Straightener what purposes? We all know that large-scale use of shaft, rod type parts in the machinery, automotive, electrical, military and other industries, these parts or materials in the rough heat treatment process will inevitably arise bending, if not treated or straightening Alignment accuracy can not be met, it will directly affect the subsequent processing and use of the workpiece, or there will be a considerable amount of scrap. In order to obtain the minimum amount of cutting allowable under the procedures, or by precision alignment to ensure the final piece to meet strict design tolerances, straightening machine the workpiece after heat treatment became indispensable key equipment. 1. Runout (tolerance) at opposite ends of the workpiece measurement point measuring the degree of bending benchmarks. 2. Straightness of the workpiece relative to the reference plane of the degree of bending 3. Roundness error processing the workpiece roundness index 4. Pushing amount correction indenter workpiece alignment from the workpiece when exposed to complete the process of correcting the displacement of the indenter decline. 5. High compensation amount by a certain amount of compensation is set so that the workpiece stops at the point of maximum bending upward position.