Manufacturing And Production Technology
In machining metals, surface roughness is due to

Cutting tool vibrations
Fragment of built-up edge on the machined surface
Feed marks or ridges left by the cutting tool
All of these

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Manufacturing And Production Technology
In a shaper, the length of stroke is increased by

Increasing the length of the arm
Decreasing the centre distance of bull gear and crank pin
Decreasing the length of the slot in the slotted lever
Increasing the centre distance of bull gear and crank pin

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