Rotary blade markings -- what is this?
 

Today while changing the blade in my Olfa rotary cutter I noticed something I hadn't paid attention to before. On one side of the blade, around the edge, there are numbers from 1 to 12 with a line between each number. What is the purpose of these?
And yeah, while changing the blade, though ever so carefully, I sliced my finger! OUCH!

Good question. The answer is here.

:thumbup:Thank you, dunster. Although, it doesn't show how a rotary blade would cut only in one area at a time at
https://olfa.nl/en/history and https://www.olfa.co.jp/en/birth_of_olfa_cutter.html The Chenille cutter evidently has 24 areas to be used per https://olfacutters.co.uk/Olfa-CHN-1...-Fabric-Cutter

Janey - Neat people never make the exciting discoveries I do.
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Ah HAH! Thank you, dunster!

I have a chenille cutter that uses a rotary blade, but only uses one spot at a time so when the spot gets dull, you rotate the blade to the next spot. think of it was a large seam ripper with a rotary blade edge exposed right where the cutting happens. There are carpet cutters out there that work the same way.