I don't think they would be needed if I used a production quality vise, this is a second. I only torqued the lead screw to 37% of max and I am sure it had backed off some because my spacer tube was crushed by the load. I normally don't intentionally create so much cutter forces when machining parts like I did for this test. If I was setting this up to make parts my machining strategy would be a lot different. To be honest, I thought the vise wouldn't be as stable as it was due to how I mounted it.
Impressive! Have you thought about using some "serra jaws" for even more rigidity?
I don't think they would be needed if I used a production quality vise, this is a second. I only torqued the lead screw to 37% of max and I am sure it had backed off some because my spacer tube was crushed by the load. I normally don't intentionally create so much cutter forces when machining parts like I did for this test. If I was setting this up to make parts my machining strategy would be a lot different. To be honest, I thought the vise wouldn't be as stable as it was due to how I mounted it.