Greetings,
A friend and I are building a heat treating oven for his knife making hobby and my general home machine shop. He wants to be able to test the hardness of his knife before and after heat treating (C50-C55 range) and I am interested in being able to test metal in general (anneal, machine, reharden to Cxx various sized items that may surface to be worked on) so we are looking at buying some kind of harness tester. I see lots of larger Wilson and similar models on ebay but there are many different models (3JR, 1JS,
3JS, 5JR, 12A, and huge variations on prices. Most come with weights and some come with diamond and different sized ball indenters, which I assume are all changeable for A/B/C scales. I haven't run one of these machines before, and while the idea of various weights vs. various sizes of penetrators makes sense, I'm assuming the plug in cord and remarks of motors may be to raise and lower the penetrator gently onto/into the test surface.I also see some smaller portable models, but I have no idea on whether they would work well enough to be worth buying.
My question is this: does anyone have any comments on specific makes/models which would do what we want, or anything I should be looking for (or looking out for) when buying a used tester? Thanks.
Al MacDonald