Alternate Configuration
The alternate end gear configuration is used when cutting modular or diametral threads. The 57T end gear is positioned on the outside so that it meshes with the 44T transposing gear instead of the 56T gear, as illustrated in Figure 77.
24T |
56T |
44T |
Modular and Diametral |
Pitch Turning |
57T |
Figure 77. Alternate end gear configuration.
Configuring End Gears |
|
Tools Needed | Qty |
Hex Wrench 6mm | 1 |
Wrench 22mm | 1 |
To configure the end gears:
1.DISCONNECT LATHE FROM POWER!
2.remove the headstock end gear cover.
3.remove the cap screw, lock washer, and flat washer from the bottom 57T end gear (see Figure 78).
Pivot
Hex Nut
Cap Screw,
Washers & Spacer
Figure 78. End gear components.
4.loosen the pivot arm hex nut shown in Figure 78, then swing the pivot arm to the left so that 44T/56T gears are away from the 57T gear. Hand tighten the hex nut to keep the arm in place.
5.use a stiff brush and mineral spirits to clean away the debris and grime from the gears and shafts, then lubricate these devices as instructed in the End Gears lubrication sub- section on Page 69.
6.making sure to keep the key seated in the shaft, remove the spacer and the 57T gear, then re-install them as follows:
—For the standard end gear configuration, slide the 57T gear on first, then the spacer on the outside.
—For the alternate end gear configuration, slide the spacer on first, then the gear.
7.re-install the cap screw, lock washer, and flat washer you removed in Step 3 to secure the spacer and 57T gear.
Note: DO NOT overtighten the cap
8.slide the pivot arm back so that either the 44T or the 56T meshes with the 57T gear, then retighten the pivot arm hex nut.
Note: Make sure to keep approximately 0.002" play between the gears.
