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=====Description=====
The [http://en.wikipedia.org/wiki/Drill'''Power Drill'''] is the most popular and versatile of all power tools and most home toolkits will have at least one. With suitable attachments* they are capable of much more than simply drilling holes. Most modern drills have a [http://en.wikipedia.org/wiki/Chuck_%28engineering%29 '''Keyless Chuck'''] with a capacity up to 10mm or 13mm.


Originally designed as a [http://en.wikipedia.org/wiki/Drill#Pistol-grip_.28corded.29_drill'''Pistol Grip'''] mains electricity powered [http://en.wikipedia.org/wiki/Drill#Pistol-grip_.28corded.29_drill '''''(or corded)'''''] device, but battery powered [http://en.wikipedia.org/wiki/Drill#Cordless_drills '''''(or cordless)'''''] versions are becoming more common. They are more convenient and the tendency now is to use the same battery pack on different single-purpose machines rather than use power drill attachments. 18 Volt drills are the most common and, in general, the higher the voltage, the more powerful and useful the drill.

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<span style="color: green">'''*Note:'''
When using power tools in schools, battery powered, single purpose tools are preferred and the use of attachments avoided [http://shop.bsigroup.com/ProductDetail/?pid=000000000030270862''[Ref: BS 4163 2007]''].
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=====Features and Applications=====

[[File:HammerDrill.png|200px|right]]
Many '''Portable Electric Drills''' have some form of speed control ''(e.g. either a two-speed gearbox or an electronic variable speed control)'' and some have [http://en.wikipedia.org/wiki/Torque '''Torque Control'''] and [http://en.wikipedia.org/wiki/Clutch '''Clutch'''] with reverse, which can be helpful when driving in [[Woodscrews and Self-Tappers|woodscrews]] for example. Drills used for making holes in masonry often include a [http://en.wikipedia.org/wiki/Drill#Hammer_drill '''Hammer Action'''].  
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<span style="color: red">'''Safety Point!'''
The drill [http://en.wikipedia.org/wiki/Clutch '''Clutch'''] is designed to slip if too much [http://en.wikipedia.org/wiki/Torque '''Torque'''] is applied. This can help prevent screws breaking off but is most important when drilling large diameter holes in masonry ''(e.g. with a [http://en.wikipedia.org/wiki/Core_drill '''Core Drill'''])'' to prevent personal injury caused by the drill being twisted out of the user's hand.  
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[[File:SDSdrill.png|200px|right]]
[http://en.wikipedia.org/wiki/Drill_bit_shank#SDS_shank '''SDS Drill''']

Most power drills have chucks which accept [http://en.wikipedia.org/wiki/Drill_bit_shank#Straight_shank '''Parallel Shank'''] drill bits ''(also [http://en.wikipedia.org/wiki/Drill_bit_shank#Triangle_shank triangular] and [http://en.wikipedia.org/wiki/Drill_bit_shank#Hex_shank hexagonal])'' but some purpose-made and heavier duty [http://en.wikipedia.org/wiki/Drill#Rotary_hammer_drill '''Rotary Hammer Drills'''] have a chuck which is designed to have [http://en.wikipedia.org/wiki/Drill_bit_shank#SDS_shank '''SDS Shank'''] bits simply slotted in.


[http://en.wikipedia.org/wiki/Drill_bit_shank#SDS_shank '''SDS Drills'''] are commonly able to rotate as normal, rotate with hammer action, or apply hammer action without rotating.  For this reason, a range of '''[[Chisels|chisels]]''' and '''[[Chisels|bolsters]]''' are available as SDS tools, in addition to masonry drills.
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<span style="color: green">'''*Note:'''
The SDS bit was developed by [https://en.wikipedia.org/wiki/Hilti Hilti] and [https://en.wikipedia.org/wiki/Robert_Bosch_GmbH Bosch] in 1975. The name comes from the German: "'''S'''tecken – '''D'''rehen – '''S'''ichern" ''(Insert – Twist – Secure)'' but [https://en.wikipedia.org/wiki/Robert_Bosch_GmbH Bosch] marketing now uses "Special Direct System" for international purposes.
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{{Portable Electric Drills Buyers Guide}}

[[Category:Portable Power Tools]]
[[Category:Drilling and Boring]]