Soft Foot - SKF TKSA 20 Manual De Instrucciones

3.10 Soft foot

Before starting the alignment it is recommended to
check the Movable machine for soft foot. "Soft foot"
is the expression used when a machine is not resting
equally on all feet.
To find and correct the soft foot do as follows:
1. Tighten all bolts.
2. Execute all preparation steps as per chapter 3.1 to
3.6.
3. Press + and - simultaniously to reach the soft foot
mode. The text "soft foot" should now be visible on
the screen as shown on the figure 28.
4. Position the measuring units in the 12 o'clock
position.
5. Press Next to zero the display values
6. Loosen one of the bolts and monitor the change of the displayed values.
Monitor the changes of the F1 value for a front foot, and of the F2 value for a rear foot.
• If the deviations are less than 0.05 mm (2 mils), the foot has a good support.
Tighten the bolt and go to the next foot.
• If any of the deviations is larger than 0.05 mm (2 mils), the foot or its diagonally
opposed foot is a soft foot. Tighten the bolt and check the diagonally opposed foot.
• If the deviation is larger than the previously tightened foot, then this is the soft foot.
• If not, tighten the bolt and go back to the previous diagonally opposed foot.
It is normally worthwhile to try to improve the support of the soft foot by adding
shims. Add the amount of shims corresponding to the larger deviation measured.
SKF TKSA 20
Fig. 27. Soft foot
A Soft foot
A
S
B
F1
M
C
F2
Fig. 28. Soft foot display
A
/mils
mm
21