SDS (Special Direct System) Drills are extremely powerful and used when extra power is required, for heavy duty jobs. They have three basic functions that allow normal drilling, hammer action and chiselling. Furthermore, SDS Drills can hold large diameter drill bits well passed the 13mm diameter limit of normal drills. Professionals tend to select this type of drill for major projects.
However, SDS Drills tend to by heavy compared to ordinary drills which means they are unsuitable when working up a ladder or for small jobs such as light drilling - when a small power drill would be suffice.

1. The cord is carefully laid out so that it cannot trip the person using the drill.
2. It is good practice to use a circuit breaker. This will cut power if any electrical fault in the drill is detected.
3. Always wear safety goggles to protect the eyes. Never operate equipment like this without eye protection.
4. When using an SDS Drill hold both the normal handle and front handle securely. This will help steady the drill as it vibrates during use. It also allows the user to put pressure against the drill as it is used to drill holes in difficult materials.
5. The person using the drill should space their feet apart. This helps the person balance and lean into the drill, applying his/her weight safely.
6. Always check that electrical wires or water pipes are not in the area of intended drilling. Drilling through an electrical wire can be extremely dangerous.
7. Always seek instruction / training from an appropriately qualified instructor before using any tools, especially power tools.

A basic SDS Drill is shown below. Even basic drills are provided with necessary fitments such as a front handle. It is strongly recommended that the front handle is always fitted before use . SDS Drills should not be used in one hand, it should be firmly supported by both hands in order to take the weight. Adjustments to speed can be made by the speed control dial whilst ‘hammer’, ‘normal’ or ‘chisel action’ can be selected by altering the position of the lever at the top of the drill.

A range of chisels are supplied for SDS Drills. A typical chisel is shown opposite. The shaft is the part that locks into the chuck of the drill. The chisel point is ‘ground’ to a suitable angle (normally 60 degrees). This type of chisel could be used to ‘chip’ away concrete or stone.

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