Test device for checking position of hole

A test device for checking whether a position of a first circular through hole of a workpiece meets a tolerance requirement, the workpiece comprising a first reference surface, and a second reference surface, a central axis of the first circular through hole being parallel to the first reference surface and the second reference surface, a design distance between the central axis of the first circular through hole and the first reference surface being L, a design distance between the central axis of the first circular through hole and the second reference surface being H, positional tolerances of the first circular through hole relative to the first reference surface and the second reference surface both being φx, the test device comprising:

• a base, the base comprising a first flat surface for contacting the second reference surface;
• a first positioning block mounted on the base, the first positioning block being configured for fixing the workpiece;
• a test pin, the test pin comprising a cylindrical rod and a conical part, the cylindrical rod being connected to a bottom surface of the conical part, the cylindrical rod and the conical part being coaxial, a diameter of the bottom surface being greater than a diameter of the first circular through hole, a diameter of the cylindrical rod being Dl, the conical part being configured for inserting into the first circular through hole;
• a floating support block coupled to the base, the floating support block being configured for supporting the test pin so that a central axis of the test pin is coincident with the central axis of the first circular through hole;
• and
• a standard design part positioned on the base, the standard design part comprising a third reference surface and a fourth reference surface perpendicular to the third reference surface, and defining a second circular through hole, a central axis of the second circular through hole being parallel to the third reference surface and the fourth reference surface, an actual distance between the central axis of the second circular through hole and the third reference surface being L, an actual distance between the central axis of the second circular through hole and the fourth reference surface being H, a diameter of the second circular through hole being D2, wherein D2=D1+φx, the fourth reference surface abuts the first flat surface of the base, the standard design part is capable of sliding on the first flat surface in such a manner that the third reference surface is kept coplanar with the first reference surface.