How Does A Masonry Drill Bit Work by Calvin Stephenson
For the purpose of this article we will talk about bits that one would use in a rotary hammer when making holes in concrete or stone.
Drilling holes in stone masonry has been necessary for a long time. Up until mid twentieth century this was done with a hammer a star bit all by hand.
In the 1960's a revolution for masonry drilling was born with Skil Corporation's introduction of the 726 736 model rotary hammers. These models utilized a fluted bit with a carbide tip soldered into a slot at the tip.
The bits used in those early Skil rotary hammers are similar to the ones used today. They consisted of a very hard carbide tip. They had a twisted flute running the length of the bit. Also they had a hex shank that fit into the hammers so that the tool bit driver could rotate the bit while drilling.
The Carbide tip is what cuts the masonry with it's density. This type of tip works great for most materials with the exception of reinforced bars which is equally as hard.
The fluting or flutes on a b it what resemble a drill. They are not for drilling but for extracting the dust debris form hole as it being cut. One of the tricks to drilling faster making bits last longer is to back out of the hole while the hammer is still running. Do this every three inches or so it will pull out more dust. This makes it easier for the tip to cut lessens the amount of abrasive dust to wear out the bit.
The drive end is either a hex shank a spline shank or an SDS type shank that allows the bit driver to to turn the bit.
When the tip the flutes the shank are cutting extracting rotating like they are supposed to you are getting the most out of your hammer bits.
Calvin Stephenson is noted leader in stone tools equipment. stephensonequip. com Visit Stephenson Equipment stephensonequip. com for your tools equipment needs. How Does A Masonry Drill Bit Work
