Lathe dog

The workpiece passes through an aperture in the dog into which the work is secured by one or more setscrews or a clamp arrangement.

[2] Bent tail dogs are able to engage directly with a driving faceplate slot or a chuck jaw but can crowd work off centre if clearance is not present between the dog tail and a closed end of the faceplate slot.

[3] Straight tail dogs do not present the issue of crowding work off centre but require at least one driving stud to be mounted on the faceplate.

If the rotating mass of the dog setup is not balanced, eccentric motion of the work may occur.

Use of headless setscrews, preferably of multiple-spline drive design, that do not protrude above the outer surface of the dog is recommended.