Hardinge SUPER-PRECISION HC - Page 7

NOTE: THREADING UNIT REQUIRES ONLY 10
VOLTS FOR OPERATION. Machines manufactured
after Serial No . 100A are wired to include 10 volt tap
on transformer.
FOR INITIAL SETTING OF AUTOMATIC THREADING
UNIT, SEE OPERATOR'S MANUAL FOR AUTOMATIC
THREADING UNITS ON MODEL HC CHUCKING
MACHINE.
ELECTRIC CONTROL FUNCTIONS
(Figure 6)
L-Fuse for automatic threading unit. (FRN 1-¼)
M-Control voltage transformer (115 volt output
with 10 volt tap for automatic threading unit).
'
l
Figur e 8 - Too l Post Ass e mbly
ii
Fi gure 9 - Fine Adjustment Dial Removal
5
Fi gure 10 - Fine Adjustment Dial Assembly
AUTOMATIC THREADING
UNIT REMOVAL
1. Disconnect electrical power source and
remove wires at terminals 8 and 37, Figure 6.
2. Loosen cable grip at " K" and remove cable
from main switch case.
3. Disconnect air pressure and remove air line
from threading unit at lubro-control unit.
4. Remove four nuts and washers "F " , Figure 4,
and remove complete threading unit with hoist and
sling.
5. If necessary, remove the T-Bolts " D" and " E ",
Figure 3, and base plate " B" , Figure 2.
TOOL POST DISASSEMBLY
1. Remove bolt " A" , Figure 8, washer and tool
block " B".
2. Loosen nuts " C" and ·'D'', Figure 8, and slide
tool post assembly down keyway to remove .
3. Unscrew fine adjustment dial assembly, Figure ·
9.
NOTE: FINE ADJUSTMENT SCREW HAS LEFT-
HAND THREADS.
4. To disassemble fine adjustment dial assembly:
(a) Remove taper pin " E ", Figure 10, and
unscrew dial " F".
(b) Remove adjusting bolt ·'G ", nut " H" ' and T-
Bolt " J" .
5. Remove nut "K", Figure 11 , washer and spring
" L", Figure 12. Remove T-Bolt "M ", Figure 11.
6. Unscrew adjusting nut " N" . Figure 11, from
tool post support " O' '.
7. Reassemble. NOTE: Fine adjustment dial as-
sembly which has left-hand threads , can be threaded
into either one of two threaded holes, depending on
set up.