02-16-2018, 07:27 PM
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
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