When it comes to renovation work in an apartment or house, 90% of the time you have to drill holes. Most often in the home environment there are welds, pipes or hardened metal products that need to be drilled. To perform the procedure qualitatively, you must have the appropriate tool with you. And for such cases, cob alt drills for metal will come in handy. Reviews about these tools are always positive and speak for themselves. In particular, we can say that these are powerful, wear-resistant, heat-resistant and reliable tools that will help the owner of the home to cope with the obstacle in a matter of minutes and complete the repair work faster.
What are these drills and what material are they made of
Cob alt drills are metal-cutting tools that are used to work with high-strength alloy steels and alloys with high degrees of toughness. But also such drilling tools provide stable and high hole accuracy, which greatly simplifies furtherwork with them.
They are made mainly of high speed steel with the addition of cob alt. The most popular cob alt drills for metal are R6M5K5, R9K10, VK6 and VK8.
Depending on the number after the letter designation of cob alt, you can find out what percentage of this hard metal is contained in the tool. For example, its content in high-speed tool steel R9K10 reaches almost 10%. Accordingly, there is less cob alt in the composition of R6M5K5 and VK6.
Application field for cob alt drilling tools
When you need to drill multiple holes in sticky materials or hard alloys like copper or stainless steel, cob alt metal drills are great for this. Practice shows that these tools are well suited for the job:
- with heat and acid resistant steels;
- with steel molds;
- with corrosion-resistant metals;
- with alloys.
In addition, cob alt metal drills can be useful not only at home, but also in production conditions for drilling cast iron, as well as for quickly and accurately making holes in other steels and alloys on metal cutting machines.
Advantages of cob alt drills
As noted earlier, the main advantages of these tools are high wear resistance and heat resistance. In other words, cob alt drills will last longer in everyday life, as they are less susceptible tomechanical damage and hold well at high melting temperatures.
In addition, the advantages and features of these drilling tools also include:
- Large sharpening angle (about 135°) which is great for drilling round and smooth surfaces.
- Special design that allows accurate and accurate drilling of large holes without additional tools.
- Ground flute for fast chip evacuation.
- Reinforced shank, which minimizes the possibility of breakage, and thus increases the service life.
- The presence of cob alt in the composition of the tool, which allows you to drill tough metals such as aluminum, lead, copper or tin.
Features of using cob alt drills
Before you drill a hole, you need to consider:
- The quality of the metal to be drilled. As already known, cob alt drills are recommended only for high-strength alloy steels and alloys with high degrees of toughness. In other situations, you need to select another tool.
- Hole diameter. Depending on the intended hole size, it is necessary to buy the most suitable cob alt drill bits for metal. For example, to drill a hole with a diameter of 9 mm, you need to purchase a drill with a diameter of 8.6 mm or 8.4 mm, since due to the impact force of the tool, the hole is requiredincrease.
- Depth of required hole. If, for example, it will be drilled under the dowel, then you need to compare its length with the size of the drill and select a tool 2-3 mm larger.
- Equipment used for drilling, such as a rotary hammer or drill. It is worth remembering that these two devices are fundamentally different. For example, drill shanks will be different for a hammer drill and a drill. And finally, the hammer drill is more for chiselling, while the drill is only suitable for drilling.
- The surface to be processed. A cob alt drill is great for round or smooth metal surfaces, but is unlikely to be as effective on a flat surface with a high level of roughness.
Drilling Features
To extend the life of any tool, including drills, you need to follow some rules. For example, it is not recommended to use cob alt drills at high speeds, especially when removing chips from a hole. This will help prevent jamming and tool breakage.
If the drilling procedure is long, it is necessary to prevent the tool from overheating. To do this, it is recommended to water it with oleic acid or take short breaks.
