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Due to the nature of the very forceful impact of the hammer on the star drill, there is likely to be some metal fatigue leading to the shaft of the star drill becoming uneven or bent, so by rotating it one is able to compensate this uneven stressing on the drill, hereby prolonging the life of the drill due to it remaining straight and true. You rotate the star drill after each blow of the hammer to release the broken debris that has broken off from the last hammer blow. If continuously hitting without turning, the debris would be impacted in the hole and the surface cutting edges on the star drill would not reach a new cutting surface. This is why a hammer drill will hammer and turn at the same time allowing a fresh cutting surface to appear while removing the broken debris.

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βˆ™ 15y ago
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βˆ™ 6mo ago

Rotating the star drill after each blow helps to ensure that the hole being drilled remains round and consistent in size. This technique also helps prevent the drill head from becoming jammed or stuck in the hole.

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βˆ™ 4y ago

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Q: Why should you rotate the star drill after each blow of the hammer?
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What is the difference between rotary drill and hammer drill?

The hammer drill vibrates in and out very fast to make masonry drilling much easier. Rotary hammers are drills with a piston on the inside which is operated by the motor and gears. When the motor turns, it moves a gear, which then moves a rod. The rod hits a hammer mechanism which transfers the strike force into the rotary hammer bit. All of this happens very rapidly. Because there is a piston being struck, the force of the blow against the bit is much harder than that of a hammer drill. Hammer drills have a motor that turns a splined gear type mechanism inside the tool. These splined gears are meshed together and hit against each other creating a vibrating action that is transferred to the drill chuck and bit. The hammering is rapid, but the force is only a fraction of that delivered by a rotary hammer. The primary use for the rotary hammer is to drill holes (from 1/4" to 2" in diameter) in hard concrete using a solid bit. It's also used for light chipping. The primary use for the hammer drill is to drill holes (from 3/16" to 7/8" in diameter) in masonry or brick. It's also used as a heavy-duty drill motor for standard drilling. Typically, a hammer drill has a chuck and uses bits that have straight shanks. Most rotary hammers use bits that have either slots and grooves in the shank (SDS) or spline shanks. Also becoming popular is a slotted shank bit called the "SDS-Max" which is for larger hammers. There is a major difference between a standard hammer drill and a rotary hammer drill. A standard hammer-drill uses 2 grooved plates that rotate opposite of each other; when they slip and the grooves connect, a bang is heard, "hammering" the chuck in and out, allowing a carbide bit to go through masonry materials. This method generates quite a bit of noise and often requires hearing protection. A rotary hammer is extremely more efficient than a regular hammer drill, because it drives a piston that compresses an air pocket, that, in turn, pounds the chuck with measurable impact energy. There really is no question which is better and faster. Rotary hammer drills do the same job in far less time, with less noise and with less effort. For many applications, like drilling into tough materials like aged concrete, a rotary hammer is the only tool to use.


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