TCH.1C-27J-2-27JG
2-14.5
MEASUREMENT OF SPRING TAB (BALANCE
TAB) SURFACES CONVENTIONAL PLAY (refer
to figure
)
(Cont'd)
D.Stepwise unload, every 2.25 lb (1.02 kg), up to
zero load and simultaneously read, on the
comparator (AGE NO. 00062), the related
displacement value of the LH (RH) spring tab.
E.Stepwise load upwards, every 2.25 lb (1.02 kg), up
to 11.24 lb (5.10 kg) maximum and simultaneously
read, on the comparator (AGE NO. 00062), the
related displacement value of the LH (RH) spring
tab.
6.Put the value obtained in a diagram and draw a graph,
load applied Vs LH (RH) balance tab displacement.
7.To calculate correctly the backlash proceed as follows
after that the diagram load applied vs surface
displacement has been drawn:
A.Draw the tangent to the highest point of the
unloading curves (U1 and U2) and of the loading
curves (L1 and L2) up to the intersection with the
surface displacement axis.
B.The backlash value C1 is the distance between the
intersection of the lines U1 and L2 read on the
surface displacement axis.
C.The backlash value C2 is the distance between the
intersection of the lines U2 and L1 read on the
surface displacement axis.
D.The total resulting backlash C is defined as the
mean value between C1 and C2.
8.Check, from the graph, that the play C is not greater
than 0.09 in (2.2 mm) , 0.5
°
.
9.Remove the test equipment and the comparator (AGE
NO. 00062) from LH (RH) spring tab.
27-10-10
2-102