5
Installation/assembly
Mounting tolerances
Assembly and Operating Instructions – M1..N Series Single-Stage Helical Gear Units
51
Measuring
instruments
Angular offset
Axis offset
Micrometer
dial
a1
a2
a
D
a
f2
f1
899597451
b
f2
f1
A prerequisite for this measuring method is
that there is no axial play in the shaft bear-
ings when the shafts rotate. If this condition
is not fulfilled, the axial play between the
faces of the coupling halves must be elimina-
ted. As an alternative, you can use two mi-
crometer dials positioned on the opposite
sides of the coupling (to calculate the differ-
ence of the two dial indicators when rotating
the coupling).
The following figure shows the how to mea-
sure axial offset using a more accurate mea-
suring method, as described above. The cou-
pling halves are rotated together without let-
ting the point of the dial indicator slide onto
the measuring surface. The axial offset is ob-
tained by dividing the deviation displayed on
the dial indicator (dimension "b").
29203856/EN – 03/2020
