Production Engi...

A stepper motor of 300 steps per revolution is mounted on the lead screw of a drilling machine. The lead screw pitch is 5 mm. The BIU of system is ______ (mm)

In an electron beam welding process, the voltage used is 45 kV and the beam current in 60 mA. The beam is focused on a circular area 0.25 mm in diameter and the heat transfer factor is 0.87. The average power density of the beam in kW/mm² is ________

The command M02 is used in CNC programming for

In an ECM process for machining iron it is desired to obtain a metal removal rate of 1 cm³/min. Atomic weight of iron = 56 gm, valency = 2, density of iron = 7.8 gm/cm³, F = 1609 amp-min. The amount of current required in the process is

In NC machine, the stepper motor of X-axis is connected to a lead screw having double start screw threads of 4 mm pitch. If the specialization of motor is 800 pulses/one revolution of motor, the positioning accuracy of motor is _______

In an electric discharge cutting of a 12 mm × 8 mm × 6 mm hole, the resistance and capacitance in relaxation circuit are 45 Ω and 10 μF. The supply voltage for maximum power supply is 250 V and the metal removal rate is given by, θ = 27W^1.70 (θ in mm³ / min, W is power input in kW). What is the time required to complete this operation? _______ hr

In an electrochemical machining process using NaCl as electrolyte, the gap between the tool and workpiece is 0.30 mm and the supply voltage is 14 V DC. If the specific resistance is 4 Ω cm and cross-section machined is 30 mm × 30 mm, then which of the following are true? (Take A = 56, ρ = 7700 kg / m³, Z = 3)