I'll throw out some thoughts.....
What about a tap holder set?, some set have large ones.
There are also collets made to hold reamers that have a square drive recess.
I've got a couple in MT2 or MT3.
Or even find an old 12-point socket set from the days of square head bolts.....those would mount on a 1/4", 3/8" or 1/2" square drive and could be driven from a cordless drill by a hex to square drive.
I'll see if I can dig up some photos or links.....
-brino
EDIT: some links......
https://littlemachineshop.com/products/product_view.php?ProductID=3602&category=
https://littlemachineshop.com/products/product_view.php?ProductID=5966&category=
https://www.kbctools.ca/CatSearch/121/split-sleeve-tap-drivers
What about a tap holder set?, some set have large ones.
There are also collets made to hold reamers that have a square drive recess.
I've got a couple in MT2 or MT3.
Or even find an old 12-point socket set from the days of square head bolts.....those would mount on a 1/4", 3/8" or 1/2" square drive and could be driven from a cordless drill by a hex to square drive.
I'll see if I can dig up some photos or links.....
-brino
EDIT: some links......
https://littlemachineshop.com/products/product_view.php?ProductID=3602&category=
https://littlemachineshop.com/products/product_view.php?ProductID=5966&category=
https://www.kbctools.ca/CatSearch/121/split-sleeve-tap-drivers
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