For Thread Verification and Thread Reconditioning Applications
Whether the application is thread verification of existing threads, or reconditioning deformed or impeded existing threads, it is essential that the correct toolholder be selected. In all cases the tool must follow the existing thread with as little impediment or resistance as possible. Ordinary floating tap holders, or rubber couplings are not suitable for these kinds of work; their use will result in stalling at entry, metal adhesions or out-of-phase rethreading. A properly designed compliant toolholder, will, in contrast, allow the tool to make effortless entry 100% of the time, and then permit the tool to glide easily through any correctly-sized thread.
As an example of a Compliant Toolholder in a real-life application: VFLX16 is a video of a 4-Spindle Unit inspection station. Its purpose is to thread-verify four M8 inserts in molded automotive pedal modules. It was originally built without New Visa componentry, but it was retrofitted in early 2017 with New Vista FLX Spindles and DDG Super-Compliant Toolholders. The application was challenging because the pedal modules might be hot, coming right off of the molding press; or they might instead be cold if recently removed from a cold warehouse. So the threaded holes are often not in predictable locations. The original builder of the inspection station tried rubber coupling devices to gain compliance, but entry problems emerged, resulting in too many false rejects. Retrofitting the station with New Vista DDGX2 Compliant Toolholders completely solved the problem: the tools now enter correctly every time and they then glide right through the thread.
Compliant Toolholders are not just for thread verification. They will carry a lot of torque, so they are well suited to thread chasing or re-tapping applications, as well. Contact your New Vista Applications Engineer to find out which Toolholder is best suited to your application.