Whether you are building a fence or putting up a flagpole or a bird house on a pole, you may find the need to dig a small diameter hole. Using a shovel for this job means making your hole larger than you need, so you may choose to use post hole diggers for the job instead. Here is how it is done. [pdf]
A down-the-hole drill, usually called DTH by most professionals, is basically a screwed on the bottom of a . The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or ). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuic. [pdf]
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