Sherline Mill and Lathe Specifications

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.