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

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

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Manufacturing And Production Technology
Trepanning is an operation of

Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Making a cone-shaped enlargement of the end of a hole
Smoothing and squaring the surface around a hole

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Manufacturing And Production Technology
Jigs are used

For holding and guiding the tool in drilling, reaming or tapping operations
For holding the work in milling, grinding, planing or turning operations
To check the accuracy of workpiece
None of these

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