BIM 1013/2008/11
Page 2 of 10
www.nord.com
INSTALLATION OF UNIT
To ensure reliable service and dependable performance, an enclosed gear drive must be rigidly supported and the shafts accurately aligned.
Folioing are some precautions required to accomplish this end.
FOUNDATION
The responsibility for the design and construction of the
foundation is with the user. The foundation must be adequate to
withstand normal operating loads and possible overloads while
maintaining alignment to attached system components under
such Ioads.
MOUNTING POSITION
Unless a unit is specifically ordered for inclined mounting, the
foundation must be Ievel and flat. The Iubrication system may not
operate properIy if the unit is not mounted in the position for which
it is designed. It may be desirable to elevate the foundation to
facilitate oil drainage.
CONCRETE FOUNDATION
If a concrete foundation is used, steel mounting pads and boIts of
sufficient size to distribute the stress into the concrete shouId be
grouted into the foundation.
STEEL FOUNDATION
If a structural steel foundation is used (i.e. wide fIange beams or
channels), a base pIate or soIe pIate of suitable thickness shouId
be used and shouId extend under the entire unit.
FOOT MOUNTED UNITS
Use shims under the feet of the unit to align the output shaft to the
driven equipment. Make sure that all feet are supported so that
the housing will not distort when it is bolted down. Improper
shimming will reduce the life of the unit and may cause failure.
Dowel pins may be installed to prevent misalignment and ensure
proper realignment if removed for service.
FLANGE MOUNTED UNITS
If a structural steel foundation is used (i.e. wide fIange beams or
channels), a base pIate or soIe pIate of suitable thickness shouId
be used and shouId extend under the entire unit. If a bulk head
pIate is used it shouId be of proper strength to minimize buckling
distortions.
FIange PiIot ‘AK’ or ‘AK1’ toIerance
Metric (mm)
>
∅
50
≤
∅
80 = +0.012/-0.007
>
∅
80
≤
∅
120 = +0.013/-0.009
>
∅
120
≤
∅
180 = +0.014/-0.011
>
∅
180
≤
∅
230 = +0.016/-0.013
>
∅
230
≤
∅
315 = +0.000-0.032
>
∅
315
≤
∅
400 = +0.000/-0.036
>
∅
400
≤
∅
500 = +0.000/-0.040
Inch
>
∅
1.969
≤
∅
3.150 = +0.005/-0.0003
>
∅
3.150
≤
∅
4.724 = +0.005/-0.0004
>
∅
4.724
≤
∅
7.087 = +0.006/-0.0004
>
∅
7.087
≤
∅
9.055 = +0.006/-0.0005
>
∅
9.055
≤
∅
12.402 = +0.000/-0.0013
>
∅
12.402
≤
∅
15.748 = +0.000/-0.0014
>
∅
15.748
≤
∅
19.685 = +0.000/-0.0016
BOLT STRENGTH
BoIt size, strength and quantity shouId be verified to insure proper
torque reaction capacity whatever the mounting arrangement.
PRIME MOVER MOUNTING
Align the prime mover to the reducer-input shaft using shims
under the feet. Make sure that the feet are supported. Dowel pin
the prime mover to its foundation.
SHAFT CONNECTIONS
When connecting shafts to either the input or output of the
reducer, consider the foIIowing:
Coupling hubs should be installed in accordance with
ANSI/AGMA 9002-A86
Consult with the manufacture to determine proper assembly
and fit, prior to installing outboard sprockets or gears.
Interference fits may require heating the sprocket or gear per
the manufacturer’s recommendations, generaIIy up to 250
°
F
to 300
°
F, (120
°
C to 150
°
C), before assembling to the shaft.
NORD SHAFT TOLERANCES
Solid shaft diameter tolerance
Metric (mm)
≤
∅
18 = +0.012/+0.001
>
∅
18
≤
∅
30 = +0.015/+0.002
>
∅
30
≤
∅
50 = +0.018/+0.002
>
∅
50
≤
∅
80 = +0.030/+0.011
>
∅
80
≤
∅
120 = +0.035/+0.013
>
∅
120
≤
∅
180 = +0.040/+0.015
Inch
≤
∅
1.750 = +0.0000/-0.0005
>
∅
1.750 = +0.0000/-0.0010
Solid shaft driII and tap at shaft end
Metric (mm)
≤
∅
16 = M5
>
∅
16
≤
∅
21 = M6
>
∅
21
≤
∅
24 = M8
>
∅
24
≤
∅
30 = M10
>
∅
30
≤
∅
38 = M12
>
∅
38
≤
∅
50 = M16
>
∅
50
≤
∅
85 = M20
>
∅
85
≤
∅
130 = M24
Inch
≤
∅
0.500 = 10-24 x 0.43 deep
>
∅
0.500
≤
∅
0.875 = 1/4-20 x 0.59 deep
>
∅
0.875
≤
∅
0.938 = 5/16-18 x 0.71 deep
>
∅
0.938
≤
∅
1.100 = 3/8-16 x 0.87 deep
>
∅
1.100
≤
∅
1.300 = 1/2-13 x 1.10 deep
>
∅
1.300
≤
∅
1.875 = 5/8-11 x 1.4 deep
>
∅
1.875
≤
∅
3.500 = 3/4-10 x 1.7 deep
>
∅
3.500 = 1-8 x 2.2 deep
