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Steel ruler


trebor
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Well said, that man. I once worked with a car designer who could look at a clay model and spot if it was out one side to the other, by as little as half a millimetre. "yeah sure", we scoffed and measured the model again on a Stiefelmayer measuring machine (accurate to 1/100th of a mil.) and he was spot on! The eye is astonishingly accurate.

BTW, to be pedantic it's a steel rule. A ruler runs a country.

Martin

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It's difficult to tell if it's streight in the shop as its in a plastic sheath with a cable tie round the top so you can't slide it out. So far it's seems ok, a bit on the flexable side though but still better than what I had before. My other was hinged in the middle which made it stand off surfaces over 30cm and it made using cutting blades tricky.

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Simplest way to check the straightness of a rule or straightedge is to place it on a flat surface, a piece of white contiboard is ideal and using a sharp pencil draw a line along the edge(s).Then flip the rule/straightedge over and align the same edge with the pencil line at the ends of the rule/straightedge. Now draw a second line. It should coincide exactly with the first line, if not it's not straight.

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