This double rotary table setup by Bob Breslauer of Ft. Lauderdale, Florida,
is an example of the type of special setups Sherline tool owners sometimes develop.

Standard Dimensions of Sherline Tools

If you are making special tooling or a custom accessory for your Sherline tools, this will save you the trouble of measuring your particular machine to find a dimension, some of which are actually quite difficult to measure. If you need a dimension not listed here, please call or write with your request.

Most of the regular specifications can be found by looking at the Lathe and Mill descriptive pages which have a Specifications List at the end of each.

LOCATION

DIMENSION

Bed dovetail angle

55.5 degrees*

Lathe bed to spindle centerline

1.75"

Lathe table surface to spindle centerline (calculated)

.940"

Headstock spindle nose internal taper

#1 Morse

Lathe tailstock internal taper

#0 Morse

Headstock spindle external thread

3/4-16

Pulley groove side angle

19

Table T-slot centerline distance (lathe and mill) 1.5"
T-slot nominal dimensions**

**Note: The T-slots are extruded into the material. Table surfaces are machined for flatness, but the slots themselves require no additional finishing processes.

Slot width, top: .25" 
T width, bottom: .40"
Upper slot depth: .10"
T Slot depth: .10"
(Total depth: .20")
Leadscrew thread pitch, inch

(Lathe, mill X and Y axes = 1/4-20, Mill Z axis = 3/8-20)

20 threads per inch or .050" travel per revolution (handwheels divided into 50 increments of .001")
Leadscrew thread pitch, metric

(Lathe, mill X and Y axes = 6.3 x 1 mm, Mill Z  = 10 x 1 mm)

1 mm travel per revolution (handwheels divided into 100 increments of .01mm)
Leadscrew thread directions Right-hand: Lathe crosslide, Mill X-axis

Left-hand: Lathe leadscrew and tailstock screw, Mill Y-axis and Z-axis

*NOTE: This dimension was determined by measuring the extruded bases that were supplied when we first took over production in the USA from the former Australian manufacturer. The base and several other parts were cast to match this angle and it was not economically feasible at the time to change it to an easier-to-manufacture 60 degrees. The original 55-degree angle was determined by a reference to Machinery's Handbook, Vol. 17 as the ideal angle to cut a dovetail. When we took over production, a fixture was produced in-house to duplicate the existing angle which had changed slightly from the original 55 to an actual 55.5. This fixture became the "standard", and every machine built since the early 1970's has been measured against this same fixture. The older brass beds and the current steel beds as well as the parts that fit them are all ground to this same angle.

ALLOWABLE TOLERANCES

Spindle Runout (at spindle nose), Maximum allowable (Most are within .0002-.0003") 0.0005"
Spindle End Play (adjustable with preload nut), Factory Settings with 2800 RPM Pulleys: 0.0002"

with 10,000 RPM Pulleys: 0.0003"

Self-Centering 3-jaw and 4-jaw chuck runout 0.003" or less
Leadscrew thread pitch accuracy 0.001" per inch of travel

COLLETS

Sherline WW Collet body diameter 0.312" to 0.313"
8 mm WW collets (by others), body diameter 0.314" to 0.315"
WW and 8 mm collet thread .275-40

HEADSTOCK BEARINGS

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.

HISTORICAL NOTE

You might find it interesting to note that a problem similar to the one mentioned above is probably why Morse tapers are not perfectly consistent to this day. A Morse taper is listed as "about 5/8" per foot". Standard fixtures were probably made years ago and machines and tools over the years were made to match these fixtures. Modern measurement techniques were able to establish that these fixtures were not all perfectly consistent in angle. Changing the angle, however, would make it impossible for new parts to fit the old machines. Therefore, today we have Morse tapers that each vary slightly from a taper of 5/8" (.6250") per foot. The actual tapers for each number Morse taper are as follows: 

MORSE TAPER # TAPER PER FT. TAPER PER IN.
0 .62460 .05205
1 .59858 .04988
2 .59941 .04995
3 .60235 .05019
4 .62326 .05193
5 .63151 .05262
6 .62565 .05213
7 .62400 .05200

More on dimensions...what is a Micron?

While we are talking dimensions and tolerances, you may find that some people, most often in the scientific community, speak in microns. A micron is defined as a millionth of a meter or a thousandth of a millimeter (.001 mm). The inch equivalent of this would be .00003937" which is usually rounded off to .00004" or a little less than a half of one ten-thousandth of an inch. This means there are about 25 microns in .001", or 100 microns would be about .004" (or more exactly 0.003937").

Sherline Tool Dimensions

John Costello has done some AutoCad drawings that show the basic overall dimensions of our lathes and mills. Click on the links below to view dimensioned drawings of each machine:

4000/4100 Lathe

4400/4410 Lathe

5000/5100 Mill

5400/5410 Mill

2000/2010 Mill

8400/8410 CNC Lathe

8440/8441 CNC Lathe

8540/8541 CNC Mill

8020/8021 CNC Mill

3700 Manual Rotary Table

8730 CNC Rotary Table

Lathe Cross-section

The drawing below shows the key dimensions on a Sherline Model 4000 lathe. It is provided to help those who wish to make special equipment to fit to your lathe. If you wish to download a higher quality version of the drawing, it is also available using the link below. Note that the longer 4400-series version of the lathe has a taller cast base for more rigidity. It is 0.33" taller overall and 9" longer.

CLICK HERE to view a larger .JPG image of the drawing below.

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: 90 VDC 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: 17 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

MOTOR TORQUE CURVE

NOTE: Electronic circuitry built into the speed control supplies a constant 90 VDC output to the motor regardless of the input current from 100VAC to 240VAC, 50 or 60 Hz, so Sherline machines can be plugged in and used in any country in the world without a transformer as long as you have the correct wall plug converter..

USE WITH AN INVERTER: This motor and speed control can be used with an inverter that produces a sine wave. It cannot be used with an inverter that produces a square wave.

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