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How to Use a Toolmaker's Vise

Guide · Updated October 28, 2026

A toolmaker's vise is a small, ground-square vise for precision work on a surface grinder, surface plate or drill press. All faces are square and parallel, so you can turn it on its side or end to grind or check features at 90°.

Check the vise

Check vise squareness with gage blocks and an indicator. The free Gage Block Calculator builds the stack.

Step by step

Clean: Wipe vise, part and magnet.
Check squareness: Check sides square to the base with a square and indicator.
Clamp the part: Clamp lightly against the fixed jaw.
Seat the part: Tap the part down onto a parallel.
Mount: Set on a magnetic chuck or plate.
Grind or check: Grind or measure the first face.
Roll 90°: Turn the vise on its side for the next face.

Worked squareness check

Stand the vise on its side on the surface plate. Sweep the vise base face vertically over 2.000 in with a test indicator. A reading change of 0.0002 in means 0.0002 ÷ 2 = 0.0001 in per inch out of square. Note it and compensate, or have the vise reground.

Small parts

Use parallels so the part sits above the jaws for grinding.

Avoid lift

Tighten moderately and tap down; overtightening lifts the part.

Worked example: grinding a block square on all six faces

Grind face A flat on the magnet. Clamp A against the fixed jaw, grind face B. Turn the vise on its side (its sides are square to the base) and grind face C, then roll again for D. Check each new face with a square and indicator: over a 1.500 in face, a 0.0003 in reading change is 0.0003 ÷ 1.5 = 0.0002 in per inch. If the error repeats on every part, it is the vise; note which side and grind or shim to compensate. Finish the ends with the part standing on end against the fixed jaw, checked with a square.

Checking the vise itself

Clamp a ground parallel and sweep its top with the vise on its base, then on each side. Any change shows jaw or body error. Recheck after a drop or crash.

Using it for drilling and inspection

On a drill press it holds small parts square to the spindle. On the surface plate it lets you check features at 90° with a height gage without re-clamping.

Common problems

Not square: dirt or burrs. Part shifts: uneven clamping. Magnet lets go: small contact area.

Tips

Square: check squareness.
Parallels: parallels.
Grinder: surface grinder.

Worked example: clamping force and part shift

A 0.500 in thick part held only 0.150 in deep in the jaws has little grip, and grinding sparks may push it. Raise it on a ground parallel so at least half its thickness, here 0.250 in, sits in the jaws, and tap it down with a soft mallet until the parallel will not slide. If the part tips when you tighten, put a short piece of round stock between the moving jaw and the part so the force is a line contact and the part is pushed square against the fixed jaw.

FAQ

What is a toolmaker's vise?

A small, ground-square precision vise.

Can I turn it on its side?

Yes, all faces are square.

How do I check squareness?

Sweep a side with an indicator.

How tight?

Moderate, then tap down.

What is it used on?

Surface grinders, plates and drill presses.

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