Sherline 9/16″ Through-Hole Spindle Headstock

Description

• Sherline 9/16″ Through-Hole Spindle Headstock
• 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.

View moreWhat’s Included

• 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)

Multimedia

docReady(function() {$(‘button[aria-controls=unique-tab-5]’).one(‘click’,function() {$(“#iframe-video-1”).html(‘‘);})});Specifications

• 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: Continuous10 oz. in. at 6,100 RPM, 0.85 amperes; Intermittent30 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
• Motor frame size: 3 inches
• End use of motor: Drive unit for lathe or mill