fraisa.com 336 Technical notes regarding use of thread cutting tools Thread cutting with functional performance of the compensation chuck A satisfactory compensation function of the chuck must be guaranteed (no jamming). Otherwise, despite the chuck, the thread may be miscut or pitch errors can arise. The torque level of the compensation chuck must be selected according to the thread type and the work piece material. Programming of a too high RPM value can lead to problems. If a RPM is selected which cannot be reached (due to the inertia of the spindle), the result may be premature breakage of the tool or miscutting of the thread. A careful analysis often shows that high spindle speeds do not lead to overall significant time savings. Rigid Tapping Rigid tapping is designed for modern machines with synchronised spindle drives. All tools have a clamping flat and are used with conventional chucks. When using Rigid tapping, a sufficient approach distance must be programmed. If the distance is too small, the machine spindle may not be able to properly synchronize with the feed before entering the drillhole. This will result in a pitch error of the thread, even with synchronous working. For some machines, it is possible that the recommended spindle speed for synchronous operation cannot be reached. In these cases it is necessary to operate at the highest possible spindle speed where synchronism of the machine is still guaranteed. Thread cutting with functional performance of the compensation chuck or Rigid Tapping Thread cutting with micro-compensation or rigid tapping Modern CNC machine tools can synchronize the spindle speed and feed rate. Despite this, microscopic pitch errors can arise. These are compensated by micro-compensation or synchronous tapping attachments and facilitate better results in terms of tool life and quality.
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