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WORKSHOP EQUIPMENT - HAND DRILLS | ||
V. Ryan © 2001 - 2021 | ||
In the workshop you probably use a ‘hand drill’ and a
‘ratchet brace’ as part of practical work. These are used for drilling a
range of sizes of hole and they are very useful especially if machine drills
are not available. The hand drill generally holds drill sizes from 1mm to
9mm whilst the brace will hold larger drill bits called ‘forstner bits’ and
‘auger bits’. These larger bits can be used to drill ‘blind holes’ (holes
that do not go the entire way through material). When using these drills, always hold them so that they are vertical and turn the handles in a clockwise direction. The common mistake is to turn the handles anticlockwise as this makes it almost impossible to drill even the smallest holes. Also, put scrap material underneath the material to be drilled so that the bench is not damaged by the bit as it ‘bursts through the other side. |
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A TYPICAL HAND DRILL | ||
THE RATCHET BRACE | ||
The ratchet system can be set to allow rotation in either a clockwise or anticlockwise direction, depending pawl / lever / latch that meshes with the gear wheel. |
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The ratchet gear rotates in one direction. The pawl /lever / latch engages with the teeth and prevents the gear rotating in the opposite direction. | ||
SAFETY 1. Clamp down the work to be drilled. |
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QUESTIONS: 1. Draw a ratchet brace and hand drill and label the most
important parts. |
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CLICK HERE FOR HOW TO USE A HAND DRILL | ||
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