I made this very simple milling/drill stop 20 years ago, as I was shocked at the price of commercially made ones, which also looked a bit awkward to use. I wanted something quick and simple to set. Also not only restricted to a machine vice but usable with the dividing head, indexing head, angle plate, vee blocks etc. on both the mill and drilling machines.
I use this daily and is one of the most useful tools I have ever made for the mill/drill. If I was to make another, I think it would take me longer to find the suitable materials around the workshop than to produce the stop.
Dimensions are not critical and the stop is, made from stock steel sizes. For cosmetic appearance, after cutting I machined all cut ends square except the main round upright which I radius . The rest of the build is just drilling, tapping, threading, and bending the two operating handles.
Thank you for viewing
The Home Engineer