Correct Answer - Option 1 : Built up edge formed on the cutting tool
Explanation:
Machining a soft or ductile material like Aluminium, mild steel, HSS etc. a continuous chip will be produced with build-up edge or without build-up edge formation.
When the cutting conditions are unfavourable, such as low to the medium cutting speed, high feed and the depth of cut, the chip produced is continuous with built-up edge.
At a low cutting speeds the local temperature in the secondary shear zone or the sticking zone on rake surface increases and a higher force needed to cut the chip which results into extreme pressure in the cutting zone.
When the cutting conditions are favourable, such as high cutting speed, low feed and depth of cut, chip produced is continuous without built-up edge.
