Is there an actual name for this?

Mr.Green said:

Trying to determine if this has an actual name/term other than roundy square pin thingy.

Its basically a key, but drops into 3/16" hole in shaft half its length, other half is basically 3/16" square. It engages a simple form of clutch plate on either side of a gear in a power table system, from the 60's.

Not sure what they are called to even look for something? Can't really hold anything that small in my lathe.

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Joe in NH said:

A couple of my 19th century lathes have this convention. Usually found on the ball-cranks or handles.

A groove is made in the handle. Can be cut through but might even be a "miter notch". A cape chisel will cut this quickly. A drilled hole is made in the shaft. A "slug" is made as shown and is put into the hole during assembly and serves the function of a key between the two parts. And usually covered with a washer and nut so you don't see anything.

Not so common after say the turn of the 20th century.

I've often considered this a cheap expedient to actually forming a keyslot in the ball-crank - a form difficult to hold for key-slot cutting in a shaper vise, and difficult to cut the key through by hand or using a "keyseat cutter."

Joe in NH

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Homebrewblob said:

Only thing I can think of is a cross pin bolt for a differential in a truck/car but it’s not the same so who knows

And imo that looks hella janky and sketch but also seems to work

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Mr.Green said:

Friend across the street made me a few today. I need a small lathe with a collet chuck.

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