Sherline Lathe User Guide and Specifications

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