PRÜFTECHNIK ROTALIGN ALI 3.500 - Soft Foot Examples

6-25
ROTALIGN 01.2000
Soft foot examples
The following notation is used for these examples:
◆ The feet are shown oversize outside of the machine outline.
◆ ROTALIGN readings are outside the feet.
◆ Feeler gauge readings are inside the feet.
◆ Blank spaces mean the reading is not available.
◆ Feet are named clockwise A to D
For maximum accuracy during soft foot measurement (and espe-
cially when coupling play is present), the shafts should be rotated
so that the sensors are oriented vertically (12:00 - 6:00 direction).
Example 1
Advanced diagnosis & correction of soft foot
0
44
44
4
44
44
4
44
44
4
00
00
0
100100
100100
100
8888
8888
88
8888
8888
88
9292
9292
92
8888
8888
88
00
00
0
00
00
0
8484
8484
84
00
00
0
80
4
76
Foot notation
clockwise A - D
ROTALIGN Soft foot
readings
Feeler gauge readings
ROTALIGN readings show near perfect rock, tempting the inexperi-
enced aligner to shim feet B and D. In this case, that would be a
mistake. The 4/100 mm difference diagonally, with near zero read-
ings on the other diagonal, prompts feeler gauge examination of feet
B and D. The feeler gauge results show very similar average gaps
between feet B and D, but one is plainly sloped while the other is
nearly flat.
Conclusion: shim only foot D 88/100 mm and recheck all four feet.
C
D
A
B
F
Note