Criterion 3F-HB Boring/Facing Head - $500 (Sequim)

This is an unused Boring/Facing Head that has been on the shelf for 30 years or so. I had another one that I used and never had occasion to put this one into service. It listed for over $2500 so save yourself some money and pick this one up instead.

(The following is the description from the Criterion site.)

The 3F-HB is the ideal tool for performing those difficult facing, grooving, backfacing and counterboring operations on work pieces too large to turn or too bulky to handle safely.

This head is designed to incorporate a reversing feature. The head can be used in either the forward mode (moving from the inside to the outside) or in the reversing mode (from the outside to the inside). This reversing function is accomplished by reversing the spindle.

The 3F-HB features a gear drive mechanism that generates a continuous feed rate. To prevent damage to the gear train, a specially designed detent clutch automatically disengages when a pre-set stop is reached or when cutting pressures become excessive.

Automatic feed is in the forward or reverse mode and is actuated by holding a knurled feed-ring. To return to starting position, a hex wrench is inserted in the end of the micrometer screw and manually reversed.

A 1-1/2-18 threaded back permits the use of any 1-1/2-18 threaded shank or adapter.

Specifications:


1. TOOL NO. : 3F-HB
2. THREADED BACK : 1-1/2-18
3. BODY DIA. : 3"
4. HEIGHT : 3-7/8"
5. OFFSET OR TRAVEL : 13/16"
6. BORING BAR HOLE SIZE : 3/4"
7. CENTER DISTANCE BETWEEN HOLES : 15/16"
8. CROSS HOLE DIAMETER : 3/4"