Homemade drill press centering jig consisting of a wooden block with a shallow V cut into it. Shorter version is secured in a machinist's vise, while the longer unit is affixed to the drill press table from below via thumbscrews.
This jig will assist in drilling holes in tubing and pipe. It is specifically designed for use in a drill press. The V-block bolts to the table and the angled flats hold the material firmly in place so holes can be drilled without center-punching.