LARGE DIAMETER CHUCK

A simple drill chuck with two applications:
1. Sanding dowels or PVC pipe
2. Self-centering drill jig for ¼” dia holes
Works with stock sizes from 5/8” to 1.5” (actually up to 40mm) diameter

Parts required in addition to the prints:
1. Four M3 x 16 LG button head screws
2. Two ¼” I/D x 3/8” long flanged bush (McMaster Carr 2938T2)
3. One 3/8” x 2.5” long hex head bolt
4. One 3/8” Hex jamb (thin) nut
NOTES:
Assembly: Ensure the jaws are installed in a clockwise direction (1 dot, two dots, three dots) looking at the front.
Install jaws before joining the ring nut. Put a dot of grease on the thread of the M3 screws before installation.
Jaws have no stop to prevent over extension. If they do come out, (by attempting to clamp less than 5/8” dia) they can be re-inserted simultaneously with care.
To clamp the dowel/pipe, hold the three ‘fins’ to prevent the body from rotating while you tighten the ring nut.
Install the bolt and nut for sanding
Install the two bushes for drilling
The two f