INDIVIDUAL BEARING CLEARANCES
The individual bearing clearances that exist between
the crankshaft and main bearing bushings; crankshaft
and connection bushing; and the connection screw and
slide ball box add up to the total bearing clearance.
The “Individual Bearing Clearance Chart,” shown
below, lists the nominal bearing clearances for the
major bearing assemblies in Model 101 OBI/OBS
Series presses. It may be used as guide in determining
whether looseness or excessive wear has taken place
in a particular bearing location. Please note that actual
clearances may vary slightly (even on new presses)
due to the accumulation of part tolerances and the
geometry of assembled parts.
Replace any single bushing that has excessive clear-
ance, because this looseness will increase rapidly.
Determine the cause of excessive clearance and take
corrective action.
TO CHECK INDIVIDUAL
BEARING CLEARANCES:
EQUIPMENT REQUIRED:
• Base Mounted Dial Indicator (calibrated 0.001” or
0.01 mm)
•
Hydraulic Jack
1. Remove dies or tooling from the press.
WARNING
MAKE CERTAIN THAT THE FLYWHEEL IS COM-
PLETELY STOPPED AND THAT THE POWER HAS
BEEN DISCONNECTED FROM THE DRIVE MOTOR
BEFORE REMOVING DIES.
2. Clean the slide face and the top surface of the bed
(or bolster).
3. Place the POWER, OFF-ON-BAR Selector Switch
in the ON position.
4. Turn ON the air supply to the press.
5. Start the main drive motor and lubrication pump
motor and make certain that oil is dripping from the
gibs.
6. Place the Stroking Selector Switch in the INCH
position. Then position the slide at Bottom Dead
Center (BDC) of the stroke.
WARNING
MAKE CERTAIN THAT ALL PERSONS AVOID ANY
PINCHING POINTS ASSOCIATED WITH THE OPER-
ATION OF THE PRESS AND/OR ITS AUXILIARY
EQUIPMENT.
G - 4
!
!
TOTAL BEARING CLEARANCE CHART
PRESS SIZE TOTAL CLEARANCE
No. 4 - 101
.0065” to .011”
(.165 mm to .279 mm)
No. 5 - 101
.008” to .013”
(.203 mm to .330 mm)
No. 6 - 101
.008” to .013”
(.203 mm to .330 mm)
No. 7 - 101
.010” to .015”
(.254 mm to .381 mm)
INDIVIDUAL BEARING CLEARANCE CHART (NEW PRESS)
PRESS SIZE MAIN BEARING CONNECTION BEARING BALL BOX BEARING
No. 4 - 101
.0025” to .004”
(.064 to .102 mm)
.004” to .006”
(.102 to .0152 mm)
.000” to .001”
(.000 to .025 mm)
No. 5 - 101
.003” to .005”
(.076 to .127 mm)
.005” to .007”
(.127 to .178 mm)
.000” to .001”
(.000 to .025 mm)
No. 6 - 101
.003” to .005”
(.076 to .127 mm)
.005” to .007”
(.127 to .178 mm)
.000” to .001”
(.000 to .025 mm)
No. 7 - 101
.004” to .006”
(.102 to .152 mm)
.006” to .008”
(.152 to .203 mm)
.000” to .001”
(.000 to .025 mm)
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