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+--- Thread: related to Rockewll Hardness study (/showthread.php?tid=279)
related to Rockewll Hardness study - Ken S - 02-16-2018
I would like to share some observations inspired by the Rockwell Hardness topic, but not directly on topic. I have no desire to hijack the original topic.
EOU quite correctly referred to the metrically challenged US. While this is true, our excuses are wearing very thin. Each conversion between systems introduces an error factor. This seems preventable.
Mark referenced using rulers. There are several substantial differences between rulers (also called rules). In my opinion, the pick of the litter are the Starrett satin chrome rules. Unlike less expensive photoetched rules, Starrett rules have marks which are engine cut. The marks are V shaped, which allows for greater accuracy. Satin chrome finish makes them easy to read in bright or dim light. They are available in many graduations, the most common being "4R" (1/8, 1/16, 1/32, and1/64”) Of course, they are also available in metric. There are none better (and they are priced sccordingly, although they will last a lifetime)
Each time a high quality rule is used the chance of error is lessened.
Ken
RE: related to Rockewll Hardness study - Mark Reich - 02-19-2018
You are absolutely correct, Mr. Ken! I've been using Starrett rules for well over 30 years. I recognized the difference the first time I tried one, and have never looked back. I have a bunch of them by now, and I've yet to see competition.
It's hard to find rules down to 64ths, and much harder to find one you can read easily, unless of course, it happens to be a Starrett. It's like putting corrective lenses on old timer's eyes.