Drilling with the TBH 1

General

In this article we briefly explain how to use the TBH 1 diamond drilling machine correctly to achieve clean drilling.

The TBH 1 is a drill that uses a special water adapter for wet drilling with diamond drill bits. Drilling with water is necessary to prevent damage to the drill bit due to overheating.

The water adapter on the TBH 1 is clamped into the machine's built-in 3-jaw drill chuck by default. It's important that the adapter sits firmly in the chuck and runs smoothly. Concentricity can be checked primarily at low speeds, for example, when the machine is running down. Concentricity is significantly influenced by the quality of the drill chuck. A special high-quality drill chuck can be retrofitted for improved concentricity.

Limits when drilling with the TBH 1

• max. drilling diameter: 12 mm
• Max. drilling depth of blind hole: approx. 10 to 12 mm
• Max. drilling depth: approx. 20 to 24 mm

For the adapter to work properly, it requires a sufficient water pressure of at least 3 bar. A connection to the domestic water line or a special pump is therefore essential.

For small drills under 2 mm, we recommend the highest speed of the machine is 4,500 rpm.

Structure of the drill

The drill bits are two-part, consisting of the drill bit itself and an ejector pin. This ejector pin prevents the drill bit from clogging during drilling.

Installing the drill

Before installing the drill bit into the adapter, check that the ejector pin allows water to flow into the drill bit. This can be checked by pushing the pin into the drill bit. A gap must be formed on each side of the stop. If this gap is missing, no water will enter the drill bit, which would otherwise be damaged during drilling. It is also important that the pin be slightly longer than the drill bit.

Once this has been checked, the drill can be screwed into the M4 thread of the adapter.

After screwing in the bit, check for concentricity. To do this, briefly turn on the machine. When turning off and the drill is running out, you can then easily check the concentricity visually.

Sharpening the drill

New drill bits, especially those that are no longer drilling very well, need to be sharpened. Use an aluminum oxide plate for this purpose. Drill into the plate several times to sharpen the drill bit.

Drilling blind holes

Preparing the stone

We recommend preparing the hole (grinding) to ensure the drill bit rests flat before drilling. After drilling, the stone can be finished by sanding.

Drill

Once the drill bit is sharpened, it runs smoothly, and sufficient water flows from the drill bit tip, you're ready to drill. Secure the stone firmly to a surface by hand or use a jig. Carefully guide the drill bit toward the stone using the lever. Drilling must be done very carefully, especially if the surface is sharply curved. This can cause the drill bit to slip and break. When drilling, water, including debris, should ooze out of the hole. If no debris is visible, then the drill bit is blunt; sharpen it. Don't drill the entire depth in one go, but relieve the pressure on the drill bit several times by pulling back on the lever. This rinses the drill bit and prevents it from clogging as easily. Smaller diameter drill bits are less stable than thicker ones and therefore break much more easily during drilling.

Drilling through holes

When drilling through holes, drill from both sides to prevent chipping of the stone. A counterpiece with a matching diameter is required for this purpose. The counterpiece is slightly smaller in diameter than the drill bit. The counterpiece is screwed into the magnetic base and must be centered relative to the drill bit. Furthermore, the height of the drill bit must also be adjusted. At the depth stop of the lever, there must be a small gap between the counterpiece and the drill bit.

Ending the drilling process

Turn off the machine and turn off the water supply. Refer to the machine's operating instructions.

This is a non-binding description of how we drill. We assume no liability for damages resulting from the information contained in this description.