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Old 04-27-2015, 04:07 PM
Demo_Eng Demo_Eng is offline
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Breaker Points for knives?

I am trying to find alternative to the standard O1, D2 and other stock tool steel for materials to make the knives. I also work within the demolition industry and have an abundance of used breaker points of all sizes from about 1/2" to 9" diameter, our larger machine has even bigger but they are a bugger to lift let alone try to do anything with.

I know the breaker points must be of a good quality steel, which are hardened to withstand the work to which they are subjected. This leads me to believe there is potential for a source of an alternative material.

It is intended that the points are forged into shape, before being re-hardened and tempered.

I have tried the same with the worn diamond cutting wheels, with various levels of success, but the manufacturers would not provide any indication of the steel or the their treating process other than to say they were high carbon steel for fear of 'other manufacturers copying'.

What is peoples thoughts on this?

I hope you can help in this
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Old 04-27-2015, 06:31 PM
jmccustomknives jmccustomknives is offline
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I got a hold of one of those diamond wheels, it was for sharpening Tungsten. The spark pattern matched some L-6 stock I had. I couldn't get the diamonds of for nothing, even a torch. As far as the breaker points, Idk. I guess they'd need to be big enough to work with, not automotive. lol.

Most of the guys here will tell you to go ahead and buy new stock, that way you take the guess work out of it. I'm of the opinion that if you have enough of it to figure it out it might be worth messing with just for the learning experience.
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Old 09-09-2015, 11:04 PM
electronFarmer electronFarmer is offline
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I used to work in the scrap metal business and came across many of these contact or breaker points. The manufacturers have many different "recipes" for these things, but one of the main alloying elements is Tungsten because of its high melting temperature.
See: https://en.wikipedia.org/wiki/Electrical_contacts
Some have more expensive elemets such as Silver, Nickel or Platinum or (don't get your hopes up) Osmium and Iridium.
These are usually very heavy, that is they have high density measured in grams per cubic centimeter. Yep, its all metric. Water has a density of 1.00 gram per cc and Tungsten has a density of 19.3 grams per cc (nearly identical to gold).
But since these are alloys a density work up will only give a rough indication of what is in there. While I agree with jmccustomknives that if you have an abundance of a material it would be worth anayzing them. But if you got them from different jobs/sites then they will all be different manufacturers, with different recipes.
I don't believe these will make good blades except for just show pieces. They may make fine pommels and handle stack rings and such but not blades. I may be interested in some with sizeable diameter, 3/4 to 1-1/4...
As far as your diamond wheels are concerned, If you heat them high enough, about 725 degrees Centigrade (1335 degrees F) and long enough, then the diamonds will burn into Carbon dioxide or convert to graphite if no Oxygen is present.
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blades, carbon, degrees, diamond, diamonds, electrical, forged, handle, heat, knives, make, material, materials, metal, pattern, pommels, sharpening, show, silver, steel, wheels


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