The 034236 quick-change collet is a technical component for FMB, TRAUB, HAGENUK, IEMCA, ROBOBAR, LNS, SAMECA, MINISPRINT and MINITURBO automatic bar feeders, with operating range from Dia. 10 to Dia. 30 mm and 36 mm outside diameter. Its function is to grip the bar, guide it correctly and transmit the feed movement generated by the bar feeder towards the lathe. It is used on automatic lathes, single-spindle lathes, multi-spindle lathes, CNC lathes and Swiss-type CNC machines, where feeding stability, gripping quality and correct material position in relation to the machine axis are essential to maintain production continuity, dimensional accuracy and machining-cycle reliability.

The quick-change configuration is particularly useful in workshops and production departments working with different batches, variable diameters or frequent format changes. It allows faster collet replacement than conventional systems, reducing setup time and supporting more efficient bar feeder management. During the machine cycle, the collet works as the connecting element between the feeder pushing system and the bar to be fed. The closing action on the material must be stable, repeatable and consistent with the bar geometry, because insufficient gripping can cause slipping, irregular feeding and loss of position, while incorrect gripping may mark the material, generate vibration or cause sticking.

The 034236 collet should be selected by considering the installed bar feeder, nominal or real bar diameter, material profile, operating range from Dia. 10 to Dia. 30 mm, 36 mm outside diameter, spindle-line height, alignment between bar feeder and lathe, condition of the pusher tube, guides, bushings and backlash in the feed transmission. The dimensional range is suitable for small to medium bars and requires accurate checking of actual material size and tolerance, because the correct match between collet and bar directly affects gripping quality, dragging continuity, cycle stability and vibration reduction. Correct matching provides smoother pushing, better feed repeatability and reduced machine downtime.

Quick-change collets for automatic bar feeders can be supplied for round, hexagonal or square bars. For profiled bars, grinding is carried out according to the corner dimension rather than a generic diameter, so that the gripping surface matches the real geometry of the material. This dedicated machining is important to prevent irregular contact, loss of centring, vibration and localised wear on the contact surfaces. For hexagonal or square profiles, correct evaluation of the corner dimension allows the collet to distribute the grip more effectively and keep the material stable during feeding, stopping, restarting and bar-change phases of the feeder.

From an operational and maintenance point of view, the collet should be checked periodically for cleanliness of the coupling surfaces, integrity of the gripping areas, absence of burrs, abnormal elastic deformation, irregular contact marks and loss of concentricity. It is also advisable to check axial settings, feeder height, alignment with the spindle, pusher tube, bushings and guides, because feeding precision depends on the interaction of all these elements and not only on the individual component. A worn collet or a collet not consistent with the bar profile may cause noise, vibration, discontinuous feeding, positioning errors and quality problems on the machined part.

The 034236 quick-change collet is suitable for machine shops, bar turning companies, CNC departments, single-spindle and multi-spindle lathe production, maintenance specialists, machine builders, laboratory technicians, process engineers and quality control managers. It is a professional spare part used to maintain the efficiency of the feeder system and to improve continuity, reliability and precision in automatic production. Tadaah offers this component with attention to technical compatibility and application support, helping select the correct collet according to the installed feeder, required diameter, bar geometry and real working conditions.