Hardinge SUPER-PRECISION HC - Page 19

2. To replace guide bar and knockout piston:
(a) Replace 0-ring "P", Figure 60 .
(b) Replace guide bar, "J", Figure 58, and
replace pin "H". Adjustment of two screws
"G " will be made after knockout assembly
is replaced on machine.
(c) Replace piston shaft "F", Figure 58 . Line
up dowel pin "Q", Figure 60, with locating
hole in piston .
(d) Replace 0-ring "O", Figure 59, in seal
" N" . Replace 0-ring and seal on piston
ring "M" and replace piston ring "M".
NOTE: Use nut "C ", Figure 55, to start
these parts in cylinder wall liner.
(e) Replace 0-ring "L", Fi gure 59, piston plate
"K" and nut "E", Figure 57.
(f) Replace spring "D", Figure 56, and nut
"C", Figure 55.
(g) Replace adjusting collar " B". Replace
brass plug and set screw "A". Adjustment
of collar "B " will be made after knockout
assembly is replaced on machine .
3. To replace micro switch mount " X ", Figure 52:
(a) Replace trip rod "D", Figure 54, in mount
while replacing springs " J", three re-
taining rings and cam "H". Tighten set
screw "G ".
(b) Replace mount and four screws "B", Fig-
ure 53 .
(c) Replace stop collars "Z" and "A", Figure
52, two brass plugs and two screws "Y".
Adjustment of stop collars will be made
after knockout ass e mbly is re placed on
machine.
4. To re place micro switche s:
(a) Replac e micro switches " G" a nd "H ", Fig-
ure 50, two screws, wa shers and nuts " W",
Figure 52. Mount micro switches as shown
Figur e 52. Clearance in mounting holes
will a llow mi c ro sw itc hes to be se t so that
mov eme nt of trip rod in e ith er direction
will trip the intended switch and both will
be released at rest position .
(b) Re plac e red wire from air valve on "nor -
mally ope n" te rmin al of micro s wit ch " H"
Fig ure 50 . Re pl ace red jump er wir e o~
" common " terminal of switch "H".
F igur e 55 - Cover Nut s f or Pistons
17
Figure 56 - Spring for Knockout Piston
5. To replace air valve:
(a) Replace air valve and three screws " F ",
Figure 50 . NOTE: Spring "A", Figure 66,
must be in hole "B". Adjust i ng screws "C"
control air exhaust rate and are set in
"open" position. Turn screws "C" coun-
terclockwise to limit.
(b) Replace elbow " V", Figure 50, nipple "U " ,
coupling "T" and exhaust silencer " S".
(c) Replace nipple "R", spring "Q " , washer
"P", felt "O" and coupling " N" .
(d) Replace red wire on terminal " M ", Figure
51 .
6. Replace two 0 - rings " K" , Figure 50.
7. Replace final screw " F" and white wire from
main switch cas e. Replace black wire from same
cable and red jumpe r wire on " common " terminal of
micro switch " G" .
8. Replace wire from chasing head on terminal
screw "J " of a ir valve . Replace wire from same cable
on " normally open " terminal of switch " G" .
9. Replace valve housing over two dowel pins
"E" , Figure 49, and replace four screws " D".
10 . Pull slack from e lectric cables out of housing
and tighten cable grips " A" and "B ", Figure 48.
11. Replace air line connector " C" .
12. Turn di sconnect switch on main control case to
"On".
13. To adjust stop collar "A", Figure 52 :
(a) Raise automatic threading unit and push
the threading attachment toward head-
s to ck. Plac e %
2
" shim at " A" , Figure 67,
a nd lower thr ea ding unit in to op e rating
position . Pull cycle start knob .
(b) Turn coll ar slowly into trip fork until click
is heard from solenoid in air valve. Tighten
lock screw in collar to maintain setting and
re move shim . Connect air line at control
unit.
14. Adjust guid e bar " J" , Figure 58 , stop collar
"Z" , Figure 52, or adjusting collar " B" , Figure 55, per
instructions in " Operator's Manual for Automatic
Thr ea ding Units on Model HC Chucking Machines"
und er " P ara ll e lism " , " Thread Length Adjustment "
and " Threading Tool Re traction " respectively.