The variety of factors that you need to decide is primarily the type of aterial you are drilling and its various properties. These properties can be the hardness of the material, the cost of the material being drilled as well as the thickness of the material. The thickness the material the more pressure and coolant you would need. That means the more specific kind of diamond drill bit you would need.

The factor which is important is the drilling tool to be used and there are a variety of drilling tools available like the hand held drill or the drill press or the CNC drills.

Another thing is the frequency of use. That frequency may determine how much amount you are willing to spend. For example if you are using it very often the electroplate bonded diamond drill bit if fine with you but if you are using it more regularly then the best option is the sintered one. Though the sintered ones are costly but over the lifetime of the use they may prove to less expensive.

The other factor to consider is what the intended use of the hole is. That means whether you need a core or a plug or a proper hole and that in turn determine the kind drill bit you will use.

Based on the above factors you can actually do a cost versus the usage comparison to come up with a proper solution for your needs.

Diamond is a hard material which is used nowadays in the industry for drilling holes into the hard materials I mentioned above. The diamond drill bits have diamond on the tip of the drill bit either sintered or bonded. Here is my step by step guide to use the diamond drill bits which will help reduce the damage to the drill bits thereby reducing your cost of procurement of these drill bits.

Now two things, which we will focus on while we learn how to use is the speed of the drilling tool and the other is preventing heat from damaging the tool.

Diamond drill bits are always to be used at slower speeds as fast speed can damage them and also generate more heat. The optimal speeds are 700-1000RPM.The speed can vary based on the overall diameter for example for 6mm you may have the speed at max 2000 RPM.

The next important step is to keep the drill bits cool by use of water. The water will help the drill bit being cooler while the drilling action is going on and also remove the debris of the drilling action as well as help in lubrication. Try using the washing up bottle or any other mechanism to pour water directly onto the surface being drilled.

Slowly and steady wins the game and that applies to your drilling action. Start slowly, tilt the drill bit to scrape the surface a bit and then do the drilling action in a more vertical fashion. The best is to
have template or support on top of the surface being drilled as that will help you prevent from slipping and will gain more strong hold onto the drilling action.

Lastly use gentle pressure to drill and then do a repeatable action of drilling a bit and then taking out the drill and let water do its lubrication. Repeat this process till you find that you have completed
the process and drilled a proper hole.

The way it works is that it creates a hole is that the drill bit is actually hollow from the center and hence when you drill it will create a hole which the size of the drill. The size varies from 5/64″ to 4″.
The size of the shaft has to be a standard is 3/8″ so that it can be used in the drill.

However, if you are looking for some special purpose diamond drill bit for example say drilling hole into glass then the diamond drill bit needs to be a bit blunt from the front. The other thing is that they
will operate more slowly than the regular diamond core drill bit. The blunt diamond drill bits have diamonds on the tip and on the side whereas in a core drill the diamonds are at the sides since they do not have a tip.
The way the diamonds are attached to the tip is in two ways one is sintered and the other is bonding. In bonding the diamonds are attached to the drill tip using the electroplating bonding process.

The diamond drill bits as a matter of precaution or rather rule should only be used with very slow drills so that the impact of high drills does not destroy the drill bit or the material. The other important thing to know is that the drill pressure has to be very low too when
using the diamond drill bits.

The drill bits for use any drilling need to be hard enough to withstand the enormous of heat generated while drilling and the type of construction material used depends on the kind of material being drilled
into.

The most common material used for making the drill bits is steel. The type of steel used in the construction can vary based again on the usage of the drill bit. Soft low carbon steels are used as a material when we need to drill hole into wood. This is the most common type of drill
material and less expensive. The other steels used are the high carbon steels and high speed steels. The major benefit over other type of steels is that these can withstand heat better. The other common type is cobalt steel since it can retain it’s hardness at high temperature.

The next material which is being used nowadays is the tungsten carbide steel. This material is very hard and can be used in almost all the situations but since it is costly, pieces of  it are wither either
screwed or brazed on the drill bit. The other material used is PCD or poly crystalline diamond which is very very hard and can be used for almost any type of drilling work.

The next thing is that is done for the drill bits is coatings. The coatings again are done based on the use of the material being drilled. For the diamond drill bit the diamond powder is used as an abrasive for cutting stone, tile and other materials. The diamond coated bits generate large amount of heat and have to be cooled during their use.

There are various types of drill bits available in the market which can vary by the design of the cutter or the size of the cutter. The other end of the drill bit which is used for inserting it into the drill is
known as shank.

The most widely used type of drill is the twist drill used for drilling holes in metal, plastic or wood. The other most common types are the gun drills, or the center drills. The Center drills are used for providing a starting hole for a larger sized drill. There are other varities of drills which are specifically used for metal drilling.

The other drill bit which is common is the core drill bit which is used to enlarge an existing hole. The name may be confusing for the core drill bit a bit because it was named so since it was used for drilling a hole in a foundry core.

A diamond core drill bit is used for cutting a cylindrical core, cutting an annulus in the work piece and the diamond drill bit is cylindrical.

The diamond core drill though similar to reamers are different in a way that they can actually make an existing hole to almost double the size, if needed whereas reamers shave off only .1 millimeter to a maximum of one millimeter.

The other types of drills for use are masonry drills, diamond bit, well drilling etc.