1/2" & 5/8" Pencil Hole-Center Marking tools

thingiverse

I needed to mark the centers of some holes to transfer a metal part onto a tag-board drawing. Doing this on metal or wood typically means using center punches. Those aren't ideal for paper, and I didn't even have one for 5/8" holes, so I 3D printed the solution. These simple models are just cylinders with the outside diameter the size of the hole I need to mark - in this case 1/2" & 5/8". The hole down the center of the cylinder is the size of a pencil. These "Pencil Center Punches" are one inch tall - just enough to hold the pencil firmly and mark the hole.