Thwaites SPRITE NIMBUS, Manual

Page: 36 / 54

35. Ensure the pinion end is free from burrs.
36. Mount the magnetic base of the clock onto the pinion end so that the stylus
registers in the bottom of the differential bearing bore. The clock can be moved
slightly to and fro by turning the pinion in order to ensure maximum reading is
obtained.
37. Repeat operation on other differential bore.
38. Add the two readings and halve the result in order to obtain the mean figure. If the
pinion is set correctly, a mean reading of zero should be obtained. A negative mean
reading indicates that the pinion is set too high and shims need to be removed from
under the inner pinion bearing cup.
A positive reading indicates that the pinion is set too low and more shims need to be
added under the inner pinion bearing cup.
NOTES:
Fig. 17.
Fig. 18.
3-2-13