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what is PCD? How to calculate the distance between the two adjacent holes?

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What is PCD?          It is called pitch circle diameter, is also called bolt circle diameter. The center of each holes or bolts that are passing on a circumference of a circle. It is the circle on which the holes are going to be done.  EXAMPLE: 8 holes to be equally in a 200 mm pitch circle then the division; a =dia×0.3827  =200×0.3827  =76.54 m m 1 .FOR THREE HOLES: No. of hole on the pitch circle Diagram Formula                     3 Holes                  A= pcd×0.66                 ...