Hardinge SUPER-PRECISION HC - Page 8

Figure 11 - Tool Support and Component s
Figure 12 - Spr ing for Tool Post
CHASING HEAD
CYLINDER HOUSING
Feed Rate Adjusting Screw Removal
NOTE: Feed rate adjusting screw " B '', Figure 13, is
factory set and sealed . Removal is not recommended
unless absolutely necessary .
1. Disconnect air pressure at control unit .
Remove wax sea l from screw "A", Figure 13, and
remove lock screw "A ". Loosen set screw under lock
screw "A" .
2. Unscrew piston stop assembly "B". Remove
roll pin "C", Figure 14 , knob "D", adjusting nut "E"
and O -ring "F". Do not misplace brass plug under
screws " A ", Figure 13 .
6
Fig ur e 13 - Chasing Head Cy l inder Hous i ng
Feed Rate Adjusting Screw Replacement
1. Repl ace O- ring '' F ", Fi gure 14 , adj u st i ng nut
" E ", knob " D" and rol l p in " C ".
2. Thread piston stop assem b ly " B ", Figure 13
into casting unti l ad j ust i ng nut " E ", Fi gure 14 , is
flush with casting. Turn knob " D" down unt il it j ust
contacts nut " E" . Connect air pressure at control
unit.
3. Cycle threadi ng unit. If unit , fails to cycle and
slide to advance , turn large white dia l clockw i se by
hand to stop passes . Thread adjust i ng nut " E" out
gradually per following instructions unt il paw l can
enter ratchet and operate chasing head .
(a) Turn knob "D ", Figure 14 , counter - clock-
wise until adjusting nut " E" moves a frac-
tion of a turn . Tighten set screw under lock
screw "A". Turn kno b " D" down until it
just contacts nut " E ". Cycle thread in g unit.
4. When chasing hea d cycles , tighten set screw
under lock screw "A", Figure 13, and r eplace screw
Slide Travel Adjusting Screw Removal
1. Disconnect air pressure at control unit. Loosen
set screw "G ", Figure 13 . Do not misplace brass plug
under set screw.
2. Remove adjusting screw "H", Figure 15 , and
remove O-ring "J".
Slide Travel Adjusting Screw Replacement
1. Replace O-r ing "J", Figure 15 , and start ad-
justing screw " H" . Connect air pressure at control
unit.
2. Set thread depth control dial at 70. Turn ad-
justing screw "H", Figure 15, slowly to its limit under
normal pressure and back off 1/e turn. Relock set
screw "G", Figure 13 .