How do you start a rock drill?

Safety and operating instructions RD 100 Starting the rock drill Stopping the rock drill ◆ 1. Check that the drill steel and drill bit are in good Pull the throttle lever (B) backwards. This stops condition and properly attached to the rock drill.

What type of drill do hard rock miners use?

In general, hard rock miners use top hammer drills for holes less than 4 inches (150mm) in diameter, and ITH drills for larger holes. Miners still use blade bits (chisel or cross) for drilling small diameter blastholes in hard rock; button bits are normally more economical in the larger diameters.

How deep can a rock driling hole be drilled?

depths generally do not exceed 100 feet. The cuttings from rock driling generally make good stemming material. Compressed air is used to flush these cuttings from the hole. Drillng is frequently the most expensive operation in a surface mine. The cost justifies careful study and experiment to determine the most effcient hole diameter, spacing and

How do Arctic mines drill?

One arctic mine employs dry drilling underground. Efforts to duplicate the system elsewhere have so far been thwarted, mainly because of silica content in the ore. The V-cut, also called “wedge,” “cone,” and “pyramid,” is typically drilled at an inclination of 30 degrees from the drive axis.

What type of drilling is required for a blasthole?

Percussion drilling is required for drilling blastholes in rocks with a hardness of 4 or greater on the Mohs’ scale (refer to Chapter 1). These are mainly the volcanic rocks. Rotary drilling is satisfactory for softer rocks, mainly sedimentary. Source: Dr. Gary Hemphill The number of drill holes required in a lateral heading, N = Area/5 +16.

What is a rock drill used for?

mainly used in underground coal mining and earthworks. It can be used to drill horizontal or sloping blast hol s on medium and hard stone and bolt holes on the roof. The diameter o ir-leg and Hand-held Rock DrillsHand-held Rock DrillsBlack Diamond Drilling manuf