pesmedia.com Production Engineering Solutions July 2024 27 TOOLING & WORKHOLDING Tooling specialist Arno has introduced a series of tool holders for back working on Swiss-type auto lathes. The range includes fixed holders for Star and Citizen machines with a Y2 axis and height adjustable holders for machines without, with both systems offering adjustable through coolant supply direct to the point of cut. “Our new height adjustable holders for back working have a number of features that other conventional systems lack,” explains Werner Meditz, head of technology at Arno Werkzeuge. “The height-adjustable holders for machines without a Y2 axis can be finely pre-adjusted offmachine using an adjustment device. The system consists of a basic holder, spacer plate, top holder and coolant supply attachment. The basic holder is precision clamped and fixed by a dovetail guide which increases stability and prevents chip build-up. “The tool length is also adjustable by means of a spacer plate – it is simply pushed over the shank of the basic holder. The top holder and coolant supply attachment can each be firmly connected by a simple clamping fixture and secured with just one screw. When the top holder is changed, the centre height setting is retained which ensures outstanding repeat accuracy and offers incredible time advantages,” he adds. The system with the heightadjustable basic holders is optimally designed. The optional coolant supply attachment with adjustable high-pressure jets delivers coolant directly to the tool cutting edge. All holders offer insert pockets with carbide shims to ensure a long-life insert seat. The centre height setting of the fixed holders with tools for machines with a Y2 axis is changed by the adjustable axis. These holders for Star and Citizen machines are designed in collaboration with the manufacturers to ensure optimum dimensional control and are therefore very compact. Combined with their fastening by two screws on the front and on the shaft diameter, these holders promise high stability. The through tool coolant supply can be connected from either side and the coolant jets are adjustable. The holders can also be fitted ‘overhead’ to optimise chip fall. All holders offer insert pockets with carbide shims to protect the insert seat. For Star machines, the manufacturer offers a short and a long version of the holders for turning with positive ISO indexable inserts. Holders are also available for both machine types for threading with ER16-ISO inserts, for grooving with Arno TE14 inserts and for boring bar holders with diameters of 6-16mm. In addition, the range includes D20 combination holders to install Arno clamping inserts to suit the patented Arno AMS mini boring system. They also allow drilling with collet holders ER16 or ER 20 which have through tool coolant supply. A wide range of coolant accessories – including coolant distributors, hoses, connectors, quick-release couplings, swivel fittings, jets, and coolant attachments – make it easier to use high-pressure coolant to the tools. This allows turning experts to take advantage of the full range of cooling benefits on Swiss-type auto lathes. Here, too, Arno Werkzeuge provides simple solutions and demonstrates its extensive experience by analysing the individual requirements of users – especially when skilled labour is becoming increasingly difficult to find for production. n Arno www.arno.de/en/ Fast and stable back working tool holders from Arno Cutting tool manufacturer Horn has introduced a mill with indexable inserts for machining external straight or involute splines on power take-off (PTO) shafts. They are used for transferring power from the engine of a tractor, via a secondary output on the transmission, to attachments that do not have their own drive, such as a mower or trailer. A stub shaft with a matching internal spline protruding from the tractor’s gearbox connects axially with the PTO shaft’s external spline to effect power transmission to the attachment. Horn’s new, high performance tool programme is designed to mill splines on a variety of PTO shafts, including those with standard diameters of 13 /8 and 13 /4 inches. Special milling cutters are available for restricted shaft clearances. The M274 tool holders have an internal coolant supply and 10 double-edged S274 carbide inserts are used. Tool diameter is 63mm. Horn Cutting Tools www.phorn.co.uk Yamawa expands Z-PRO VU tap series The Z-PRO VU series of taps from Japanese company Yamawa is especially designed for use with water-soluble cutting fluid and represents the optimum solution for tapping on high performance machining centres. Recently, the company has broadened the range of the VU series with new products and sizes. Yamawa is among the world leaders in threading tools manufacturing. Its monthly production of 1,200,000 taps is entirely carried out in four high-specialised plants located in Japan and each tool undergoes three strict quality control processes. Yamawa pursues quality in every detail and continuous investment in R&D provides the marketplace with state-of-the-art tools that perform excellently during the whole life cycle of the product. As part of Yamawa’s offer, the Z-PRO series represents stateof-the-art high-performance tapping, guaranteed to deliver high performance and reliability as well as long tool life. The VU series, part of the Z-PRO family, is a machine tap series specifically designed to be used in modern multitasking machining centres and for tapping with either oil or water-soluble cutting fluids, aiming at ensuring the highest quality and flexibility. VU taps are suitable for the machining of a broad range of materials, from steels to stainless steels and nonferrous materials with tapping speeds that span from 10 to 30m/minute depending on the application. Taps are made of coated Premium Powder High Speed Steel (HSSP) based on Yamawa specifications that ensure excellent wear resistance. The coating is suitable for water-soluble oil applications and, according to Yamawa, ensures these tools have good heat resistance and longer life than conventional machine taps. Another strength of Z-PRO VU series taps is the special geometry: Yamawa has completely revised the design of the flutes to target them on medium tapping speeds which allows efficient chip ejection, resulting in a lower and more stable tapping torque and, consequently, longer tool life with both the use of emulsion and oil. The VU series is composed New tool for milling drive shaft splines Arno has announced optimally designed tool holders for back working on Swiss-type auto lathes
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