Introduction:
The total shrinkage allowance on a pattern refers to the amount of additional material that needs to be added to the pattern in order to compensate for the shrinkage that occurs during the solidification process. This shrinkage allowance is necessary to ensure that the final component has the desired dimensions and fits the intended assembly.

Explanation:
The total shrinkage allowance on a pattern is independent of the pouring temperature of the liquid metal. This means that the amount of shrinkage that occurs during solidification is not affected by the temperature at which the molten metal is poured into the mold.

Reasoning:
The pouring temperature of the liquid metal refers to the temperature at which the molten metal is introduced into the mold. This temperature can affect the solidification rate of the metal, which in turn can influence the amount of shrinkage that occurs. However, the total shrinkage allowance is not affected by this because it is determined by other factors.

Factors affecting the total shrinkage allowance:
1. Freezing temperature of the liquid metal: The freezing temperature of the liquid metal is the temperature at which it solidifies. This temperature can vary depending on the composition of the metal. The total shrinkage allowance is influenced by the freezing temperature because it determines the rate at which the metal solidifies and therefore the amount of shrinkage that occurs.

2. The component size: The size of the component also affects the total shrinkage allowance. Larger components tend to experience more shrinkage because there is a greater volume of material undergoing solidification. Therefore, a larger shrinkage allowance is required.

3. Coefficient of thermal contraction of solidified metal: The coefficient of thermal contraction is a measure of how much a material shrinks when it cools. Different metals have different coefficients of thermal contraction, and this can influence the total shrinkage allowance. Metals with higher coefficients of thermal contraction will experience more shrinkage and therefore require a larger allowance.

Conclusion:
In summary, the total shrinkage allowance on a pattern is independent of the pouring temperature of the liquid metal. It is determined by other factors such as the freezing temperature of the metal, the size of the component, and the coefficient of thermal contraction of the solidified metal.