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| silver steel hardaning |
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| andyf:
If you mean a chart for colours when tempering silver steel after it has been hardened, Wong, here's one: http://www.alexdenouden.nl/08/temper.htm . I'm a bit mystified by the difference between boring bars and boring tools, but it's very hard to tell the 5° C colour differences anywhere between 220° and 250°C. I think the best practice is to hold the item at the required temperature for some time. My kitchen oven goes up to 280C, so suppose I could use that. I would need an oven thermometer; the oven thermostat and dial are not accurate, which is the excuse I use for my culinary failures. However, in most cases I just play a flame below (rather than directly on) the item, away from the crucial parts like points and cutting edges, and watch the colours run along until those parts have reached something like the required shade, then remove the flame and allow to cool. Using a flame means that I can't hold the correct colour for more than a second or two, but it really doesn't seem to matter too much on small items. Bedding the item in sand in an old tin which is heated from beneath gives more control, with slower colour changes. I do this on the gas hob in the kitchen. In fact, I do quite a bit of metalwork in the kitchen. Even when my wife was alive, she was very tolerant, being an engineer's daughter. Andy |
| Lew_Merrick_PE:
Andy -- Oven thermometers are very slow reading. http://www.harborfreight.com/ac-dc-digital-multimeter-37772.html is a reasonably inexpensive multimeter with thermocouple (TC) port that will read directly up to 1000°C (order a couple of spare TC's when you order the beastie to save what's left of your mind when one gets munged). There are easily built up TC reading systems floating around the instrumentation geek websites (sorry, I don't have a link at hand) such that you can accurately read temps up to 3000°C with a $2 (10 for $20) TC. I have (if anybody's interested) diagrams and schematics for a home-built optical pyrometer (mostly used in a forge). Back in my college days I was the physics lab machinist. One of the people there thought it would be "fun" to activate a 5W neon-argon laser whilst I was collumating the lens set. As a result I am dead colorblind to red -- which makes judging hot things "by color" a bit of a challenge. Hence my "fascination" with non-color systems. If you go to http://www.mcmaster.com/# and search for 88645KAC, you will get more information on tool steel (silver steel) than you ever wanted to know (unless you are a crazy design engineer). |
| krv3000:
HI all thanks i had a blond moment its for me next project |
| PekkaNF:
--- Quote from: Lew_Merrick_PE on May 23, 2012, 11:46:58 AM ---.... Back in my college days I was the physics lab machinist. One of the people there thought it would be "fun" to activate a 5W neon-argon laser whilst I was collumating the lens set. As a result I am dead colorblind to red -- which makes judging hot things "by color" a bit of a challenge. Hence my "fascination" with non-color systems. --- End quote --- What color you drew on that bastard? PekkaNF |
| Pete.:
--- Quote from: wongster on May 23, 2012, 08:59:36 AM ---Anyone has a colour chart of sort? I only get orange the last time I tried. Regards, Wong --- End quote --- For carrots or for hardening? |
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