I’ve used post vices and I’ve used regular vices secured to a pipe and anchored in the shop floor and a vice mounted to a sturdy bench with a 6X6 directly underneath that’s secured to the floor... what makes the post vice superior to the other two as long as there sold and don’t move around?
post vices are expensive...
I’m leaning toward the  oil pipe sunk into the concrete floor with a flange that’s welded to the top to bolt a heavy duty vice to... 

This is my new larger bench vice that replaced a well used smaller 4 inch vice.
the bench is reinforced butcher block with 2x4s glued and screwed underneath and 1x4 steel tube bolted with carriage bolts that are attached to a steel frame and finally bolted to the garages timbers.
then directly underneath the vice a 16 gage timber  U bracket is bolted to the bench/vice and a 4x4 underneath that’s anchor bolted to the slab.

FYI: I live in earth quake county so I like to over build and bolt everything down...

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The way the jaws are mounted to a post vise transfers the force into the leg and down to the floor whereas a bench vise the jaw is mounted at a ninety degree angle so the horizontal piece with the teeth that the jaw is mounted to takes all the force in a shearing direction and Will eventually crack. Hope this makes sense. In simpler terms a post vise directs the energy to the floor while a bench vise takes the brunt of the energy on the arm that the moveable jaw is mounted to.
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One more plus for a post vice. Because of the spring, it only takes one hand(operation) to open and close the jaws. Thus you have a free hand to hold your hot iron. A machnist vice wont automatically open when you losen the screw.

A drawback is you dont have parallel closier between the jaws when it clamps your work, only when they close on themselves.
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One other advantage of a post vice, when you tighten down on something it doesn't move.  I noticed that the first time I used one.

Rule #10;  "I can make that" translates to; "I'm to cheap to buy it new."

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Mike Westbrook
Exactly what everyone said the way the jaw pivots it can clamp much tighter they are smooth jaws so they won't mess up your work and the way the rear jaw transfers force to the ground it's like pounding on a rail track stood on end they are worth it in my opinion 
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Yes, what you all said, but the most important one is the material they are made of.
A parallel vice is cast, a post vice is forged. 
You can forge on a post vice all day long and it will take any pounding you want to deliver to it. 

I can guarantee to smash a machinist vice by forging on it in less than 10 minutes. 

Not all bench vice are the same though. I rescued a Peter Wright bench vice from under a bench half sunken in the dirt, and mounted it on a tripod. Had to make some parts that had rusted away, and cleaned it of hours.
The thing is 5' wide, all forged and the base is bolted together with 5/8 bolts all around. The sliding mechanism is designed to take all vertical forces from hammer blows, and when it does not match the strength of a post vice where all vertical forces go in the leg, it is 10 times stronger than any modern cast vice. 
The tripod is 5"x3"x1/4" and the base plate is 9/16". The counterweights are exercise weights to give it more stability. The way it is mounted i can drag it around and take it to the job within reason, since all up it is more than 100 kg


Much that passes as idealism, is disguised hatred or disguised love of power. Bertrand Russell
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That’s a great vice and stand!
thanks for all the great information.
does anyone make new post vices? I’ve searched and only see used ones...that are $200 and up. 6C10A7BD-5AD9-43F8-9241-BEFC14B8EEBB.jpeg 
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if there is anyone left making post vice, it would be either china or eastern europe. 
Here is one that is most likely made in China. 
I guess that poland, russia, ukraine, bulgaria are countries that are likely to have small factories that make them. But i don't really know for sure. There are way more post vice in the market than there are anvils. 
The reason if I had to take a stab at it, is that bladesmithing can get away with using a cast iron bench vice.
Much that passes as idealism, is disguised hatred or disguised love of power. Bertrand Russell
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