Sherline 3C Collet Spindle Headstocks
Select your bearing and motor options for pricing.
Includes 1″ spindle wrench and spindle bar (chuck arbor and collet not included, shown for reference only)
About Sherline’s 3C Collet Spindle Headstock
Our 3C Collet Headstock came from customers’ requests. Many customers asked for a spindle and collet to allow larger diameter stock to go through the headstock. With the 3C collet, our customers can now hold stock up to 1/2″ diameter that will pass through the headstock.
The 3C Collet Headstock is interchangeable with our standard headstock. The centerline height is the same, and the mounting system is the same. Therefore you can easily switch from our other headstocks to the 3C headstock.
The 3C Spindle is electroless nickel plated to aid in rust prevention and increase the spindle’s surface hardness for durability. The headstock includes a spindle pulley and a precision ground head key.
If you wish to use a chuck with the 3C headstock, you can purchase the 3C to ¾-16 chuck arbor. All of our 3- and 4-jaw chucks with a ¾-16 thread will fit on this arbor.
When it comes to making the 3C collets, we can’t compete with the cheap import collets, and companies like Hardinge already make quality 3C collets in many sizes. Therefore, we leave it up to you to decide from whom you want to buy your collets.
3C Collet Range Specifications
|.070″ – .542″||1 mm – 13 mm|
NOTE: Hardinge also offers custom sizes and both hex and square sizes.
NOTE: Certain attachments, like the Thread Cutting Attachment, the Lathe Power Feed, and the 10,000 RPM Pulley Set, will NOT work with the 3C Collet Headstock. If you are uncertain if an accessory will work with the 3C Collet Headstock, please contact us for more information.
- Class 3 or Class 5 Bearings
- With or without a DC Motor and Speed Control Unit
NOTE: The 3C collet spindle has standard electroless nickel plating. There is NO option for a plain finish.
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 2800 RPM. In the “high torque” position, the maximum speed is cut in half, but torque at any given speed is much greater.
Always wear safety glasses when operating machine tools.
|Headstock spindle nose||3C collet, 1/2″ Through-hole|
|Pulley groove side angle||19°|
|Coating||Electroless Nickel (uniform coating thickness up to .004″)|
|TIR (total indicator runout) at spindle nose||0.001″ (Better runouts may be attained upon request)|
|Spindle End Play (adjustable with preload nut), Factory Settings||0.0002″|
|Designation/stock number (ZZ refers to “double shielded”)||6004ZZ|
|Size of bore||20 mm (0.7874″)|
|Tolerance of bore||0.0004″|
|Outside Diameter||42 mm (1.6535″)|
|Tolerance of OD||0.0005″|
|Width||12 mm (0.4724″)|
|Bearings||9 balls, 1/4″ Dia.|
DC Motor & Speed Control Specifications
|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, .85 amperes; Intermittent–30 oz. in. at 5500 RPM, 1.75 amperes (5 minutes on / 15 minutes off)|
|Output horsepower||.06 KW (60 W) at 10 oz. in. / 6,100 RPM|
|AC voltage (input)||Normally 115 VAC, 60 Hz, Single Phase to rectifier (Sherline electronic speed control converts any input from 100 VAC to 240 VAC, 50-60 Hz.)|
|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||.85 amperes|
|Starting current||1.7 amperes instantaneous starting current (<100 milliamperes). This is also stall current in True RMS|
|Max current at time of changeover from lower speed to higher speed||Depends on load|
|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|
Headstock Bearing Replacement
We don’t recommend that customers replace the headstock bearings. We use custom fixtures to align the spindle and the bearings. You must return your headstock to our facility for bearing replacement*. Contact our customer service department, firstname.lastname@example.org, for an RMA number before sending your headstock back for service.
*NOTE: Fees apply
Click the links below to learn more about the specialized fixtures and procedures for setting the headstock bearing preload.
PDF: Replacing Headstock Bearings
Video: Setting the Headstock Bearing Preload
|40105||3C Headstock Case||1|
|40580||Spindle “Tommy” Bar||1|
|40233||3C Headstock Spindle||1|
|43233||3C Main Spindle Pulley||1|
|40163||3C Preload Nut||1|
|40430*||3C Headstock Class 3 Bearings (*P/Ns 30113 and 3310 only)||2|
|40403*||3C Headstock Class 5 Bearings (*P/Ns 30104 and 3315 only)||2|
|40260||Precision Ground Head Key||1|
|30117||3C Collet Draw Bar||1|
|30118||3C Collet Draw Bar Knob||1|
|30123||3C Headstock Spindle Bearing “Washer”||1|
|30124||3C Drawbar Thrust Washer “Inner” .126″||1|
|30125||3C Drawbar Thrust “Needle Bearing”||1|
|30126||3C Drawbar Thrust Washer “Outer” .032″||1|
|40540||5/16-18 X 3/4″ Cone Point Set Screw||2|
|30127||3C Spindle Key Way Set Screw||1|
|30128||3C Spindle “End Cap”||1|
|37160||Rotary Table Preload Nut||1|
|43234||3C 1″ Multi-Wrench||1|
|40520||10-32 x 3/16″ Cup Point Set Screw||1|
|30129||5-40 x 1/8″ Cup Point Set Screw||1|
|40580||Spindle “Tommy” Bar||1|
Motor Parts* (*P/Ns 3310 and 3315 only)
|43000||DC Speed Control Assembly w/Belt Guard||1|
|43360||Stepped Motor Pulley||1|
|45475||Hill House DC Motor (2020)||1|
Click the P/Ns below to download a zipped version of the IGS 3D CAD files. You will need to extract the zip file before viewing the IGS file.
30113 3C Collet Headstock 3D IGS Model
30113 3C Collet Headstock + 3C to 3/4-16 Chuck Arbor 3D IGS Model (Arbor shown for reference only. Not included.)
30113 3C Collet Headstock + 3C to 3/4-16 Chuck Arbor + 1040 3.1″ 3-Jaw Chuck 3D IGS Model (Arbor and chuck shown for reference only. Not included.)
You need an IGS viewer to view .igs files. CLICK HERE to download a FREE IGS viewer.