Sherline 9/16″ Through-Hole Spindle Headstocks

About Sherline’s 9/16″ Through-Hole Spindle Headstock

We opened the spindle through-hole to a maximum of 9/16″ (14.28 mm). While this allows larger stock to pass through the headstock, it also eliminates the #1 Morse internal taper, meaning tapered tools like drill chucks, fly cutters, etc., cannot be held in the headstock. Threaded tools can still be used, such as 3 or 4-jaw chucks and end mill holders. The headstock includes a spindle pulley and a precision ground head key.

NOTE: Certain attachments, like the Thread Cutting Attachment, the Lathe Power Feed, and the 10,000 RPM Pulley Set, will NOT work with the 9/16″ Collet Headstock. If you are uncertain if an accessory will work with the 9/16″ Collet Headstock, please call for more information.

Custom Build Your 9/16″ Through-Hole Spindle Headstock with the Following Options:

• Class 3 or Class 5 Bearings
• With or without a DC Motor and Speed Control Unit

NOTE: The 9/16″ spindles DO NOT have electroless nickel plating as an available option.

Bearing Options

The bearings in the headstocks are offered in two classes: C3 and C5.

The C3 bearings have been standard in all of our headstocks for years and have proven reliable over that time.

The C5 bearing headstocks come at a higher price than the standard C3 bearings headstocks, but they run smoother, quieter, and cooler than our regular class 3 bearing headstocks and are more suitable in an industrial setting.

Sherline’s new C5 headstocks feature two 20 mm, class 5, lifetime-lubricated ball bearings with an adjustable preload nut. The preload is adjusted at the factory to .0002″ (.005 mm) of endplay. The preload adjustment is controlled by the outer races of the bearings being held apart by the headstock case and the inner races being pulled together by the preload nut. This is appropriate for extended running at speeds of 4000 RPM or less. You may need a slightly looser preload setting of .0003″ for operating speeds up to 10,000 RPM.

Optional DC Motor with Speed Control

You can order your headstock with or without our DC motor and speed control unit.

The powerful DC motor offers its maximum torque at low RPM, where you need it most in machining. This means it provides far more useable power than an AC/DC motor of equivalent or larger size. It also offers smoother and quieter operations than an AC/DC motor.

A sophisticated speed control unit powers and controls the motor. The speed control unit accepts any incoming AC current from 100 VAC to 240 VAC, 50 or 60 Hz, and automatically outputs 90V DC to the motor so that this unit can be used anywhere in the world without a transformer. All you need is the correct wall plug or converter. Once the on/off switch is switched to the “ON” position, a speed control knob is used to vary the entire range’s speed. With the pulley in the “normal” position, the speed range is about 70 to 2,800 RPM. In the “high torque” position, the maximum speed is cut in half, but torque at any given speed is much greater.