<P> Usually during removal of the pattern from the mold cavity , the pattern is rapped all around the faces , in order to facilitate easy removal . In this process , the final cavity is enlarged . To compensate for this , the pattern dimensions need to be reduced . There are no standard values for this allowance , as it is heavily dependent on the personnel . This allowance is a negative allowance , and a common way of going around this allowance is to increase the draft allowance . Shaking of the pattern causes an enlargement of the mould cavity and results in a bigger casting . </P>
<P> Usually during removal of the pattern from the mold cavity , the pattern is rapped all around the faces , in order to facilitate easy removal . In this process , the final cavity is enlarged . To compensate for this , the pattern dimensions need to be reduced . There are no standard values for this allowance , as it is heavily dependent on the personnel . This allowance is a negative allowance , and a common way of going around this allowance is to increase the draft allowance . Shaking of the pattern causes an enlargement of the mould cavity and results in a bigger casting . </P>
shake allowance is a positive or negative allowance
shake allowance is a positive or negative allowance
negative allowance
negative allowance