NORD Drivesystems B1000 - Manual (Page 58)

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INTRODUCTION
G1000 – Subject to Change Without Notice
Helical-Worm Overhung Load
Calculation Tables
Calculation Table for OHL at Output Shaft for Worm Units
Gearbox
Type y z c c f U V T
2max
Standard
Bearings
VL
Bearings
[in] [in] [lb-in] [lb-in] [in] [in] [in] [lb-in]
SK 02040 3.92 4.55 620 – 0 0.750 1.50 832
SK 02050
4.09 5.08 1,062 1,682 0 1.000 2.12
1,487
SK 13050 1,584
SK 12063
4.67 5.85 1,682 2,655 0 0.250 2.75
3,115
SK 13063 3,336
SK 12080
5.91 7.28 1,859 3,629 0 1.375 2.75
6,230
SK 13080 6,744
SK 32100
7.05 8.82 4,514 8,319 0 1.875 3.50
12,558
SK 33100 13,974
SK 42125
9.19 11.56 11,771 19,382 0 2.375 4.50
24,276
SK 43125 27,063
R
R
CAUTION
When gear units are fl ange mounted opposite shaft, their OHL capacity is greatly
reduced compared to the standard catalog ratings. Please consult NORD for
details on OHL ratings.
F
OHL
= Calculated OHL on gearbox shaft [lb]
T = Load torque on shaft [lb-in]
d
0
= Pitch diameter of overhung component [in]
f
z
= Power transmission component factor
F
OHL
=
2 x T x f
z
After calculating F
OHL
compare to the
overhung load capacity found in the tables.
F
OHL
≤ F
R
or F
R1
If F
OHL
exceeds the rated capacity (F
R
or F
R1
) of the
speed reducer then either heavy-duty bearings
or a larger gearbox must be selected.
d
o