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· Difference of the thread structure (datum mark-All products); · Difference ofhardness test position (NS-1 increase full cross section hardness test-all products); ·Cold rolling requirements (the clear requirements of the thread and stress-r...
Anomaly 1: Pressure of gauge rises suddenly. Possible causes: motor stall, motor drive shaft card dead, or bit plugged blocked Methods of judgment and treatment:Motor stall:Rise the drilling tool 0.3-0.6m, checks the cyclic pressure, gradually a...
According to the vibration-knocking tool and structure ,is hydraulic and mechanical in terms of its structure. Their common features are: Can circulate the drilling fluid, the center must have the circulation drilling fluid the channel; Can ...
Normal drilling, with drilling shock device working time to meet the requirements below, should be recycled repair. Temperature above 190 ℃, work 240 hours; Temperature for (150~190) ℃, work 500 hours; 1.3 Temperature below 150 ℃, work ...
The diameter of the drilling device is worn out, and the outside diameter of the inner whorl is expanded larger than the following table, and shall be scrapped Specifications（MM）： ...
