Accommodates larger stock with a 9/16″ through-hole
Offers Class 3 and Class 5 bearing options for varied needs
Features optional DC motor for smooth, quiet operation
Adapts globally with versatile AC/DC voltage compatibility
Adjusts speeds from 70 to 2,800 RPM with control knob
The Sherline 9/16" Through-Hole Spindle Headstock is engineered to accommodate larger stock by featuring a maximum through-hole diameter of 9/16 inches (14.28 mm). This design modification, however, results in the elimination of the #1 Morse internal taper, thereby restricting the use of tapered tools such as drill chucks and fly cutters. Nonetheless, threaded tools, including 3 or 4-jaw chucks and end mill holders, remain compatible with this headstock. The headstock is equipped with a spindle pulley and a precision ground head key, ensuring reliable performance.
The headstock is available with two classes of bearings: Class 3 and Class 5. Class 3 bearings have been a standard choice, offering dependable service over the years. In contrast, Class 5 bearings, although more costly, provide enhanced smoothness, quietness, and cooler operation, making them particularly suitable for industrial applications. The Class 5 headstocks incorporate two 20 mm, lifetime-lubricated ball bearings with an adjustable preload nut, factory-set to .0002 inches (.005 mm) of endplay. This configuration is ideal for extended operations at speeds up to 4000 RPM, with the option to adjust the preload for higher speeds up to 10,000 RPM.
An optional DC motor with a sophisticated speed control unit can be integrated with the headstock. This motor delivers maximum torque at low RPM, which is crucial for machining tasks, and operates more smoothly and quietly compared to an AC/DC motor of similar or larger size. The speed control unit is versatile, accepting AC currents ranging from 100 VAC to 240 VAC, 50 or 60 Hz, and converting it to 90V DC for the motor, allowing for global usage without the need for a transformer. The speed can be adjusted using a control knob, with a range of 70 to 2,800 RPM in the normal pulley position, and a reduced maximum speed in the high torque position, enhancing torque at any given speed.
1x Sherline 9/16" Through-Hole Spindle Headstock
1x 10-32 X 3/8″ Set Screw
1x Headstock Casing
1x 9/16″ Preload Nut
1x 9/16″ Headstock Spindle
1x Precision Ground Head Key
1x Bearing Washer (SS)
1x 10-32 X 5/8″ Skt Hd Cap Screw
1x Headstock Class 3 Bearing
1x Headstock Class 5 Bearing
1x #2 X 1/4″ Pan Hd Sheet Metal Screw
1x 10-32 X 3/16 Cup Pt Set Screw
1x 5/16-18 X 3/4″ Cone Point Set Screw
1x 9/16″ Headstock Spindle Pulley
1x Motor Bracket
1x Drive Belt
1x DC Speed Control Assembly w/Belt Guard
1x Stepped Motor Pulley
1x Hill House DC Motor (2020)
Spindle through-hole: 9/16″ (14.28 mm)
Spindle external thread: 3/4 x 16
Pulley groove side angle: 19°
Maximum allowable spindle runout at spindle nose: 0.001″
Spindle end play adjustable with preload nut, factory settings: 0.0002″
Headstock bearings: 6004ZZ
Bearing bore size: 20 mm (0.7874″)
Bearing bore tolerance: 0.0004″
Bearing outside diameter: 42 mm (1.6535″)
Bearing outside diameter tolerance: 0.0005″
Bearing width: 12 mm (0.4724″)
Bearings: 9 balls, 1/4″ diameter
Motor and speed control: Electric motor specifications from manufacturer
Two-speed pulley RPM range: Normal belt position=70-2,800, high-torque, low RPM position=70-1,280
Type of enclosure: Totally enclosed, non-vented
Duty rating: Continuous–10 oz. in. at 6,100 RPM, 0.85 amperes; Intermittent–30 oz. in. at 5,500 RPM, 1.75 amperes (5 minutes on / 15 minutes off)
Output horsepower: 0.06 KW (60 W) at 10 oz. in. / 6,100 RPM
AC voltage (input): Normally 115 VAC, 60 Hz, single phase to rectifier
DC voltage: 90V DC to motor (60 Hz)
Speed in RPM: 6,100 RPM continuous
Class of insulation: Class A, 105° C insulation system
Normal full load current: 0.85 amperes
Starting current: 1.7 amperes instantaneous starting current (<100 milliamperes)
Type of motor: 3.00 inch (outer diameter) sub-fractional horsepower brush-type permanent magnet motor
Temperature rise at ambient 50° C: Less than or equal to 45° C
