Using the 4 Jaw Chuck as a Vise

Sherline’s 4 jaw chuck was designed to fit on the lathe spindle, but can also be used on the vertical mill. This is very handy; when I make end plates for raised pillar reels I frequently move the work between mill and lathe, and I don’t have to re-chuck.
IMG_3471

To fit the chuck on the mill’s rotary table, Sherline sells an adapter. It has 3/4-16 threads to fit the chuck, a 7/16 pilot for the table, and 3/8-16 threads to lock down into the table.
IMG_3474

But this adapter is not sufficient by itself. Because of the direction of mill spindle rotation, contact of the work with an end mill tends to unscrew the chuck from the table. This invariably ruins the work, and possibly tools as well.
IMG_3473
What is needed is a clamp to prevent rotation of the chuck relative to the table. Standard Sherline hold-down clamps do not fit. This is my homemade clamp; you can see it assembled in the top photo. The dog on the brass part hangs over the edge of the table, helping orient the clamp.

Advertisements
This entry was posted in End Plate, Fixtures, Work Holding. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s