Answer:
As we all know that its impossible to get a machine which gives you exact physical parts according to the required dimension. There is always some sort of deviation in the part manufactured. The deviations are caused due to following reasons:
☛ 1) Vibration in the machine
☛ 2) Tool Wear and Tear
☛ 3) Friction
☛ 4) Mounting Error
☛ 5) Human Error
☛ 6) Environment conditions.
So to meet the actual condition of machining tolerances and allowances are provided to the dimensions. So we require GD&T.
☛ 1) Vibration in the machine
☛ 2) Tool Wear and Tear
☛ 3) Friction
☛ 4) Mounting Error
☛ 5) Human Error
☛ 6) Environment conditions.
So to meet the actual condition of machining tolerances and allowances are provided to the dimensions. So we require GD&T.
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