I finished resanding the pieces sent to me by "busted knuckles" and retested them. The results came out pretty close to the same as before, but I think I can see why. After sanding to 800 I can see shadows in the steel, like a cloud or hamon. I don't know how it happened but I drew a line around the "cloud"and then tested inside and outside the cloud and here are the results. This is for #6 on your list busted knuckles which was the piece quenched in parks 50 and not tempered---- inside the cloud=39.5,43.7,& 32.6 HRC. Outside the cloud=65.75,64.9, & 64 HRC. The rest of the results are as follows---
1.quenched at 1500 in dt48 & drawn at 350 FOR 1 hr=HRC 62.7, 63.5, 63.5
2.quenched at 1500 in dt48 & drawn at 350 FOR 1 hr=HRC 61, 62, 63, 63.25
3.quenched at 1500 in dt48 & not drawn =HRC 67.5,67.5,67.5
4.quenched at 1500 in p50 & drawn at 350 FOR 1 hr=HRC 63.1,63,63
5.quenched at 1500 in p50 & drawn at 350 FOR 1 hr=HRC 62.9,62.75,62.1,61.9
6.quenched at 1500 in p50 & not drawn =HRC 39.5,32.6,43.7,64,64.9,65.75
Just so you know i also tested my machine ,before and after doing your plates, with the test plate that came with it which is HRC 61.7 and my results were always 62 HRC. so pretty close.
Any if you would like to retest some more plates I'd be happy to test them for you again. If you'd like I can send these back to you or try to get some pictures if that would help,just let me know.
Larry