Dental Direkt, a full-service provider of dental laboratory equipment, has added a shrinking and presetting solution from Haimer for manufacturing its dental prosthetic parts. Set-up for the company’s Swiss-type automatic lathes is now many times faster, leaving the machines free for more valuable machining time.

Machines on site include precision turning and milling machines, as well as eight Tornos Swiss-type automatic lathes from the Swiss GT 13 and GT 26 product series with bar feeders. The Tornos machines primarily produce high-precision laboratory and implant screws, titanium base bonds and individual abutments.

What was not so important with smaller quantities initially became significant due to growing demand for turned parts and their number of variants. The set-up times for Swiss-type automatic lathes were too long for economical production.

“We now handle 37 different implant connections, which reduces our batch sizes to only around 600-1000 parts, “states Jakob Röttger, head of technical sales. “On average, this means that we have to re-tool the machines every second day.”

Dental Direkt determined that the best way forward would be the purchase of a tool presetter, which allows the tools to be set outside of the machine tool and in turn, ensure it remains running. The firm put out a call for tender to various manufacturers but ultimately decided in favour of a solution from Haimer.

The suggestion by Haimer was to invest in its Microset UNO 20/40 tool presetting and Power Clamp Nano NG i4.0 shrink-fit solution.

This combination ensures the highest accuracy, as well as a rapid and reliable presetting process, saving approximately eight minutes per cutter when retooling on the machine.

Röttger says: “The Haimer system has made it possible for us to reduce our set-up times by 50%.”

For further information
www.haimer.biz

Unstable conditions and long overhangs often lead to vibration, poor thread surfaces and even fractures during thread-milling processes. With the TC630 Supreme orbital thread milling cutter, Walter is presenting the first solid-carbide thread milling cutter with DeVibe anti-vibration technology.

Incorporating an anti-vibration land on the flank face, the tool is stabilised during machining, thus suppressing vibration. The patent-pending DeVibe technology ensures excellent operational smoothness and enables usable lengths up to 4xDN, which is suitable for small threads, long overhangs, unstable conditions or difficult materials.

In these difficult areas of machining, creating and maintaining dimensional accuracy is also desirable which, according to Walter, is where the cutter’s overall design and geometry deliver results. With only one row of cutting edges engaged at a time, the design addresses tool deflection to ensure the thread remains cylindrical. The moderate number of teeth also enables a high feed per tooth, enhancing the wear resistance already created by the carefully selected cutter substrate and coating.

The Supreme milling cutter for blind-hole and through-hole threads has a broad application range that covers all ISO materials up to 48 HRc. Metric thread sizes from M1.6 to M20 are in the standard programme, while also in the range are cutters for metric fine pitch threads, UNC, UNF and STI UNF. The latter is primarily suited to aerospace applications.
With the TC630 Supreme, users can take advantage of a range of benefits, such as a high level of process security and reliability in unstable machining operations. This ensures its suitability for lathes with driven tools, long-overhang applications or instances where reliable chip removal is required – even in deeper thread applications where the optional internal coolant (from M5) applies.

For further information
www.walter-tools.com