Yost MV-5 Multi-vise
Technical

Get More Out of Your Vise with These Special Jaws

The one piece of equipment no workshop should ever be without is a bench vise. A vise adds not only a measure of safety, but also versatility. In fact, a good vise is like having an extra pair of hands, especially when you’re working alone. But this ubiquitous chunk of iron or steel can be made even handier when it’s a co-called multi-vise.

Unlike most vises that are designed with specific tasks in mind, a multi-vise is meant to be adaptable to many functions. One way a multi-vise accomplishes this is with a unique set of jaws, as on this Yost MV-5 unit. Rather than having knurled or grooved jaw faces, the MV-5’s are smooth to prevent marring delicate materials, for instance. But its real superpower comes from the four “jaw dogs” that go in the top of the jaws. Here’s how to put these (accented below in yellow for clarity) and its other unique features to work for you.

Insider tip: if you already own a Yost 445 vise, you can upgrade it with the MV-5 jaw kit for the best of both worlds.

Expand work capacity

By inserting the four jaw dogs into the holes in the tops of the jaws, the vise goes from a 2.9-inch opening to more than 7 inches. The expanded capacity is great for holding wider pieces of stock, such as this piece of 2” x 8” lumber.

Yost MV-5 Multi-vise
Jaw capacity more than doubles with jaw dogs (yellow) in place

Clamp irregular shapes

Not everything you’ll need to put in your vise is uniformly shaped. The transmission housing, for instance, has numerous bosses and contours (in addition to being rather large). The four free-spinning jaw dogs center on the part to hold it place more securely than two parallel jaws would.

Yost MV-5 Multi-vise
This odd shape would be virtually impossible to hold in a standard vise

Secure round objects

Holding round work in a typical vise means there are only two points of contact. Depending on how you apply force, such as drilling, the work may spin in the vise without excessive clamping. In this case, the four jaw dogs create a four-point plain to keep the piece level while working. Less force is required to clamp, preventing damage as well.

Yost MV-5 Multi-vise
Large pipe held securely by all four jaw dogs

Clamp from inside out

Sometimes there’s just no way to put a piece in a vise. It’s either too large or doesn’t have a surface that can be clamped. In the case of this motorcycle wheel, we positioned the pins of the jaw dogs in the center bore and opened the vise to clamp it outward. It’s an unusual way to use a vise, but could be just the right solution for sanding or polishing. And it wouldn’t be possible in a standard vise.

Yost MV-5 Multi-vise
From underneath, you can see how the dogs expand to clamp the center of the motorcycle wheel

Bend metal stock

With two jaw dogs inserted in the center holes, they serve as leverage points for small bending jobs. And sure, you can certainly make single bends in the jaws of a traditional vise. But this arrangement allows for continuous, multi-radius, and multi-directional bends.

Yost MV-5 Multi-vise
Multiple bends are possible on the top of the jaws

Hold work vertically

The problem with clamping round pieces upright in most vises is they want to spin once you start working. The vertical V-channels in the vise faces are optimized to hold round stock and hardware between ½” and 2” in diameter perfectly upright.

Yost MV-5 Multi-vise
This 3/4″ tubing is secured upright for work

Hold work horizontally

The same problem as above holds true for holding round material horizontally. A pair of horizontal V-channels does the same job in the perpendicular orientation. This is especially helpful when drilling into round stock.

 

 

Yost MV-5 Multi-vise
Horizontal V-channels run the full width of the jaws to hold work securely

3 Comments

  1. You pay for the shipping anywhere you purchase. It’s embedded it the existing price.

  2. Vincent annechiarico

    Definitely needs free shipping. I want to order a small items and the shipping was a lot of money so I didn’t.

  3. Eastwood needs free shipping.