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Old 12-06-2005, 03:53 PM
hosana hosana is offline
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Detroit Hardness Tester

Has anyone ever heard of a Detroit Hardness Tester? A friend that works in a machine shop gave one to me. I can't find any info online so maybe someone else can help. It is a tube about a foot long that has a scale on the inside wall of the tube. Inside of the tube is a ball bearing. You place the end of the tube on the surface you would like to test. When the ball is dropped from the highest point in the tube, the ball will bounce in front of the scale. The highest bounce point ( the first bounce) will be the rockwell hardness. We tested it against the real deal, a rockwell tester, and it seems to be somewhat accurate. I have not tested it on my knives yet but plan to. Has anyone else seen or used one of these little tools?
Thanks for sharing.

Mike


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Old 12-06-2005, 04:48 PM
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Dragon cutlery Dragon cutlery is offline
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um the only thing i know that you havent stated is that thay can be goten for around 135.99 and thay are supposed to not damage the steel like the tiny point of a rockwell tester can ide say keep it stedy to keep from afecting the drop and use it to give your self a good idea of your hardness if you have to know spot on you might want to borow the rockwell agen (theres a little bit of human erore in the ball drop and read aproch to testing)


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