What is a two center drill? What's the function?
There are two drill centers, one for passing through the bushing and one for reaming the center of diameter (the center line coincides with the center of the drill string)
The drill has two centers in the axial direction, generally used for reaming and used in salt gypsum layers, mainly to make drilling tools easy to pass through.
There are two drill centers, one for passing through the casing and one for enlarging the diameterHey！ I can't help it! Specializing in the production of mine accessories. Cutter, cutter, drill bits, diamond mine anchor drill, cross wind drill, spiral drill pipe, anchor, mining machinery fittings, rock drilling tools
