Thanks a lot for everyone's input. I used MiniTab to compare the data and found there was significant difference between my measurement and heat treating supplier's measurement.
I am going to send standard hardness blocks (RC and R15N) to my heat treating supplier to see if we have the same...
Hi, I am having hardness (both RC and R15N) measurement difference with my heat treating supplier. My measurement is usually 1-2 points higher than my supplier's. We did a hardness correlation study with 15 parts engraved with numbers so that everyone measures the same part. My average is RC...