I have made some "v-groove" linear guides out of 3/16" cold rolled steel which will be used with the v-grooved Bishop Wisecarver type bearings. I am preparing to drill holes along the rails so they can be mounted to the side of 80/20 aluminum extrusion. I have a drill press and a drill press vise.
1. The rails will be held off the extrusion just a little with short standoffs so that the wheels can clear. How far apart would you recommend the holes/bolts be?
2. I will be using a 1/4" bit and to get them aligned as accurately as possible, should I mark the holes with a center punch before drilling? Or what would you suggest?
Thanks!