When it comes to
drilling holes into materials like ceramics, tile, marble, granite, and other
hard materials, core bits are the absolute way to go. A core bit is hollow, and,
depends on the manufacturer, can be really strong. The good ones can create a
perfect circle, forming a hole. Because diamond is the hardest material there
is, diamond core bit makes for a great choice in drilling a hole. Normally,
core bits are sold alongside different cutting tools.
If not used properly,
a diamond core bit can overheat and can get heat fracture that may result to
breakage. Bear in mind that when properly used a core bit should just be warm.
Otherwise when it gets hot, it means that the drill speed is fast, or the
material being drilled cannot take the pressure, or there is not enough
lubrication.
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| Image Credit: flickr |
Here are the basics on the main drilling techniques that you should study before getting your hands on a core bit.
Drill Speed
Because all core
bits aren’t equal, this one hugely depends on the power tools manufacturer. There are types
that are used at slow speeds and decreases even further for harder and more
abrasive materials. On the larger bits, the RPM (revolutions per minute) should
be decreased. In prolonging the life of core bits, you should be able to
consider low pressure, sufficient water for lubrication and the correct drill
speeds.
Drill Pressure
If you increase the pressure on
the softer materials, the drill will get faster. As for harder materials, the
pressure should be decreased. Just let the core bit do its thing, so to speak.
If this isn’t followed, the core bit may get damaged. Light to medium pressure
is advisable.
Lubrication
Any expert will tell you that water should be
used to lubricate the tip, and of course, any coolant to cool it down. Water is
in fact the best used lubricant because it is most efficient aside from the
fact that it is readily available.
What lubrication does is it makes for a decreased
heat buildup, so it helps prolong the life of the core bit. Without question,
the importance of lubrication can never be overstated. It is something you
would never want to overlook. This holds true most especially if you are using
a diamond core bit. There are different methods of lubrication, and this I will
discuss in one of my future blogs.
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