The Design and Analysis of Conical Bore Diameter Measuring Tool Based on Incomplete Hinges

There are burrs and beveling in conical bore edge which cause that it is difficult to measuring its diameter(especially big-end),so the paper designs a measuring tool based on incomplete hinges which is available to measure its size errors easily and avoid the defects of already existing method,such as:handle trouble,can't field-working and so on.This tool measures the conical bore diameter not based on the point-contact between foot rulers measuring plane and conical bore.It is actually transforming the point-contact between foot rulers measuring plane and conical bore end plane into a space point-contact by contacting between tool locating plane and conical bore end plane,and other contacting between foot rulers measuring plane and conical bore inner plane,which can avoid affecting of burrs and beveling.It can measure the conical bore edge sizes directly in field-working and measure the taper value of conical bore indirectly.