During the standard shaving processes, the workpiece and cutter rotate together as a pair of helical gears with crossed axes. The shaving cutter receives the motion from the motor and drives the workpiece which is coupled onto a shaft moving freely. The meshing is free and this is the main reason why indexing errors are not easy to improve. The reasons why axes are crossed is to create an action of reciprocal sliding between the cutter teeth flank and the gear tooth. Let’s imagine the cutter prolonged along its axes in such a way to form a cylinder; if b axes were free to move, the wheel cou ..read more

Nowadays, cable television refers to any system that distributes signals through coaxial or fiber optic cables. Cable television was used in the USA in the late 40s to improve reception of commercial network broadcasts. Since then, there has been a proliferation of cable television systems offering special services. Cable system bandwidth has increased with the increase of the program options. As technology progressed with fiber optics and analog to digital conversion, quality and feature improved. Coaxial cables can carry many different channels into homes on a single RG-6 coaxial feed. Howev ..read more

The INNOHob™ tools feature a cutting edge whose design has been optimised for customer application. To this end, Samputensili technology specialists analyse the customer’s hobbing processes, evaluating component and tool geometry. Depending on the hobbing machine used, experts recommend process parameters that shorten machining time while extending tool life. Process knowledge enables them to calculate the loads occurring in the hobbing process and recommend the ideal cutting edge radii for each combination of chip thickness and cutting speed. The recommended cutting edges are then achi ..read more

All tool manufacturers are hard-pressed to meet the increasing market demand for higher accuracy, better efficiency and shorter lead times combined with price pressure. Manufacturers of precision tools are faced with these issues on a daily basis. As a manufacturer of gear cutting tools, Samputensili has been dealing with this challenge in the manufacturing of gear hobs for 70 years and knows that, in this respect, the choice of raw materials suppliers is fundamental. In order to combine the right materials to build a product that best meets customer requirements, a tool manufacturer needs t ..read more

The machine’s wheel spindle installed in Bonfiglioli is the 20,000 rpm high-speed version, while the work spindle has a maximum rotation speed of 1,500 rpm. The combination of the two motors, alongside the processing with a worm wheel, allows for a good number of starts. The replacement of the worm wheel is simple and quick because the fitting is based on an HSK 63 connection. This connection ensures the repeatability and quality of the fastening, also because the grinding process has recently become more forceful on the workpiece, with significant power and torque values involved. The HSK c ..read more

The size change-over time influences the number of batches that the machine can deal with in a productive and cost-effective way. The shorter these times, the fewer the minimum batches and, therefore, the overall flexibility of the plant. The presence of the dresser increases the flexibility of use, allowing very frequent size change-over: change within a short time (a few minutes) is another of the fundamental criteria required by Bonfiglioli to maximise the machine’s productivity. Notwithstanding the fact that a large batch is always preferable to small batches and those repeated periodica ..read more

The model discussed in this article is installed in Bonfiglioli, an Italian multinational company that, in its business units (Power Transmission Solutions, Mechatronic Drives & Solutions, and Mobile & Wind Solutions) offers know-how and experience for the development of its customers within increasingly competitive markets. The choice of the G 250 HS is part of this quest: quality of the workpieces made, reliability and productivity are some of the constraints that Bonfiglioli has imposed in its choice of the machine. The first eye-catching detail of the G 250 HS is the workpiece lo ..read more

Samputensili’s motto encapsulates exactly what it has to offer the world of gear machining: “Beyond precision”. In fact, both grinding machines and shaving machines produced by the company in Bologna allow high quality results to be obtained on different types of gears. Within the field of grinding, the company offers a series of high-performance solutions diversified by the characteristics, dimensions and type of machined workpieces. The G 250 is a grinding machine capable of working with gears of a maximum diameter of 250 mm and shafts with a length of up to 550 mm. In its HS (High Speed ..read more