中文站
English
русский
Possible causes: motor stall, motor drive shaft card dead, or bit plugged blocked...
According to the vibration-knocking tool and structure ,is hydraulic and mechanical in terms of its structure....
· Difference of the thread structure (datum mark-All products); · Difference ofhardness test position (NS-1 increase full cross section hardness test-all products);...
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; ...
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...
