3 Jaw Drill Chuck 1/4 Inch

thingiverse

This tool is based on an old patent drawing for a Jacobs chuck. It can securely hold bits up to one-quarter of an inch in diameter. When building the chuck, you must insert the jaws in the proper sequence. The parts feature dot symbols to guide you through the assembly process correctly. The chuck includes a tapered socket designed for press-fitting onto a shaft. A standard one-quarter inch hex screwdriver socket should fit snugly on the included shaft.