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For Machines Mfg. Since 7/09 EVS Toolroom Lathes
-47-
OPERATION
Alternate Position
When the 44- and 57-tooth end gears are meshed
(see Figure 87), you can perform modular and
diametral pitch turning.
End Gear Setup
The gearbox drive gear on this lathe can be
configured for the "normal position" or the
"alternate position" (both described in following
paragraphs), depending upon the type of
operation to be performed. The lathe is shipped
with the end gears in the normal position. Gears
must be thoroughly cleaned and re-coated in
grease before installing (refer to Page 61), and
the backlash must be maintained at 0.005" for
correct meshing.
Normal Position
The 24T end gear is installed in the top position,
the 44T/56T end gears in the middle position,
and the 57T end gear in the bottom position, as
shown in Figure 86. In the normal position, the
56T and 57T gears are meshed, which allows for
inch and metric threading and all general feed
operations.
57T
56T
24T
Inch and Metric Pitch
Threading
Inch and Metric Feeding
Figure 86. Normal end gear position.
44T
56T
24T
57T
57T
56T
44T
24T
Modular and Diametral
Pitch Turning
Figure 87. Alternate end gear position.
Configuring End Gears
1. DISCONNECT LATHE FROM POWER!
2. Move the gearbox range lever to "Low" so
that the gears will not rotate in the following
steps, then open the lathe headstock side
cover.
3. To change the position of the 57T gear:
a. Remove the cap screw and flat washer
that secures the gear, then remove the
gear (see Figure 88).
Figure 88. Removing the end gear.
Cap Screw and
Washer
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