nord 6052902/0213, Manual With Installation Instructions, Page: 39 / 128

3 Transport, storage, assembly
B 1050 en-3921 39
Metric machine shafts Imperial machine shafts
From to
ISO 286-2
Tolerance h11(-)
From to
ISO 286-2
Tolerance h11(-)
Ø [mm] Ø [mm] [mm] Ø [in] Ø [in] [in]
10 18 -0.11 0.4375 0.6875 -0.004
18 30 -0.13 0.7500 1.0625 -0.005
30 50 -0.16 1.1250 1.9375 -0.006
50 80 -0.19 2.0000 3.1250 -0.007
80 120 -0.22 3.1875 4.6875 -0.008
120 180 -0.25 4.7500 7.0625 -0.009
Table 4: Permissible machine shaft tolerances
Fitting procedure
1. Determine the correct installation position of the shrink disc [1] on the gear unit. Ensure that the
position of the hollow shaft [5] corresponds to the details in the order.
2. Push the support bush [7] and the clamping ring [4] on the solid shaft [6]. Ensure that the support
bush is correctly positioned. Secure the support bush [7] with the clamping ring [4] by tightening the
clamping ring bolt.
3. Push the gear unit up to the stop on the secured support bush [7].
4. Slightly loosen the tensioning bolts [2] and push the shrink disc [1] on the solid shaft.
5. Push the torque bush [3] on the solid shaft.
6. Tighten the 3 or 4 clamping bolts [2] finger tight and ensure that the outer rings of the shrink disc
are pulled together parallel. Then tighten the remaining bolts.
7. Tighten the tensioning bolts successively in a clockwise direction by several turns – not crosswise
– with approx. ¼ rotation of the bolt per turn. Use a torque wrench to achieve the specified
tightening torque on the shrink disc.
When the tensioning bolts have been tightened, there must be an even gap between the clamping
flanges. If this is not the case, dismantle the shrink disc connection and check the fit.