The work axis is kept out of alignment with the lathe axis and the tool movement is parallel to lathe axis

The work axis is kept in line with the lathe axis and the tool is made to move at an angle to lathe axis

The live and dead centres are moved in opposite directions to keep the work axis out of alignment with the lathe axis

The lathe axis is kept out of alignment with the work axis and the tool is made to move at an angle to the lathe axis

Work stationary, tool adjusted and positioned in the groove by compound slide and cross slide

Work stationary, tool adjusted and positioned in the groove by carriage hand wheel and cross slide hand wheel

Work revolving, half nut engaged, tool positioned in the groove by compound slide and cross slide

Work revolving, half nut engaged, tool positioned in the groove by carriage and cross slide hand wheels

quick production of threads

cutting threads on soft metal directly

rectifying threads cut on steel rods which are distorted

rectifying crest and root of threads formed by single point tool

To prevent bending of long shafts due to cutting force

To avoid load on the lathe centres while turning long shafts

To reduce the load on the cutting tool while turning

To ensure to turn at higher cutting speeds than recommend

equal in numbers but unequal in pitch

unequal in numbers but equal in pitch

unequal in numbers and unequal in pitch

equal in numbers and equal in pitch