Drilling through rock can be a challenging task, and choosing the right rock drill bit is crucial for success. There are many types of rock drill bits available, and each one is designed for a specific type of rock or drilling situation. In this article, we will explore the different types of rock drill bits and help you choose the best one for your drilling needs.
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Types of rock drill bits
Tapered drill bits
Tapered drill bits are conical in shape and are designed for drilling through hard rock formations. They have a tapered shape that allows them to penetrate deeper into the rock, and they are suitable for use with a hammer drill. Tapered drill bits are available in a variety of sizes and can be used for both surface and underground drilling.
Threaded drill bits
Threaded drill bits are designed for use with a rock drill machine and are threaded to fit into the machine's chuck. They come in a variety of sizes and are suitable for drilling through hard rock formations. Threaded drill bits are ideal for drilling deep holes, and they can be used for both surface and underground drilling.
Cross-type drill bits
Cross-type drill bits are designed for drilling through hard and abrasive rock formations. They have a chisel-shaped tip that is made from tungsten carbide and is highly resistant to wear and tear. Cross-type drill bits are suitable for use with a hammer drill and are ideal for drilling deep holes in hard rock.
Button-type drill bits
Button-type drill bits are designed for drilling through hard rock formations. They have carbide buttons on the tip that provides a high impact force and helps to break through the rock surface. Button-type drill bits are suitable for use with a hammer drill and are ideal for drilling shallow to medium-depth holes in hard rock.
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Choosing the best rock drill bit
Choosing the best rock drill bit depends on several factors, including the type of rock formation, the required drilling depth, and the diameter of the hole. Here are some tips to help you choose the best rock drill bit for your needs:
Consider the diameter of the hole
The diameter of the hole you need to drill will determine the diameter of rock drill bit you need.
Choose a high-quality drill bit
It's important to choose a rock drill bit that is made from high-quality materials and is designed for the specific type of drilling you need to do. A high-quality drill bit will last longer and provide better performance than a low-quality one.
Grab the Dremel and let's go.
The water traps all the rock dust so I don't always bother with a dust mask, but if you want to wear one, go ahead.
Starting with the burr almost vertical makes it much more prone to slipping out of position as there is no pilot hole yet. It's much easier to begin at a shallow angle to engrave a little pit, and raise to vertical once the hole is deep enough to keep the burr from wandering.
Once the burr is vertical, move it in very small circles (watch the video for a better visual on what I mean), and pretty much just keep on doing that. Some other how-tos on drilling stones I've seen suggest pulsing it up and down, but those were all for coring bits instead of engraving burrs, and in my own experiments I've found that a slight rotational wiggle does a faster job.
Pause every now and then to check the bore depth so you have some idea of how soon the burr will punch through the other side. Pressing too hard at the end could make it chip out the back, and/or punch through the bottom of the container, so back off a little on the pressure when you think you're getting close. There might be a very slight change in the sound or feel of the drill right before it breaks through.
The stone I drilled through for this is an opaque piece of black jasper, but if you've got a more translucent stone, you can check your progress from the reverse by shining a bright light through the stone. I have a small LED flashlight that does a good job at this, though sometimes just an overhead light will do if the stone is very translucent or the hole far enough through. Marking where the hole is and then drilling from the reverse to meet in the middle is a good way to prevent chip-out.
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