Modifying a 4-jaw chuck mounting

[Frank S]

The 6" 4-jaw chuck had a type A2-5 short taper mounting, but I needed it to fit an adapter I had made to the back of the 5" 3 jaw chuck I have.
TO do this all I needed to do was to make a 0.125" deep bore 3.875" in diameter into the back of the 4-jaw chuck then drill and thread the adapter to accept the mounting bolts.

bore completed

the adapter is a tap on fit

Drilling the adapter

Completed

[DIYer]

Thanks Frank S! We've added your Chuck Mount Modification to our Machining category,
as well as to your builder page: Frank S's Homemade Tools. Your receipt:

Chuck Mount Modification by Frank S

tags: chuck, mount

[Toolmaker51]

Few realize handy aspect of temporarily mounting a small chuck in a larger machine, especially an independent 4 jaw.