Use: AXES, WOOD CHISELS, DRIFTS, TAPS >= 1/2", NUT TAPS, DIES
Tempering Colour: SPOTTED RED BROWN; 510 degF;
Tempering Colour: BROWN PURPLE; 520 degF; Use: TAPS <= 1/4"
Tempering Colour: LIGHT PURPLE; 530 degF;
Tempering Colour: FULL PURPLE; 540 degF; Use: COLD CHISELS, CENTER PUNCHES
Tempering Colour: DARK PURPLE; 550 degF;
Tempering Colour: FULL BLUE; 560 degF; Use: SCREWDRIVERS, SPRINGS, GEARS
Tempering Colour: DARK BLUE; 570 degF;
Tempering Colour: MEDIUM BLUE; 600 degF; Use: SCRAPERS, SPOKESHAVES
Regards
Richard