This boring head is based (with permission) on a design by the late George Thomas.
The generously proportioned dovetail and dowelled gib, coupled with a large diameter graduated dial, make for precise and silky smooth adjustments. With this boring head, plus simple shop-made cutters (3/8"ø shanks (and, via adaptor sleeves, smaller ones as well), you can machine washer seats, cut counterbores for socket head cap screws down to 0-80, bore holes for which you don’t have a drill of the right size, and bore/counterbore holes in jobs too big to swing in your lathe.
You can use it in your vertical mill, and/or in the 3-jaw chuck in your lathe.
This is a valuable and versatile milling machine accessory that will serve you for a lifetime. I suspect you’ll learn a few things in the course of making it, too. The instructions are very detailed, and the drawings show every part, complete with dimensions for making the Boring Head in 2 different sizes, to suit both larger and smaller mills.
US Customers: US$10.50 ppd
Canadian Customers: (includes postage and applicable taxes)
$10.50 AB SK, MB, QC, YT, NT, NU
$11.30 NB, NL, ON
$11.50 NS, PE
Customers outside US or Canada: C$13 ppd