NC center drills 120°
NC Spot Drills 120 Degrees
The 120° specification is crucial when ordering your NC spot drills, as it indicates the drill’s tip angle. Another common size found in our range, which is also a standard in precision industrial manufacturing, is the 90-degree NC spot drill. The 120° NC spot drills, like the 90-degree variant, are available in both HSS and HSSE materials. For most standard applications, HSS NC spot drills at 120° are sufficient, but if you frequently need to spot drill high-strength metals or other challenging materials, the HSSE version with its 5% cobalt alloy may be a more durable choice. Ultimately, tool life and longevity depend on the intended use. If you’re unsure, our team is happy to provide expert, customer-oriented advice on the various options. This includes custom designs or special material requirements or coatings for your 120° NC spot drills.
Benefits of Using 120° NC Spot Drills
Pre-drilling holes is highly recommended in the production and large-scale manufacturing of various workpieces. Without this, scrap rates or limited-quality parts increase significantly. In NC and CNC-assisted manufacturing, NC spot drills have proven their value. They serve a similar purpose to center drills, which are also recommended for workshop and hobby applications. When using a professional milling machine, suitable boring mills, or NC machines, the centering tips found in traditional center drills are not required. Since these machines generally offer high geometric rigidity and stability during operation, NC spot drills are made without centering tips. When ordering, be sure to select the appropriate tip angle, as this greatly influences the stability and lateral guidance of the twist drill that will be used for the main drilling.
Why Use a 120° NC Spot Drill Before the Twist Drill
In principle, it’s possible to drill holes directly into the workpiece with a twist drill. However, wherever precision and speed are priorities, the production process should include the pre-drilling step. With modern milling machines and computer-controlled systems, this step adds minimal time but significantly increases precision. Without pre-drilling, twist drills may wander due to insufficient lateral guidance, leading to skewed holes or even slippage. Ultimately, using high-quality 120° NC spot drills saves time and money by reducing scrap rates. Please note that NC spot drills are not designed for drilling deep holes, as they lack both the necessary length and the guiding chamfer required in standard twist drills.