Core drill rig use

Core drilling is a method of drilling that involves using a special drill bit and drill to remove a cylindrical core of material. This technique is often used in construction and other industries to create holes. [pdf]

How to use a Chinese handheld rock drill

When using a hand held rock drill, it's important to follow the manufacturer's instructions carefully. This includes using the right drill bit for the type of rock you're working with, as well as following the recommended drilling speed and pressure. [pdf]

Correct method of wiring two screw air compressors

To connect two compressors in parallel, follow these steps: Make sure both compressors have the same voltage and phase. Install a check valve on each compressor’s discharge line to prevent backflow. Install a tee fitting on each compressor’s discharge line. Connect the two tee fittings with a pipe.. To connect two compressors in parallel, follow these steps: Make sure both compressors have the same voltage and phase. Install a check valve on each compressor’s discharge line to prevent backflow. Install a tee fitting on each compressor’s discharge line. Connect the two tee fittings with a pipe.. The Short Answer: The basic process involves setting up a single pressure switch system linking both compressors, using a check valve to prevent air backflow, and using suitable hoses or pipes. [pdf]