The letter K in the conventional abrasive wheel specified by 51 A 60 K 5 V 05 denotes the -
Hardness of the wheel
The Grade refers to the Hardness of the wheel, which indicates how strongly the bond material holds the abrasive grains in place. Based on the standard abrasive wheel specification system, the letter 'K' in the position following the grain size indicates the Grade, which directly corresponds to the Hardness of the wheel.
Important Questions from Different Machining Processes
When the file is pushed and pulled across the work, it is called:
A copper bar of diameter 200 mm is turned with a feed rate of 0.25 mm/rev with depth of cut of 4 mm. Spindle speed is 160 rpm. The material removal rate (MRR) in mm3/s is :
The manufacturer has marking on a grinding wheel as ' A 36 L 5 V'. The code 'V' represents the:
- In centreless grinding the regulating wheel is inclined at an angle of
A 20 mm diameter through-hole is to be drilled in a 30 mm thick plate using a double fluted, 120° lip angle drill. The drill tip is at a distance of 3 mm from the plate surface when cutting started and an over travel of 2 mm is recommended. If the drill rotates at 500 rev/min and the feed per revolution is 0.1 mm, the machining time of operation (in sec) will be
