Everything about Pilot Hole totally explained
A pilot hole is a smaller hole drilled into a material prior to a larger hole being drilled, widening the hole to the desired width. Drilling a pilot hole prevents a larger drill bit from slipping on the material - a potential safety hazard, as well as an increased likelihood of the work being damaged. Normally, a
centre punch is used before drilling the pilot hole to ensure that the smaller pilot
drill bit doesn't slip.
Pilot holes may also be used when driving a
screw. When a screw is driven into a material, it can act as a
wedge, generating outward pressure which can cause many materials (such as
wood or
plastic) to split. By drilling a small pilot hole into the material, into which a screw is then driven, less 'wedging' takes place, thereby reducing the likelihood of the material being split.
Pilot holes are used on a variety of materials including
wood and
plastics, though their use is especially essential when drilling into polished or smooth metal, as larger drill bits are very likely to slip on such materials.
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