Hi,I speak both from my experience and from info available on the net.This is a universal HSS sharpening machine (on cheap side). It uses a diamond coated wheel. It is long time produced and sold under various brands.So- yes, diamond disks are default for what you ask. It is made for sharpening knives, dril bits, scissors and so on. I have one and used it for both HSS and carbide turning bits.The carbon diffusion is something that really happens: clockworkcheval (and all others) gave the right direction . The reaction happens at high temperature. Low speed and water cooling give the longest life (in industrial environment) . In hobby environment, not-often usage and low pressure guarantees long life.In dental industry, diamond coated disks are since long used and I have used them since long on my Proxxon. Edge cutting wears it rapidly - it is a thin layer; speed is highest, local pressure is high, cooling is low through 0.5 mm -or less- thin metal disk. I cannot say which wears first; diamond or carrier. On the sides, tool life is much longer. Nowadays diamond disks are standard in shaping metals and high hardness materials in all Dremel/Proxxon kits.These are my rough conclusions, but I consider enough for hobby workshop. Off course, refining gives best efficiency.
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I am surprised that good size dressings diamonds can be had at $2.50 on eBay and
under $20 at KBC...
*Are there any old-time grinder hands using these who could give a report?
Are these low-price ones a manufactured-diamond, or a vitrified composite of diamond powder/grits?
I visited the GE diamond lab on 9-mile road in warren mi and those had much the same attributes as real diamonds..but they were not so cheap to produce that you could sell them for 1/10 of the price of a real diamond.
The story back then was that an agreement was made with De Beers about how they would be called and sold.
When I was a kid they could not make margins yellow because it would be phony butter it came in a plastic squeeze container and you had to break an orange food coloring die to make it yellow.
Any not dug-up diamonds should be only called "Manufactured diamonds".
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