KRPX+ User manual
Ref.: RX182/010
Version 01/2017 - English
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Page 16 / 24
(1)
(2)
4.4
Proper tooth meshing validation
Checking that both pinions are properly meshing with the rack by measuring the clearance between rack
and pinion teeth (t
b2
)
Place two indicators as follow:
1.
-
One between the KRPX+ housing or carriage and a fixed
reference (1).
-
One between the KRPX+ pinion (at pitch diameter) and a
fixed reference (2).
Move the carriage in one direction by turning the
2.
gearbox input shaft.
Set the two indicators position at “0”.
3.
Turn the input shaft to move the carriage in the other direction until both indicators have moved.
4.
The difference between the measurements of the two indicators gives the backlash between rack &
pinion teeth (t
b2
). Compare the value with the values given in the table below.
Size
t
b2
acceptable backlash
between rack and pinion
KRPX1+
0.070
+0.015
mm
-0.015
mm
KRPX2+
0.100
+0.015
mm
-0.015
mm
KRPX3+
0.135
+0.035
mm
-0.035
mm
KRPX4+
0.135
+0.05
mm
-0.05
mm
KRPX5+
0.205
+0.070
mm
-0.070
mm
Explanation of t
b2
:
In case of a Twin arrangement (2 KRPX+), this operation should be done for both pinions independently.
It is also strongly recommended to repeat this operation at the highest and lowest points of the rack
topography (see chapter 4.1).
