The drill chuck is probably the most important accessory you will need for your lathe. It will enable you to accurately centerline drill, ream, or tap any part mounted on the lathe. The part to be machined is chuck or collet mounted in the headstock.
The tool is mounted in the tailstock chuck and fed into the part using the tailstock ram feed. Parts that are going to be mounted between centers can be center drilled this way. Other parts requiring a hole accurately drilled on center on center can also e machined this way. These chucks can also be mounted in the headstock of the lathe. The drill Chuck P/N 1069 is 1/32" to 3/8" (9.5mm) a drawbolt and two arbors are included. A #0 Morse arbor fits the tailstock and a #1 Morse arbor fits the headstock. Chuck to arbor thread size is 3/8" x 24 tpi.
Allowable chuck runout as specified by Jacobs is .004" or less
1069 Sherline 3/8 in Tailstock Chuck & Key Instructions
CA Prop 65 WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use dust mask or other safeguards for personal protection.
I can do all this through him who gives me strength. Philippians 4:13