Spot Facing and Chamfering

A lot of components in the industry have counter bores or spot faces on the front as well as the back surfaces of a component. Most companies use different setups to machine the two surface. Some companies make a special tool which requires interpolation and is thus inefficient. Our specialized plunge type tools allow you to create counter bores and spot face on the front and back surfaces in no time.

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Features of the Autofacer

What sets the Autofacer apart from other back spot-facing tools?

The Autofacer is an ingenious automatic back counterboring tool that allows a machinist to reach through a hole and machine a circular feature* on the back side of the part automatically. This is accomplished by folding the cutting blade into the shaft of the tool body allowing the tool to pass into the part. Once the tool has entered the part, the cutting blade is mechanically opened and cutting may begin.

Obtuz is the OEM of the Autofacer since 1968 and we continue to be the world leader in automatic back spotfacing and back counter boring tools.

* Circular features might include a spot face, counterbore, countersink, chamfer, spherical radius, or some combination thereof.

Activation Methods

Cone Activated

Flywheel Activated

Torque Bar

Extended Range

Air or Coolant

Pad or Ring

Bearing Guided

KA Series

Cone Activated

Flywheel Activated

Torque Bar

Extended Range

Air or Coolant

Pad or Ring

Bearing Guided

KA Series

Cone Activated

Flywheel Activated

Torque Bar

Extended Range

Air or Coolant

Pad or Ring

Bearing Guided

KA Series

How it Works

Cone grips the face of the workpiece to open and close the blade (must be a machined surface)

Advantages

Reliable performance on any machine tool, CNC or manual
Cost-effective alternative to high-production tooling

How it Works

Utilizes the inertia generated during rapid spindle acceleration to open and close the blade

Advantages

Ideal for modern CNC machines with rapid acceleration and deceleration
Cost-effective alternative to high-production tooling

How it Works

Utilizes an anti-rotation device during spindle reversal to open and close the blade
A Torque Bar Driver or an Arrestor-rod is required

Advantages

Perfect for high-production runs that require the maximum degree of reliability
Ideal for transfer lines and CNC machines

How it Works

A rack and pinion gear opens the blade like a jack knife
Available in Torque Bar and Coolant activated configurations

Advantages

Extended spotface-to-hole size ratio (largest in the industry)
Perfect for internal machining in differential gear cases

How it Works

High-pressure coolant drives the blade open
Spring-pressure closes the blade when the coolant is shut off

Advantages

Simple to set up and run
Perfect for high-production runs
Ideal for machines with high-pressure, filtered coolant systems

How it Works

Pads grip the inside diameter of the pilot hole to open and close the blade

Advantages

Ideal for hole sizes greater than 2.25 inches where front (& back) spotfacing is required

How it Works

A tapered pilot locates on a process bore supporting the tool a full 360 degrees
Adjustable insert cartridge
Available in Torque Bar activated configurations

Advantages

Excellent size control and repeatability
Capable of holding high-precision tolerances of .0001″ (.0025mm)

Specialized Autofacers for Machining Seat Pockets and Clearance Bores on Subsea Gate Valves

The Obtuz KA Autofacer is a modular semi-standard front and back counterboring system that was designed for machining seat pockets and clearance bores in Gate Valves
The KA Autofacer utilizes expandable bushings and modular dampeners to support the tool when cutting which eliminates the need to hold a tight diameter tolerance on your flow bore
Our modular connection allows lengths to be built out in 6” and 12” increments.
The KA Autofacer can be used on standard CNC machine tools- No “W” axis is required.

Spot Facing and Chamfering