Have you seen this vise model before?

[mklotz]

Very nice machining work but I'm a bit concerned about the method of locking the three jaws to the base plate. If the pressure screw is strong-armed, will the jaws move? Even a few thousandths of movement would matter in precision machining operations.

If the pressure screw were longer than the 'fixed' jaw and the plate through which the screw is threaded could be permanently affixed to the base. Of course, this would make it look much more like a conventional machinist's vise. Perhaps it would help if you explained why you designed your vise the way you did.

There are a couple of modifications you could make to improve the utility of your design...

Put steps in the two jaws that grip the work so thin stock could be held near the top of the jaws without the need to use parallels.

Put elevated steps on the outboard ends of both the gripping jaws so stock larger than the current jaw opening could be accommodated.

Space the hold down screws in the base so the vise can be mounted parallel to the T-slots as well as perpendicular as shown in the video.

Add a spinner to the tightening screw so the pusher can be snugged up with the fingers before tightening with the Allen wrench. Alternatively, use a hex head screw so a small box wrench can be used.