Hammer drill
A hammer drill, also known as a percussion drill or impact drill, is a
Function
Hammer drills have a cam-action or percussion hammering mechanism, in which two sets of toothed gears mechanically interact with each other to hammer while rotating the drill bit. With cam-action drills, the chuck has a mechanism whereby the entire chuck and bit move forward and backward on the axis of rotation.
This type of drill is often used with or without the hammer action, but it is not possible to use the hammer action alone as it is the rotation over the cams which causes the hammer motion. A hammer drill has a specially designed clutch that allows it to not only spin the drill bit, but also to punch it in and out (along the axis of the bit).
The actual distance the bit travels in and out and the force of its blow are both very small, and the hammering action is very rapid—thousands of "BPM" (blows per minute)[3] or "IPM" (impacts per minute). Although each blow is of relatively low force, these thousands of blows per minute are more than adequate to break up concrete or brick, using the masonry drill bit's carbide wedge to pulverize it for the spiral flutes to whisk away.
For this reason, a hammer drill drills much faster than a regular drill through concrete, brick, and thick lumber. In standardized drilling speed tests, the most effective hammer drills improve drilling speeds by upwards of 30% compared to completing the same task with the hammer mode disabled.[4] Hammer drills are increasingly powered by cordless technology.
Use
Holes in hard materials are needed for
Hammer drills almost always have a lever or switch that locks off the special "hammer clutch," turning the tool into a conventional drill for wood or metal work. Hammer drills are more expensive and more bulky than regular drills, but are preferable for applications where the material to be drilled—concrete block or wood studs—is unknown. For example, an electrician mounting an electrical box to a wall would be able to use the same hammer drill to drill into either wood studs (hammer disabled) or masonry walls (hammer enabled).
History
The origin of the first hammer drill is a matter of contention. German company
Hand-cranked percussion drills were made in the UK in the mid-twentieth century.[15]
See also
- Drill
- Rotary hammer
- Volatiles Investigating Polar Exploration Roverwhich uses a hammer drill to excavate ice-bearing regolith
References
- Oxford Dictionaries. Oxford University Press. Archived from the originalon September 8, 2018. Retrieved September 8, 2018.
- ^ "Impact drill". DIY Knowledge. Archived from the original on September 8, 2018. Retrieved September 8, 2018.
- ^ "Cordless Hammer Driver Drill XPH11 Instruction Manual" (PDF). Makita. p. 2. Archived (PDF) from the original on 15 April 2018. Retrieved 15 April 2018.
Blows per minute. High (2): 0 - 25,500 /min; Low: 0 - 7,500 /min
- ^ "Drills Drilling Speed Test Results - DIY Gear Reviews". 2023-10-03. Retrieved 2023-10-23.
- ^ Akku Schlagbohrschrauber
- ISBN 978-0195168754.
- ISBN 978-0262195935.
- ^ Weissenbacher, Manfred (2009). Sources of Power: How Energy Forges Human History by Manfred Weissenbacher. Praeger. p. 362.
- ^ Iron in China
- ^ Han, Gang; Dusseault, Maurice B.; Detournay, Emmanuel; Thomson, Bradley J.; Zacny, Kris (2009). "2". Principles of Drilling and Excavation (PDF). Wiley (published August 31, 2009). p. 60. Archived from the original (PDF) on July 13, 2019.
- ^ "Cable Tool Drilling". Seismic Water Finder.
- ISBN 978-0135655320.
- ^ "Cable Tool Drilling". Seismic Water Finder.
- ^ "History of Milwaukee". Milwaukee Tool. Retrieved 17 February 2014.
- ^ "Hammer drill hand powered drill working example 70 yrs old!". YouTube.
External links
- NIOSH Sound Power and Vibrations Database Archived 2016-06-30 at the Wayback Machine
- New York City Quiet Vendor Guidelines Archived 2010-06-02 at the Wayback Machine