P/N 3551

Purpose of the Mill Vise

The most convenient way to hold small parts for milling is the Milling Vise. Milling vises are different from other machine vises in that they are designed to hold the movable jaw down while clamping, eliminating any chance for the jaw to lift. A cheap drill press vise is almost useless on a milling machine because you can't accurately align the machine to it.

The Sherline milling vise is sized just right to be the perfect working companion to the Sherline milling machine. The jaws are 1.50" (38.07mm) wide by 1.00" (25.38mm) deep and open a full 2.00" (50.76mm). the fixed jaw has both a horizontal and vertical "V" groove to facilitate holding round bar stock. The vise comes complete with two clamps for use in attaching it to the milling machine. These clamps are the same as the 4-Jaw Hold Down Set (P/N 3058).

NOTE: To keep the surface of your table from being marred, we recommend you take a file and slightly soften or deburr all the edges of the angle clamps that contact the table.

Instructions for Use

The advantages of this vise are obvious when movement of the jaw is studied. (See Figure 1 and look at the bottom of your vice.) The tightening force (F1) produces not only a force against the part (F2), but also a force pulling the jaw downward (F3). Therefore, angle "A" must exceed 45 in order to make force F3 greater than F2. This keeps the movable jaw from "tipping" back. Also note that extreme clamping angles beyond 60 start to apply much downward pressure but not much horizontal force is directed to holding the part. Moving the pull-down barrel to the proper slot keeps the adjustment within the most effective clamping range.

To clamp a part, place the jaw in approximate position and start tightening the adjustment screw at an angle of 45 or greater. (The back face of the moveable jaw is machined at a 45 angle for reference.) If the angle of the adjustment screw gets up to 60 or greater and you still haven't drawn down on the part, loosen up the screw a little and move the pull-down barrel to the next slot and retighten.

Figure 2 shows the proper way to hold a part in the vise. If the part cannot be centered, use a spacer to help keep the jaws parallel. This vise has been designed to accurately hold objects being machined. It is not recommended for use as a bench vise or for clamping parts in such a way and with such force as to adversely affect its accuracy.

NEW! Rotating base now available for the mill vise

The P/N 3570 rotating mill vise base holds the mill vise and allows it to be rotated using an accurate laser engraved angle scale for reference. To read the instructions for the rotating base, click on the underlined name above.

Exploded View and Figures 1 and 2

FIGURE 1-below left, is a cross-section which shows the
pull-down bar located in the center detent of the vise body.

FIGURE 2- above left, shows the right and wrong way to hold a work piece in the vise.

Note regarding angle clamp screws (See part #10 above): It is important to use the correct 5/8" long cap screw in the angle clamps. A shorter screw will not engage enough threads in the T-nut, and a longer screw will damage the bottom of the table T-slots.

Mill Vise Parts List






Vise Body



Movable Jaw



Fixed Jaw Insert



Movable Jaw Insert



Pull-Down Member



Convex Washer



Flat Head Screw, 6-32 x 3/8 (2)



T-Nut, 10-32 (2)



Hold Down Clamp (2)



Skt Hd Cap Screw, 10-32 x 5/8" (4)



Skt Hd Cap Screw, 10-32 x 1-5/8"

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