In daily work, we often encounter workpieces that cannot be processed by using the general formwork method. At this time, special clamping fixture must be used:

(1) for small workpieces, if the platen cannot be set up, consider using a square horn or stone for processing;

(2) if the workpiece with large gradient is unable to be tilted for machining, sinusoid table or bevel block should be adopted for machining;

(3) when multiple pieces are processed, the positive Angle or stone may be considered for overlapping processing;

(4) during the use of the jig, the jig shall not be damaged. (for example: it is not feasible to cut and hurt the jig for the convenience of formwork)