Workshop Technology
The metal patterns as compared to wooden patterns require less

Machining allowance
Shrinkage allowance
Draft allowance
Distortion allowance

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Workshop Technology
The welding set up is said to have straight polarity, when

Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder is earthed
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the negative terminal and the electrode holder to the positive terminal

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