Clamping Outside the Jaws and Other Jaw Tricks We may either machine the step ourselves (in the case of soft jaws) or purchase jaws with a step already machined. We set the workpiece high in the jaws typically either by using a set of Vise Parallels or because we have jaws installed in the vise that have a step machined fairly high on the jaw. This is done both to provide access to the workpiece and because it provides more repeatability the less of the workpiece is gripped–there’s just less area for a trip or other irregularity to influence what’s going on. Most of the time we’ll want to sit the workpiece fairly high in the jaws. Having the vise properly installed and trammed, the next question is proper use. How to Tram a Vise on a Mill Vise Parallels and Jaw Steps Learning to tram (or “square”) a Machinist Vise is one of those basic skills every machinist must learn early on. Tramming a vise is the procedure of using an indicator to sweep a vise jaw (you want the fixed jaw, not the movable jaw) so you can adjust the vise position until the sweep shows the vise jaw is parallel to the axis as it moves. If you have a T-Slot table you’re mounting the vise to, you’ll probably want to tram the vise as well. You don’t want to trap a chip between the vise or table. Clean the Table and Tram the Machinist Viseīefore putting any vise on your machine table, be sure to clean the table of chips. It operates smoothly, repeatable, and with a wedge mechanism that pulls the movable jaw down onto the bed so the part is not lifted due to deflection as the jaws are tightened.ĭon’t scrimp on your machinist vises because they’re the Workholding Solution you’ll use most often. What Makes a Good Machinist Vise?Ī good Machinist Vise is well made, typically of cast iron. A Machinist Vise (also called a Milling Vise) is probably the most popular workholding solution available for milling machines.
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