NTN - Precision Rolling Bearings

Technical Data
(2) Setup of mounted internal clearance gage
¡Place the cylinder gage, onto the bore surface of
clearance adjustment gage as shown in Photo 6.5,
and adjust it with the open/close bolt so that its dial 1
is set to zero (see Photo 6.6).
¡When the reading of dial 1 of the cylinder gage is
zero, adjust the gage bolt so that the pointer of dial 2
points at the red mark (correction amount of the
gage). (Photo 6.6)
With the gage bolt, adjust the gage so that the short
pointer is situated at the scale 2 position. (With the
large size, insert the pin into the hole of the open/
close bolt and make fine-adjustment.)
NOTE 1) Photo 6.6 shows the inner ring and rollers. When
the correction amount of the gage is adjusted, adjust
it only with the thickness gage.
NOTE 2) The pointer of dial 2 is directed to the red mark. The
purpose of this is to compensate clearance error
caused due to the structure of mounted internal
clearance gage. The correction amount can vary
from gage to gage.
NOTE 3) When the pointer of dial 2 is in line with the red
mark, the zero reading on dial 2 coincides with the
zero bearing clearance.
(3) Setting up the mounted internal clearance gage
on the main spindle
¡Mount the inner ring onto the main spindle, and lightly
tighten the bearing nut.
¡Tightening the open/close bolt (see Fig. 6.23) on the
clearance adjustment gage will cause the gage bore
to expand.
With the gage bore expanded by about 0.15 mm,
insert the gage into the outside diameter portion of
the roller set in the inner ring. Be careful not to
damage the rollers (Photo 6.7).
¡Loosening the open/close bolt will cause the gage
bore to shrink.
Loosen the open/close bolt to bring the gage bore
into contact with the outside diameter of the ball set in
the inner ring.
¡Lightly swing the clearance adjustment gage in the
circumferential direction to stabilize the pointer on the
dial indicator.
the distance between the inner ring side face and
shaft shoulder (dimensionRin Fig. 6.24).
¡Measure this dimension in at least three locations,
and finally adjust the spacer widthRto the average of
three measurements.
¡Loosen and remove the shaft nut, inner ring spacer
and inner ring from the main spindle.
Dial 2
Photo 6.5
Photo 6.6
Dial 1
(4) Setup of inner ring clearance
¡Tighten the shaft nut of the main spindle. This should
be done gradually to prevent shock loading.
¡Tightening the nut further until the reading on the dial
of the clearance adjustment gage becomes zero in
case the clearance is aimed at 0 m.
¡Once the reading on gage gets zero, carefully swing
the adjustment gage again to check that the
measurement value is correct.
¡Loosen the open/close bolt on the clearance
adjustment gage to expand the gage bore and
remove the gage from the inner ring.
R
Photo 6.7
Shaft nut
(5) Determination of spacer width
¡The inner ring should now be in the position where
the reading on the dial of clearance adjustment gage
was zero in step (4). By using a block gage, measure
Fig. 6.24 Spacer width dimension
35