marposs M1 Star MBG, Instruction Manual, Page: 23 / 58

23
REPLACEMENT OF PARTS
AND COMPONENTS
3
3.1.5
DISASSEMBLY OF BUSHING, ROD AND SPRING
Together with the indicator, the spring supplies the measuring force of the contacts on
the part to be measured. It can be removed in order to decrease the measuring force of
the contacts.
The procedure for the disassembly of these components depends on the measuring
range of the measuring armset, due to this reason the appropriate procedure has to be
chosen.
Fig. 1 shows the seat to apply the wrenches, while the relevant table indicates the type
of wrench to be used in relation to the measuring range of the bore gauge.
DISASSEMBLY OF BUSHING FOR RANGE 3 - 7.5 mm
1. Disassemble the plug gauge from the handle (see page 11).
2. Firmly apply wrench “A” to the spacer seat “1” (see Fig. 2), then unscrew bushing
“2” by means of the wrench “B”.
3. Extract the unit composed by rod “C” + bushing “A” + spring “B” (see Fig. 3).
4. Extract the components, drawing them off the rod.
ASSEMBLY OF BUSHING FOR RANGE 3 - 7.5 mm
1. Assemble the unit composed by rod “C” + bushing “A” + spring “B” (see Fig. 3).
2. Insert and manually screw the rod unit to the measuring armset
3. Firmly apply wrench “A” to the spacer seat “1”, then lock (*) the bushing “2” by
means of the wrench “B”.
4. Assemble the plug gauge to the handle (see page 11).
(*) On the table 1 are expressed the suggested torques to lock the rod unit.
3
≤
ø<5,5 5,5
≤
ø<7,5
A
B
2,5 A/F 2,5 A/F
2,5 A/F 2,5 A/F
7,5
≤
ø<9,5 9,5
≤
ø26
- -
2,5 A/F 3,5 A/F
26
≤
ø
-
6 A/F
1
3
“A”
“B”
“B”
“b”
“a”
“c”
2
“2”
“B”
“A”
“1”
RANGE 3-7,5 RANGE 7,5-300
Tab. 1
S SS SS
UGGESTED UGGESTED UGGESTED UGGESTED UGGESTED
T T T T T
ORQUES ORQUES ORQUES ORQUES ORQUES
Ø
3 < 5,5
Ø
5,5
≤
7,5
R
OD UNIT
0,16 N
M
0,16 N
M