1. Benchmark: straight handle stepped bit structure is relatively simple, and in the assembly work under the condition of a larger diameter as the main positioning surface, which is based on a large diameter axis can not only meet the functional requirements, but also in the processing and inspection Analog benchmarks are relatively easy;

2. Dimensional accuracy: large and small diameter (D, d) of the dimensional accuracy of the aperture is obvious, if the drill diameter is too poor, then the hole must be processed. The process can be rough, fine grinding, to ensure that the grinding out of the drill diameter in the difference between the ideal;

3. Position accuracy: In order to avoid the aperture tolerance, grinding the drill bit should be based on the baseline axis for the positioning of the corresponding fixture to ensure that the process requirements;

4. Surface quality: Surface quality mainly refers to the surface layer of the drill surface, including surface roughness and surface hardness, if not meet the requirements, will affect the tool wear resistance, fatigue strength and corrosion resistance

We are good tools in Changzhou is a professional manufacturer of carbide ladder drill manufacturers, more products, please log on to our official website for more information.