Masonry Drill Bit. How Does a Masonry Drill Bit Work by Calvin Stephenson
Let's talk about bits used in a rotary hammer.
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 early 1960s Skil Corporation came out with their 726 736 Model rotary hammers. These revolutionized the job of making holes in masonry. They utilized a fluted bit with a carbide tip soldered into a slot at the end of the bit.
These bits had a twisted flute that ran the length of the bit a hex shank that fit down into the hammers allowing the driver to rotate the bit while drilling. This is very similar to the bits used today.
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 last part of the b it the drive end. It is either a hex shank a spline shank or an SDS type shank that enables the bit driver to turn the bit.
You are getting the most out of your hammer bits when the tip the flutes the shank are cutting extracting rotating accordingly.
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