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(02-22-2015, 06:05 PM)EdK Wrote: Willie,

What are those Starrett key seat clamps used for, other than seating keys?  
I don't know what a key seat clamp is, obviously.

Ed

For holding a scale or a rule parallel to the length of a piece of round stock Ed. You can use them for holding a rule steady against a shaft for measuring or laying out a keyway. Also good for transferring a locating mark on the end of shaft (a centerline for example) down the length of the O.D. You could also use a small piece of angle iron and do the same thing, but these along with a 6 inch scale fit much more nicely into a shirt pocket.