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6
SELECTION & ORDERING INFORMATION, INCH SERIES
Selection Procedure
1. Determine the output speed and torque required for your application. The maximum recommended output
speed is 3000 rpm for 1:1 units, and 1500 rpm for 2:1 units. 2:1 units are NOT recommended for use as
speed increasers.
2. Select an application service factor from the chart to the right. Multiply your torque by the selected service
factor. If you are unsure of the factor to be used, please consult us.
3. Using the chart below, find your output speed on the left. If your speed is not shown, use the next highest
speed. Depending on the ratio you need (1:1 or 2:1) , follow the chart across until you find a torque value
that is larger than your corrected torque value.
4. The Unit Size you need will be at the top of that column. There are 5 sizes available. At the bottom of the
column is a list of the various models available under the selected size. Select the model number; based
on the gear ratio and the number of shafts you need (2 or 3). When ordering, use the model number you
selected, along with the ratio desired.
5. Check the applied radial and thrust loads on the unit compared with loads in the chart at the bottom of the
page. If the applied loads are larger than the chart values, a larger unit must be selected.
6. Refer back to pages 4 and 5 for dimensional information on the model you selected.
Selection Example
An application to connect a drive-shaft to a fan-shaft at a right-angle. Gearbox ratio to be 1:1. Input and output connections are
with timing belt pulleys at 1000 rpm. Transmitted power is 1.34 HP. Operating conditions are moderate shock, 12 hours/day.
1. Output speed is 1000 rpm. Operating torque = 63,000 x 1.34 HP / 1000 rpm = 84.4 in.lb.
2. Service factor from chart (12 hours/day, moderate shock) – SF = 1.3. Corrected torque = 84.4 x 1.3 = 109.7 in.lb.
3. From ratings chart (output speed = 1000 rpm), unit torque = 193 in.lb (>109.7 in.lb) – Size 3 1:1.
4. The model selected is: R3330 for two-way or R3350 for three-way.
5. The applied radial loads are calculated to be 74 lb. on each shaft (<100 lb.) which is llowable.
6. On pages 4 and 5, the dimensions are checked to confirm available space for model selected.
SIZE 1
SIZE 2
SIZE 3
SIZE 4
SIZE 5
Ratio
1:1
2:1
1:1
2:1
1:1
2:1
1:1
2:1
1:1
RATINGS*
in.lb HP in.lb HP in.lb HP in.lb HP in.lb HP in.lb HP in.lb HP in.lb HP in.lb HP
50 17 0.01 10 0.01 51 0.04 32 0.03 229 0.18 125 0.10 400 0.32 193 0.15 800 0.63
100 16 0.03 10 0.02 49 0.08 30 0.05 215 0.34 117 0.19 370 0.59 182 0.29 740 1.17
200 15 0.05 9 0.03 48 0.15 28 0.09 207 0.66 110 0.35 345 1.10 172 0.55 700 2.22
300 15 0.07 9 0.04 47 0.23 27 0.13 205 0.98 105 0.50 325 1.55 162 0.77 660 3.14
400 14 0.09 8 0.05 47 0.30 26 0.17 203 1.29 100 0.63 310 1.97 154 0.98 625 3.97
500 14 0.11 8 0.06 46 0.37 25 0.20 200 1.59 96 0.76 300 2.38 148 1.17 600 4.76
750 13 0.15 8 0.09 46 0.54 24 0.29 196 2.34 91 1.08 278 3.31 137 1.63 565 6.73
1000 13 0.20 8 0.12 45 0.71 23 0.37 193 3.06 87 1.38 265 4.21 130 2.06 540 8.57
1250 13 0.25 7 0.14 44 0.88 23 0.45 190 3.77 84 1.67 260 5.16 128 2.53 520 10.32
1500 13 0.30 7 0.17 44 1.05 23 0.54 187 4.45 81 1.93 257 6.11 125 2.98 500 11.90
1750 12 0.34
43 1.21
185 5.14
254 7.04
485 13.47
2000 12 0.39
43 1.37
183 5.80
250 7.95
470 14.92
2500 12 0.48
42 1.68
179 7.11
245 9.73
448 17.76
3000 12 0.57
42 1.99
176 8.39
241 11.5
425 20.24
2-WAY
R3000 R3000-2
R3200 R3200-2 R3330 R3330-2 R3400 R3400-2
R3570
3-WAY
R3100 R3100-2
R3300 R3300-2 R3350 R3350-2 R3500 R3500-2
R3590
2-WAY
R3003 R3003-2
R3203 R3203-2
3-WAY
R3103 R3103-2
R3303 R3303-2
MODEL
DATA (lbs)
R3000
R3100
R3200
R3300 R3330
R3350
R3400
R3500 R3570 R3590
1:1 2:1 1:1 2:1 1:1 2:1 1:1 2:1 1:1 2:1 1:1 2:1 1:1 2:1 1:1 2:1 1:1 1:1
RADIAL LOAD 25 25 25 25 50 50 50 50 100 100 100 100 100 100 100 100 100 100
THURST LOAD 50 50 50 50 100 100 100 100 200 200 200 200 200 200 200 200 200 200
WEIGHT
0.5 0.5 0.5 0.5 2.2 2.2 2.4 2.4 8.7 8.7 9.0 9.0 14.5 14.5 15 15 17.5 18
* Unit ratings are: Output Torque in in.lb and Output Power in HP.
OUTPUT SPEED (RPM)
OPERATING
UNIFORM MODERATE
CONDITIONS
LOAD
SHOCK
3
0.7
0.9
8
0.9
1
12
1
1.3
24
1.3
1.8
T (in.lb) = 63,000 x HP / RPM
HP = T x RPM / 63,000
SERVICE FACTORS
SERVICE
(hours/day)
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