The formula for calculating the tailstock offset is: Offset = L × (D - d)/2 × L1 where L is the total length of the piece and L1 is the length of the taper. D is the large diameter and d is the small diameter. If a shaft, that is to be tapered on one end , is 8 inches long and the taper is to be 3 inches in length, the shaft diameter is 1-1/4 inches and the small end of the taper is 1 inch
diameter, the offset should be:
A) 1/3 (.333 ) inch B) .250 inch C) .100 inch D) 2.3 (.666 ) in.
A
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A dc, separately excited motor has an armature resistance of 1 ?. When a dc supply of 100 V is applied to the motor, the armature current is 4 A and the motor speed is 300 rpm. A half-wave SCR converter is designed to control the motor speed. The supply voltage is 120 V (rms), and the triggering angle of the converter is adjusted to 60o . When the motor is loaded with a constant-load torque of 10 Nm, the conduction angle is 175o . Assume that the field current is constant.
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