Parallelism Casting of parts, which have parallel prongs supported only at one


end, present a very specialized type of problem and should be discussed fully with the foundry, prior to production.


··· ..


. l~:: Yoke castings present a very specialized type of problem


and should be discussed fully with the foundry prior to production. Since Point X is the thickest section, it is the ideal point to gate.


It is also the area where the greatest volumetric shrinkage will occur. Dimension Y, however, will be restrained by the rigid mass


of refractory. The result is that parallelism is difficult to maintain and will be .010" per l" of L, but can be bettered by control


techniques and sizing. This condition will also affect any through holes usually found in yokes-. When specified, such holes


should carry considerable finish stock if they are to be finished truly concentric or line reamed.


Refer to design section for more information. Roundness Or "Out Of Round" "Out of round" is defined as the radial difference between a


true circle and a given circumference. It is the total indicator reading when the part is rotated 360° or it can be calculated by taking


half the difference between the maximum and minimum condition. The latter technique is usually preferred as it is less time consuming. The actual method of inspection to be used, however, should be specified by the purchaser.


OUT OF ROUNDNESS


Diameter 1" 2"


TIR or lh difference between diameters .010" .015" .020" .025"


On larger diameters, linear tolerances apply.


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