Cordless drills / screw guns

Drills are used to make holes during car repairs. Their active element is a sharpened drill bit gripped by a chuck. It is capable to rotate at large number of revolutions per minute which makes it possible to bore holes quickly and carefully.

Screw guns help to mount and dismount threaded fasteners without wasting time and effort. A shaft is driven by an electric motor. It transfers rotation to the tips of the tool.

Types of drills

By drive type:

• Pneumatic. Need to be connected to a compressor that feeds compressed air. They allow to work faster than hand drills.
• Electric. Driven by a small motor. These are high-performance tools which help you to drill almost any material. They can be mains or battery powered. They vary according to the power of the motor: the higher it is, the more efficient and heavier the tool is.

There are items with a special design, for example:

• Angle. The chuck of these devices is at right angle to the body. This helps to make holes even in hard to reach places, under the bonnet, in particular.
• Multifunction. Thanks to their special design, these tools can be used both for drilling and fastening screws.

Types of screw guns

These tools can be powered by mains, battery or both. There are two main categories of the tools in the manufacturers catalogues. They vary according to rotational speed of the tip.

• Professional. Have a long service life, can withstand high loads. They can reach 1200 rpm. If such tool is powered by a battery, it doesn’t take more than 1–1.5 hours to charge it.
• Household. As a rule, they have light weight and affordable price. The shaft rotates at 500–800 revolutions per minute. Charging a battery of cordless tools can take up to several hours.

Drills: maintenance tips

1. You should wear safety glasses.
2. Always make sure that the drill bit seats tightly.
3. Use only finely sharpened drill bits, otherwise, it is possible to damage the surface.
4. Do not push on the body.
5. Before removing the drill bit, make sure it stopped rotating completely. But first, unplug the tool from the power supply.

Screw guns: maintenance tips

1. Change the speed mode only when the tool is switched off and the tip has stopped.
2. Use only the bits that are recommended by the manufacturer.
3. Avoid the contact between foreign objects and the rotating parts.

Professional help from Buycarparts.co.uk

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