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OPERATION & MAINTENANCE
MANUALS

Pump Drive
Drive Shaft
A Series
Fan Drive
Fan Drive (French)


Amarillo Gear Co.
 P.O. Box 1789
2401 Sundown Lane
 Amarillo, Texas 79105
Phone - (806) 622-1273
Fax - (806) 622-3258

 

 





Amarillo Composite Drive Shafts Selection




Selection Procedures


1. Email or fax a completed Application Data Request Form to Amarillo Gear Co. at
Fax: 806-622-3258 or info@amarillogear.com

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2. Use Amarillo Gear Company's automated selection program on CD ROM or at www.amarillogear.com. Just enter your application data and let the program do the rest.

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3. Use the manual selection method as shown below.



a. Determine the motor torque in in-lb using the following equation:

Motor torque = Motor HP x 63,000 / Motor RPM

b. Select the model that provides equal or more continuous torque rating from the Engineering Data Table II. Note that the values in Table II include a 2.0 service factor. Make sure the maximum peak overload torque is less than the allowable peak overload torque shown in the Engineering Data Table II.

c. Select the tube size (last 4 digits of the model number) with a maximum DBSE that meets or exceeds the application's DBSE at the motor speed.

Example:

 Motor Torque (1785 rpm, 75 hp motor) = 2647 in-lb
Application DBSE = 120"

Selection: Model CF60 425L (torque rating = 3175 in-lb, Max. DBSE at 1785 rpm is 122")


d. Calculate the critical speed (ωc) of the shaft using the following equation:



ωc =
A x 7.8 x 106
DBSE2*
*(DBSE is in inches)

Last 4 digits of model number
275M or L
275X
425L
425X
600L
 600X 800L 800X 950X 1150X
Value for "A"
2.317
2.967
3.881
4.855
5.955
 6.881 7.199 8.861 10.532 12.778

e. Make sure that the calculated critical speed is at least 15% greater than the intended operating speed, or 2050 for this example, and that the first three harmonics of blade pass frequency (fan speed x number of fan blades) are at least 10%, 7.5% & 5% respectively, away from the critical speed. If either condition is not met, choose the next model down (Table II) and recalculate the critical speed.

Example:
 Tube Size/Type = 425L DBSE = 120"
Fan Speed:
 120 rpm Number of Blades: 8
Blade pass frequencies:
 1x = 960 cpm, 2x = 1920 cpm, 3x = 2880 cpm
Calculated critical speed = 2102 cpm
The initial selection is OK.

f. Check both shaft sizes against the maximum hub bore for the selected model.
Specify a "large" hub, or select the next larger model if necessary.