Two chucks on a Powermatic standing square chisel mortiser?

wsrhue

wyattspeightrhue
User
I purchased a Powermatic 320 mortising machine from an estate. It has a small Jacobs chuck mounted in the larger chuck. My only guess is that the second chuck shortens the length between the chuck and the clamp that secures the square chisel allowing use of a shorter chisel / drill bit set? Any quesses?
 

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bob vaughan

Bob Vaughan
Senior User
Your assumption is correct.
Slick solution to a modern day problem. Mortising bits used to be long but some of today's chisel/bit combos come with short bits to accomodate the smaller machines.
Nice mortiser, by the way.
 

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