In article .com,
says...

For many of the older American machines
in the 9" or 10" size, the spindle is going to be MT#3 and the through
hole will be a little larger than 3/4". If you were doing gunsmithing
that wouldn't be acceptable, but unless you are going to be doing axles
for motorcycles you may be able to work within that range.

South Bend heavy 10 gives a 1.375 through hole, takes a 5C collet
in the spindle. This is considerable advantage for working on
old motorcycle parts, believe me.

I think the Logan with that spindle is an 11 or 13 inch swing
machine.

Jim


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