Using power above this level in reinforced concrete produced only minor increases in Penetration Rate. Hence producing lower unit pressure on drilling surface. In non reinforced concrete, penetration rate continued to increase at highest power used 7 HP, with only gradual decrease in drilling ration. Differences in horsepower and diamond core bit feed rates results in a different combination of diamond core bit life.
There is an ideal horsepower of each diamond core bit and material combination. The ideal horsepower would be at the point where the sum of the costs associated with diamond core bit life and operating costs are at the lowest point. In order to determine the optimum horsepower for the three different size diamond core bits used in this experiment, an equation was derived to determine drilling cost rate as a function of Penetration Rate PR and Drilling Ration DR. DR x Segment Height. We will use the equation to determine the cost of drilling for the three different diamond core bit sizes tested in this experiment for both reinforced and non reinforced concrete.
As you can see there is an optimum horsepower for each combination of diamond core bit diameter and material. Optimum horsepower can be determined where sum of the Diamond core Bit cost and Operating Cost are at a minimum. Conditions used in this experiment resulted in the following optimum drilling horsepower. As this experiment shows the optimum horsepower level for reinforced concrete is lower than for non reinforced concrete Knowing as much as possible about the material to be drilled and relaying this information to diamond core bit manufacturer is important to obtain the right diamond core bit for your application.
Before we can recommend the right diamond core bit for your application, knowing what type of aggregate that is to be drilled as well as whether reinforcing steel will be present and maximum drilling depth. Some concrete and allied materials are harder than others. Hence more difficult and longer to drill. For example: Limestone, slag and coral aggregate are relatively soft and abrasive materials. These are easily drilled with very fast drilled speed.
Cutting drill costs
On other hand concrete with river gravel or quartzite is of medium difficult to drill. Flint or granite aggregate is generally considered among the most difficult to drill. The size of aggregate can also play a factor in overall drilling performance of diamond core bit. In addition to the aggregate the type of sand used to make the concrete can influence the selection of diamond core bit. Many natural sands are quartzitic and have been rolled by water for many years and are smooth and dull. Similarly, manufactured sand usually has sharp and abrasive edges that can wear a diamond core bit bond very quickly.
Drilling concrete made with hard aggregates also requires more power. If there is not enough power, diamond core bit speed should be reduced. Diamond Bits used to drill hard aggregates should have segments with tough diamonds and a soft metal bond matrix. Otherwise the diamond particles will wear even with the bond surface and the diamond bit glazes over and is unable to drill. At same time segments for drilling soft aggregates should have hard diamond bond, so that diamond particles are not lost before their drilling life is consumed.
Green concrete is usually very abrasive and requires hard diamond bond. Drilling reinforced concrete is more difficult, takes longer, and costs more than almost any other concrete and allied material. Drilling Speed RPM. Optimum operating speeds for drilling concrete are around 10, surface feet per minute. It is important for the operator to maintain appropriate operating conditions to maximize diamond core bit life, drilling speed and overall performance.
Actual drilling speed will usually have to be adjusted to accommodate the aggregate type and amount of steel encountered in concrete being drilled. Usually higher drilling speeds make the diamond core bit act harder and often lengthen diamond core bit life. The trade off is slower drilling speed.
Decreasing diamond core bit speed will make the diamond bit act softer, but diamond core bit life will also decrease. Start in the lower RPM range, and once the diamond core bit is working well, increase the speed to optimize drilling life. When drilling softer abrasive materials, a faster drilling speed and forward traverse rate and more coolant should be used. Amount of power available to diamond core bit being used is also another important variable to consider in optimizing your concrete diamond drilling application.
Drilling Machine will less power than required can result in diamond core bits that will glaze over, resulting in slow drilling speeds. Drilling machine power requirements for typical concrete drilling operations is 2 to 20 horsepower.
Diamond drill bits for core drilling | Husqvarna Construction Products
In order for diamond core bit manufacturer to provide best diamond bit for your application, it is important to know the maximum horsepower of the drilling machine used. Delleur 12 December December Popular Science : — Geotechnical engineering. Offshore geotechnical engineering.
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Usually delivered in days? ExcelImpex 3. Core Bits with metal bond technology are built for long life and performance. Drill marble, granite, concrete, ceramic, tiles and number of hard and brittle materials.
Wear rate is less comparing to bits with electro-bond process. Industrial diamond grit is embedded into the tip of the bit by sintering. Drill through hard materials producing clean and accurate holes.
Download PDF Diamond Drilling How to Reduce Corebit Costs
However life of the Drill bit depends on hardness and thickness of the material being drilled. The diamond particles may wear after a prolonged use and due to friction caused by the extreme hardness of the material being drilled. M Inner Thread Core Bits are intended to use with all universal angle grinders.