Bridgeport Hardinge 1 Series Owner's manual

INSTALLATION, OPERATION,
MAINTENANCE, AND PARTS LIST
SERIES I
MILLING MACHINES
Revised: August 29, 2005
Manual No. M-450 Litho in U.S.A.
Part No. M -0009500-0450 June, 2003
TP5260

CHAPTER 3 - MAINTENANCE
2J-HEAD
MAINTENANCE PROCEDURES
Motor Removal
1. Run head to adjust to lowest speed.
2. Disconnect power.
3. Remove three screws “A” and cover “B”, Fig-
ure 3.1.
4. Using the two screws “A”, compress spring
“C”.
5. Rotate the speed changer to the highest
speed.
6. Remove the reversing switch from the belt
housing.
7. Remove the two securing screws “D”.
8. Lift the motor and rest the case on stud “E”,
Figure 3.2.
9. Ease the belt over the lower drive disc and
remove the motor.
M-450 3-1
Figure 3.1 - Motor Removal
Front View
D
TP5320
C
A
B
Figure 3.2 - Motor Removal
Side View
TP5321
E

Drive Belt Replacement
1. Remove the motor as described on Page
3-1.
2. Remove the three screws “F”, Figure 3.3,
insert into the adjacent tapped holes and
withdraw bearing housing “G”.
3. Remove the two screws and the bushings
“H”.
4. Remove four screws “I” and one screw
“J”.
5. Remove four screws securing speed
changer “K”.
6. Remove top housing “L”. Tap to clear the
dowels.
7. Replace the belt.
Timing Belt Replacement
1. Remove the motor.
2. Lower the quill to full extent.
3. Remove the two lower cap screws “M”,
Figure 3.4, from the speed changer hous-
ing.
4. Remove the four cap screws “N”.
5. Remove the top assembly “O”, and tap to
clear dowels
6. Replace the belt.
3-2 M-450
Figure 3.3 - Drive Belt ReplacementTP5322
F
G
I
KHL
J
Figure 3.4 - Timing Belt Replacement
N
TP5323
MO

Brake Shoe Replacement
1. Remove the top section.
2. Remove the two screws “P”, Figure 3.5.
3. Remove the clutch hub assembly “Q”.
4. Replace the brake shoes “R”.
5. Remove the bearing, drive discs and
circlips from the hub assembly “Q”.
6. Replace the bearing and housing “S”.
7. Thread hub “B” through the bearing and
reassemble the discs, etc.
M-450 3-3
Figure 3.5 - Brake Shoe Replacement
TP5324
Q
S
R
P

HEAD
MAINTENANCE PROCEDURES
Micro Feed Trip Assembly and Quill Re-
moval
1. Remove screw “A” and ball reverse lever
“B”, Figure 3.6.
2. Remove retaining ring “C”, screw “D” and
arm “E”.
3. Thread shaft “F” through micro nuts and re-
move.
4. Remove screw “G” and stop “H”.
5. Remove quill.
6. Clean all areas, oil liberally and reassem-
ble.
7. Check correct operation of micro feed trip
assembly together with feed trip linkage as
per feed tripping adjustment (see Figure
3.8).
3-4 M-450
Figure 3.6 - Micro Feed Trip Assembly and
Quill Removal
TP5325
G
H
B
A
F
C
E
D

Balance Spring Replacement
1. With quill in maximum up position apply quill
lock.
2. Remove screw “I”, hub “J”, and key “K”, Fig-
ure 3.7.
3. Remove screws “L”, allowing housing to ro-
tate slowly releasing spring tension.
4. Lift end of spring from pin on the pinion
shaft.
5. Rotate housing “M” counter-clockwise from
head casting.
6. Remove spring from housing and replace.
7. Refit spring to main housing casting. Turn
housing clockwise until spring locates on pin
in pinion shaft.
Feed Trip Adjustment
1. Release locknut “N”, Figure 3.8.
2. Engage trip handle lever “P”.
3. Adjust micro nuts against quill stop “O”.
4. Slowly turn adjusting screw “Q” until lever “P”
trips. If set to light will not be able to drill.
5. At this point secure locknut “N”.
6. Check for quick action response.
M-450 3-5
Figure 3.7 - Balance Spring Replacement
J
I
K
M
TP5326
1-1/2
Turns
L
Figure 3.8 - Feed Trip Adjustment
Engage
O
P
N
Q
TP5327

Collet Aligning Screw Replacement
1. Use felt pen, mark reference line on quill
and nose cap “S”, Figure 3.9.
2. Remove set screw “R”.
3. Unscrew nose cap “S”.
4. Remove lock screw “T” and collet aligning
screw “U”.
5. Replace “U”; insert collet and check that
the dog on the end of the screw does not
interfere with the bottom of the guide slot.
6. Replace lock screw “T”.
7. Replace nose cap “S”; check felt pen
markings for correct alignment.
8. Replace set screw “R”. CAUTION - DO
NO OVERTIGHTEN as this will cause
distortion.
9. Check gap “V” (.003”, .08mm)
- CAUTION -
Do not attempt to remove nose
cap before removing set screw
“R”. Doing so will cause serious
damage.
3-6 M-450
Figure 3.9 - Collet Aligning Screw
Replacement
TP5328
UT
R
S
U
T
V

GIB STRIP ADJUSTMENT
MAINTENANCE PROCEDURES
Adjustment of Table Gib
The table is provided with a full length tapered gib
in the saddle, and an adjusting screw on the left side
(see Figure 3.10). To take up gib, tighten gib
adjusting screw slightly and repeat until a slight drag
is felt when moving the table by hand.
Adjustment of Saddle and Knee Gibs
A tapered gib is used for adjusting the saddle
bearing on the knee. This forms a guide for the
saddle. To tighten gib, the same principle as
described above is used; however, the chip wiper
has to be removed first (see Figure 3.11).
M-450 3-7
Figure 3.10 - Table Gib Adjustment
Table Gib
Screw
Saddle
Clamp
TP5329
Figure 3.11 - Saddle and Knee Gibs
Adjustment
Saddle Gib
Adjusting Screw TP5330
Chip Wiper
Guard
Backing Felt

Adjustment of Knee Gib
Remove chip wiper and adjust screw until
smooth movement is attained (see Figure
3.12).
- NOTE -
Loose gibs will cause loss of
machine accuracy.
3-8 M-450
Figure 3.12 - Knee Gib Adjustment
Saddle Gib
Adjusting Screw
TP5331
Chip Wiper
Guard
Backing Felt

TABLE SCREW
MAINTENANCE PROCEDURES
Backlash Adjustment
1. Crank the table to the lift.
2. Withdraw “W”, Figure 3.13, half a turn.
3. Tighten screw “X” while slowly turning handle “Y” until minimum backlash is obtained over
entire travel.
4. Finally, lock screw “W” on to “X”.
5. Used only with old style nuts not new split nuts.
6. Backlash is set approximately ,003” - .005” on new machines.
7. Backlash is set at .003” to .005” max.
- NOTE -
Older machines do not contain split nuts.
M-450 3-9
Figure 3.13 - Backlash Adjustment
TP5332
X
W
Y