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Wide range of spotting drills available in HSS or solid carbide.
Wide range of 90° spot drills available in HSS or Carbide, coated or uncoated
Wide range of 120° spot drills available in HSS or Carbide, coated or uncoated
Spot drills, commonly known as NC spot drills, are mainly used to drill an accurately positioned indention on a workpiece surface. The indentation acts as a guide and a reference point for non self centring drills, therefore using a spot drill will improve the overall accuracy of the finished hole. The design and substrate of NC spot drills vary, they typically feature a 90°, 120° or 142° drill point angle and are manufactured from HSS or carbide.
When choosing a spot drill, it’s important to select the correct drill point angle, this is key to achieving and maintaining the highest accuracy. The chosen point angle determines the contact area and depth of the initial indentation or spot, also serving as a precise reference point for the drilling operation. Using the correct point angle ensures that the centre of the drill bit makes the first contact with the workpiece, this will reduce the risk of chipping the drills cutting edge and eliminate the risk of deviations and improve overall precision.
Like many cutting tools, spot drills are available in HSS (high speed steel) and carbide, both having different benefits, please see advantages and disadvantages below.
Advantages:
Disadvantages:
Advantages:
Disadvantages:
NC spot drills can be used on various materials, the range of materials will depend on the spot drill substrate and coating. HSS (high speed steel) spot drills can be used on mild steel, alloy steel, tool steel, cast iron, non ferrous metals and plastics. It's important to note that while HSS is a versatile material, it may not be the best choice for extremely hard or abrasive materials. Carbide spot drills are better suited to drilling difficult to cut metals like stainless steels, titanium, steels up to 50 Rockwell and abrasive non ferrous metals. Having a coating on the spot drill will improve tool life and help protect against heat build up, whereas uncoated spot drills are better suited to drilling plastics and sticky materials like aluminium. Not having a coating prevents material build up on the cutting edge.
When selecting a spot drill for your application, it's important to consider several key factors to ensure optimal performance. The first thing to consider is the material you'll be working with, as different spot drills are designed for specific materials such as mild steel, alloy steels, cast iron, stainless steel and non-ferrous metals. The finished hole size is the next factor to consider as spot drills come in various sizes and with different drill point angles. The type of coating should also be considered, with options like TiN and TiAlN offering enhanced durability and heat resistance.
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