Nord Drivesystems B 1000 - Table 4: Permissible Machine Shaft Tolerances

Gear units – Manual with installation instructions
30 B 1000 en-3921
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.
Dismantling procedure
WARNING
Danger of injury due to sudden mechanical release
The elements of the shrink disc are under great mechanical tension. Sudden release of the outer
rings produces high separating forces and can result in uncontrolled detachment of shrink disc
components.
• Do not remove any tensioning bolts if you have not ensured that the external outer rings of the
shrink disc have been released from the inner ring.
1. Unscrew the tensioning bolts [2] of the shrink disc in sequence, with approximately half a turn
(180°), until the inner ring of the shrink disc can be moved.
2. Pull the shrink disc [1] with the torque bush [3] off from the shaft.
3. Remove the outer rings of the shrink disc from the conical inner ring. For this it may be necessary
to lightly tap the bolts with a soft-face hammer or to lightly lever the outer rings apart.
4. Pull the gear unit off the machine shaft.