I needed a hole punch capable of reaching deep into large material for punching center holes in vinyl record blanks. Unfortunately, the longest reach of any hand-activated punch I could find was just 3″. So I built this (admittedly overkill) hole punch.
It uses precision-ground, hardened steel drill bushings and drill rod, making holes that are very precise and tooling that will stand up to a lot of use. Since the bushings are 1/2″ outer diameter, I can easily swap them out to cut a variety of sizes as needed. This design is based on this little set from Micro Mark.
The BOM, in case you’d like to build your own:
|3/4" plywood for base and top die||(varies)|
|Drill bushing – 9/32" ID, 1/2" OD, 3/4" long||9.50||2||http://www.mcmaster.com/#8491a296/=ygximw|
|Drill rod – 9/32" x 4.25"||5.26||1||http://www.mcmaster.com/#3009a129/=ygxisk|
|Steel rod for locating pins – can be any size you have on hand||(varies)||2|
|Rubber feet under base (OPTIONAL)||(varies)||4|