Engineering Information
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Index Section M GENERAL ENGINEERING INFORMATION WARNING & SAFETY REMINDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OPPOSITE PAGE ITEM ELECTRICAL MOTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-8 SHAFT SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-9 — M-11 PROPERTIES OF VARIOUS METALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-15 HARDNESS CONVERSION CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-16 DECIMAL EQUIVALENT CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-17 ENGINEERING FORMULAS & CONSTANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M-20

One HP is the rate of work required to raise 33,000 pounds one foot in one minute. Torque: The twisting or turning effort around a shaft tending to cause rotation. Torque is determined by multiplying the applied force times the distance from the point where force is applied to the shaft center. TQ = F (force) x R (radius) 63,025 x HP RPM = Force x Lever Arm (in Inches) 5,252 x HP = RPM = Force x Lever Arm (in Feet) Torque (in Pound-Inches) = Torque (in Pound-Feet) Torque Calculation Example 20 HP at 100 RPM = 12,605 Pound-Inches Torque 2.0 HP at 10 RPM = 12,605 Pound-Inches Torque Force =...

Electrical Formulas Electrical Formulas Amperes when horsepower is known Amperes when kilowatts are known Amperes when Kva are known Kilowatts HP x 746 HP x 746 E x Eff. x pf 1.73 x E x Eff. x pf Kw x 1000 Kw x 1000 E x pf 1.73 x E x pf Kva x 1000 Kva x 1000 E 1.73 x E I x E x pf 1.73 x I x E x pf 1000 1000 IxE 1.73 x I x E Kva 1000 1000 I x E x Eff. x pf 1.73 x I x E x Eff. x pf Horsepower = (Output) 746 746 I = Amperes; E = Volts; Eff. = Efciency; pf = power factor; Kva = Kilovolt amperes; Kw = Kilowatts; R = Ohms Alternating or Direct Current Amperes when voltage and resistance is known...

Motor Frame Dimensions Frame Size Shaded area indicates typical single phase standard squirreM-cage, open type, a-c motors. Balance of table same except three phase, design A and B. L When these motors are used with V-belt or chain drives, the correct frame size is the one with the sufx “S” omitted — consult manufacturer.

Shaft Selection Shaft Selection Important factors to consider when calculating shaft size (a) shafting is subject to a bending moment and a torsional moment. (b) bending moment is that force which tends to bend a shaft. torsional moment is that force which tends to twist a (c) shaft. (d) shaft size is determined by the combined action of the bending and torsional moments. A = Shaft length from center of bearing to center of load L = Unbalanced load in pounds W = Suspended weight of elevator (chain, buckets, etc.) in pounds R = Radius of wheel in inches B = Bending moment T = Torsional...

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ESFUERZO AL CORTE FACTOR DE DISEÑO Las gráficas de selección están basadas en un esfuerzo de corte de 6,000 PSI. Para un diseño de esfuerzo de corte que no sea de 6,000 PSI o de transmisión por ejes de aleación tratados con calor, el diámetro obtenido en el cuadro deberá ser multiplicado por los factores mostrados en la tabla anterior. Cuando la transmisión por ejes no contenga cuñeros, el tamaño obtenido del cuadro podrá ser multiplicado por un factor de 0.91. Momento de Flexión en Miles de Libras Pulgada Shaft Tables

Flywheel Formulas Flywheels are occasionally used on a few machines, such as air compressors, to even out load pulsations. These formulas are useful in designing entire ywheel rims. It is also possible to use V-Belt sheaves as a ywheel thus eliminating the need for a separate ywheel in the system. Consult Martin with specic requirements. Formulas for Entire Flywheel W R N t F D d P weight (pounds) radius of gyration (feet) speed (RPM) time to change from N1 to N2 (seconds) face of rim (inches) outside diameter of rim (inches) inside diameter of rim (inches) weight per cubic inch of material...

Weights of Steel NOTE: The steel weights in this section are nominal and are based on an approximate weight of 40.80 pounds per square foot, one inch thick. There may be differences between nominal weights and actual scale weights because of variation in manufacturing practices. Hot Rolled and Cold Finished Steel Products Nominal Weight Plates, Strip and Flats Hot and C.R. Sheets Steel Rounds Size in Inches Inches Feet Feet Feet Feet Inches Feet Feet Feet Feet Length .2833 x T x W x L 3.4 x T x W x L 40.8 x T x W x L Wt./Sq. Ft. x W x L Wt./Sq. Ft. x W x L .2904 x T x W x L 3.485 x T x W x...

Steel Properties Properties of Steel The information shown below is offered as a general guide to physical properties of steel in common use. Lower tensile properties are to be expected in large sections; the values of strength decrease as the size of the section increases. These values are not guaranteed and must NOT be used in specifying the raw materials or as a basis for acceptance or rejection of material. It must not be assumed that these properties will be obtained in all cases as they vary widely with permissible variations in analysis, size of section, rolling conditions, grain...

Metal Properties Physical Properties of Various Metals ALUMINUM, TYPE 3003-0, ANNEALED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ALUMINUM, TYPE 3003-H18, HARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ALUMINUM, TYPE 5052-0, ANNEALED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ALUMINUM, TYPE 5052-H38, HARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ALUMINUM, TYPE 5056-0, ANNEALED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ALUMINUM, TYPE 2014-0, ANNEALED . . . . . . . . . . . ....