Is Robo Drilling Suitable for Hard Rock?

Most of Hyderabad and Secunderabad sits on hard rock. Many people worry that a small, neat machine cannot handle it.

That worry is fair. A robo rig looks smaller than the old big trucks. But small size does not mean weak drilling.

In this guide, we explain how a robo rig cuts rock, where it works well, and where it can struggle. We also share what to ask before you book.

What is hard rock in Hyderabad?

Under most Hyderabad plots, the ground is granite. Granite is very hard and strong rock.

Water is not stored in the rock itself. It sits in cracks and gaps inside the rock. A borewell works only if it meets these cracks.

The top layer is often soft soil or loose, broken rock. The hard rock starts below that. How deep it starts depends on your area and plot.

How robo drilling works in hard rock

Most robo rigs use a method called DTH. It means “down the hole”.

A strong hammer sits at the bottom of the drilling pipe. Air pressure makes it hit the rock again and again. The rock breaks into small pieces. Air then blows the pieces out.

This works well in hard rock. The hammer does the cutting, not just the weight of the machine.

The robo rig also stays steady on its tracks. This helps the pipe go down straight. You can read the basics in our guide on robo borewell drilling in Hyderabad.

Robo drilling vs normal drilling in hard rock

Both methods can drill hard rock. The big difference is the machine size and where it can go.

Many normal rigs also use a hammer. So hard rock is not the main reason to choose one over the other. Site space is often the bigger reason.

Swipe sideways to see the full table on your phone.

Actual results depend on the exact machine and the ground at your plot.

If you want a full side-by-side view, read our guide on which is better, robo or conventional drilling. For money questions, see the borewell drilling cost in Hyderabad page.

When robo drilling can be slower in hard rock

Robo drilling is suitable for hard rock. But some days the rock fights back. These are the usual reasons.

What about depth?

Robo rigs can drill deep in hard rock. But the exact depth depends on the machine and the ground.

Do not trust anyone who gives you a depth before seeing your plot. Hyderabad ground can change from one street to the next.

What about small plots and house walls?

This is where robo rigs help most. They can enter narrow gates and tight spaces. Your hard rock problem and your small plot problem can both be handled.

For houses, see our page on residential borewell drilling in Hyderabad.

What to ask before you book robo drilling for hard rock

Use this short list when you call any driller. It helps you avoid surprises.

• Which robo rig will you bring? Is it a DTH hammer rig?
• Have you drilled in hard rock areas near my locality?
• How is the charge worked out if the rock is very hard?
• What happens to the cost if we do not find water?
• Who arranges the casing pipe, and when is it used?

Also check the rules before you start. Our page on borewell permission in Hyderabad explains what to look at. For general groundwater facts in India, you can visit the Central Ground Water Board website.

Please note: Everything here is general guidance. Ground conditions, depth, time and cost change from site to site. Final answers come only after a site visit.

Common questions

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