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A very SMALL box lot...

D

Dave H (MI)

Well-known Member
Like maybe 4 square. Had two small 90 degree squares, a clamp, and this thing was in the bottom unnoticed. The clamp has no marks but the rest are Starrett. I only vaguely have an idea of what this is for, maybe someone can help me out. I photographed the thing with the number on the bottom so cannot look it up as I left it out at the shop. Pretty sure it has to do with lathe threading, how I dunno.


cvphoto109198.jpg
 
They are called a fishtail.

They are used for grinding high speed steel toolbits to the correct angle for thread cutting. Also used to set the tool square to the workpiece.
 
Fishtail is machinist jargon for what the bookmakers and textbooks call a center gage (it's worth noting that the letter u is commonly omitted from the word gauge in machine-shop parlance.)
 
Somehow I don't think that is the whole story. There are two different scales running up the sides and a whole lot of small print up at the pointed end. I think there may be different scales on the reverse. Why is there a pointed end BTW? I've seen the YouTube videos showing the grinding of the tool and the lining up with the work.
 
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