ER-16 Headstock and Motor Unit
The 3308 would replace the standard headstock, motor and speed control assembly that come on Sherline machines.
The ER-16 nut that ships with your order may be plain or have a black oxide finish.
ER-16 Spindle Available
Note that the headstock, DC motor and speed control can also be ordered with an ER-16 collet spindle nose in place of the standard Sherline #1 Morse internal taper and 3/4-16 thread on the nose for those who prefer to use ER-16 collets. Sherline does not supply the collets, but they are available through MSC Industrial Supply Co. and other tool suppliers. Keep in mind that if the ER-16 nose is ordered, no Sherline accessories that use a #1 Morse taper or 3/4-16 thread will work on this spindle.
To power, and control the motor a more sophisticated speed control unit is required. This 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 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 speed over the entire range. 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.
This unit can be purchased to replace an existing AC/DC motor on an older Sherline machine, to turn a mill XYZ base into a complete mill so that you don’t have to swap power units back and forth from the lathe, or as a stand-alone unit for custom tooling designs. This very compact and well-engineered unit costs far less than other DC units of similar power offered in major industrial tool supply catalogs.
ER-16 Collet Range Specifications
|.020″ – .393″||.5 mm – 13 mm|
Always wear safety glasses when operating machine tools.
|Headstock spindle bore||.406″|
|Headstock spindle nose internal taper||16° taper|
|Headstock spindle external thread||22 x 1.5 mm|
|Pulley groove side angle||19°|
|Spindle Runout (at spindle nose), Maximum allowable (Most are within .0005″)||0.001″|
|Spindle End Play (adjustable with preload nut), Factory Settings||with 2800 RPM Pulleys: 0.0002″with 10,000 RPM Pulleys: 0.0003″|
|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.|
|Motor and Speed Control||ELECTRIC MOTOR SPECIFICATIONS FROM MANUFACTURER|
|Type of enclosure||Totally enclosed, non-vented|
|Duty rating||Continuous–10 oz. in. at 6100 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. / 6100 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||6100 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|
|30111||ER-16 Headstock Assembly|
|33050||DC Motor & Speed Control Assembly|
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- To view .stp files you need an STP viewer. CLICK HERE to use Autodesk’s FREE A360* online file viewer. STP is a file extension for a 3-D graphic file used by CAD software. STP stands for STandard for the Exchange of Product model data. STP files are used to store 3D image data in an ASCII format, following the standards defined in ISO 10303-21: Clear Text Encoding of the Exchange Structure.
- Each 3D file format has been compressed into a .zip file to save file space. Click on the .zip file link below to download it to your computer.
- Extract the .zip file to the drive location of your choice.
- Open the .igs file using the IGS Viewer, or open the .stp file using the A360 Autodesk online viewer.
*NOTE: There are also other free STP viewers that can be downloaded directly to your computer.