locating pin for drilling a linear series of holes

[Frank S]

With the las picture it looks like you are setting the hole center by eye.

Still it is a good project.

Ralph

There were a couple holes that drifted off center a bit. Actually I shouldn't be using 1/2" studs on T nuts that fit in a .560 slot. Should be using 7/16" studs or use only T bolts. I could mill the slots out to be standard with the rest of my machines but the mill is fairly old and has an unmolested table