![]() ![]() Yet, tool holders should be as simple and easy to use as possible to minimise the possibility of operator error. Workpiece factors influence holder selectionįactors influencing toolholder selection include the machinability of the workpiece material in each job as well as the configuration of the final part, which may determine the tool holder dimensions needed to reach certain contours and/or features. Aerospace manufacturers typically take extended time to validate new holder concepts before certifying them for production. Particularly in industries such as aerospace component manufacturing where stability of the machining process is paramount, many manufacturers focus above all on acquiring premium tooling to avoid producing defective parts and wasting time in troubleshooting activities and production stoppages. Premium tools and holders can boost metal cutting production rates for immediate return on the tooling investment. Even cutting that cost in half produces negligible savings, while a scrapped workpiece or broken tool has a measurable financial effect. ![]() Tool holders represent less than 2% of total production costs. However, always applying the shortest holder possible will maximise rigidity, minimise surface-degrading vibration and preserve tool life. But in operations where repeatable precision is mandatory – and especially when scrapping an expensive workpiece will lessen part profit margins – the investment in application-focused, top-quality tool holders provides low-cost insurance against such unanticipated losses.įor some shop managers, long versions of tool holders used across a range of applications is a valid cost-saving strategy. In noncritical jobs, a value-priced tool holder may produce satisfactory results. Use of an inappropriate tool holder can result in dimensional errors and scrapped parts along with excessive wear on machine tool spindles, shorter tool life and an increase in tool breakage. Additionally, a toolholder’s abilities to damp vibration as well as deliver coolant are also important selection criteria. Tough workpiece materials require tool holders with enhanced strength and rigidity. Addition, the robust design and bulk of a roughing holder can limit its access to fine or deep part features. Conversely, a holder meant for rough machining usually will lack balance qualities that would allow it to run smoothly at high speeds in finishing operations. A tool holder engineered to carry out high-speed finishing operations typically will lack the rigidity and strength needed to be effective in, for instance, deep roughing of raw castings. No one tool holding method is appropriate for all possible applications. ![]() Nevertheless, while shops seek to acquire the most advanced machine technology and cutting tool materials, they often place minimal importance on selecting, applying and maintaining tool holders that best fit their specific production needs. A machining shop, therefore, should base its choice of tool holders on its specific operations as well as on the parts it produces. Tooling manufacturers offer a wide variety of tool holder styles, with each engineered for optimum performance in certain machining applications. ![]()
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