Example Selection 1 A sprocket to be tightened by a POWER-LOCK ® on a shaft.
Example Selection 2 Turn table to be fixed on a vertical straight shaft by a POWER-LOCK.
<Conditions>
<Conditions>
Shaft Dia. d = 2 ” = 1/6 (ft.) Max. Required Torque Tmax. = 500 ft./lbs. Total Table Weight Pmax. = 500 ft./lbs. Material for table and hub is 1040
Shaft Dia. d: 1 ¹⁄₂ ” Max. required torque Tmax. = 400 ft./lbs. Sprocket Hub Material 1144 Y.P. = 56,000 psi Sprocket Hub Length (B) = 1.875 ” Sprocket Hub Dia. (D S ) = 3.5 ” Counter Bore Length (b) = L 1 (Total PL Length) Step 1 Select PL1 ¹⁄₂ since shaft dia. is 1 ¹⁄₂ ” See Transmissible Torque (Mt) on page D-21 Mt (658) Tmax. (400) OK POWER-LOCK Outside Dia. D = 2.559 ” POWER-LOCK Total Length L 1 = 1.024 ” POWER-LOCK Length = 0.709 ” Step 2 Confirm Min. Hub Dia. D N 2 = 2 • 0.709 = 1.418 B (1.875) 2 (1.418) OK Refer Min. Hub Dia. D N to page D-22 D N = 3.030 D S (3.5) D N (3.030) OK
Step 1
Select PL2 since shaft Dia. is 2 ” See Transmissible Torque Mt and Thrust Pax on page D-21 Mt = 1627 ft./lbs. Pax = 19,360 lbs.
Step 2
Compare Mt with composite torque MR. Calculate composite torque MR. MR = T 2 max. + (Pmax. • –) 2 = 501.7 ft./lbs. MR (501.7) Mt (1,627) OK d 2
Step 3
Step 3 Confirm Sprocket Hub Length B Min. Hub Length Bmin. =
d 2 Hub Dimensions. See page D-22 Suggested Min. Hub Dia. (D N ) = 4.110 ” Suggested Guide Length = – = 1 ” Step 4 Machining Tolerance. See page D-21 Shaft Size (d) = 2 ” + 0/–0.0018 ” Hub Bore Size (D) = 3.346 + 0.0018 ” /–0
1.5 2
d 2
d 2
b + – = L 1 + – = 1.024 + – = 1.774
B (1.875) > Bmin(1.774) OK Centering Guide will be 1.875 – b
= 1.875 – 1.024 = 0.851 0.851 > – (0.75) OK
d 2
Step 4
Machining Tolerance. See page D-21 Shaft size (d) = 1.5 ” + 0/–.0015 ” Hub Bore Size (D) = 2.559 ” + .0015 ” /–0
D-30
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