How to choose the correct top hammer drilling tools

The wide range of applications and drilling conditions

Suitable for down-the-hole (DTH) drilling tools. The pneumatic percussion technique requires consideration of more than one type of tool to drill efficiently and profitably. A variety of factors, from hammer size to determining whether or not an economy hammer represents the best value, all figure into the hammer’s overall cost of operation on a given job. Choose the correct top hammer drilling tools

Top hammer drilling is powered by intensive impact power produced by air or hydraulic pressure via a piston; the impact power is transmitted to the drill bit and finally into the rock via the shank adapter, coupling, and drill rod. Thanks to its high-impact-frequency feature, top hammer drilling offers high speed and high efficiency.

The selection of hammer size is largely determined

The hole diameter and type of rock formation. The optimum blasthole range for DTH drilling is 3 ½ to 10 in. Smaller holes are typically drilled with a top hammer rather than a DTH hammer, and larger holes generally use the rotary drilling technique, mainly with the focus on hole straightness.

As a general rule, the smallest hole diameter a DTH hammer can drill is its nominal size. A 4-in. hammer is optimally designed to drill a 4-in. hole. The closer the hole diameter is to the hammer’s diameter, the more restricted the hole’s evacuating airflow is. Drilling holes at the nominal size leaves adequate space for cuttings to evacuate the hole up the annulus between the hammer and drill pipe diameters and the internal diameter of the hole’s wall.

The maximum bit size for production

The maximum bit size for production drilling is the nominal hammer diameter plus 1 in. For instance, a 4-in. hammer’s maximum bit size is regarded to be 5 in. in diameter.

AME DRILL’s complete range of top hammer drilling tools is designed to suit drilling duties in various scenarios, including tunneling, construction, mining, quarrying, etc., with different types; drilling works on both soft and hard rocks can be performed perfectly. The AME DRILL top hammer drilling tools series includes drilling bits, shank adapters, couplings, and drill rods.

We offer complete pre-sale and after-sales services and support. Contact us for further help and information; we can offer you suitable drilling tools according to your specific needs.