The 035350 feed finger collet is a technical component for the Cucchi Pietro PB35 automatic bar feeder, manufactured with M18x1.5 left-hand thread and 35 mm outside diameter. Its function is to connect the feeder pushing system to the bar to be fed, gripping the material in a controlled way and transmitting the feed movement required by the turning cycle. It is used on automatic lathes, CNC lathes and Swiss-type CNC machines, where feeding continuity, bar stability and correct position in relation to the machine axis are essential to maintain accuracy, productivity and machined-part quality.

During operation, the collet closes on the bar and allows the feeder to push the material towards the spindle or machining area according to the machine-cycle sequence. A correctly sized component reduces slipping, vibration, irregular feeding, sticking and loss of centring. This is particularly important in bar turning on Swiss-type machines, where even small alignment errors or transmission backlash can affect surface finish, dimensional accuracy, tool life and process repeatability.

The collet should be selected by considering the Cucchi Pietro PB35 feeder model, bar type, diameter or profile to be fed, compatibility of the M18x1.5 left-hand thread, condition of the pusher tube, guide condition, spindle-line height and alignment between bar feeder and lathe. A collet correctly matched to the material reduces the risk of irregular dragging and allows the feeding system to operate with greater continuity. On the other hand, a worn collet, a collet not consistent with the bar geometry or a system that is not correctly aligned may cause loss of grip, marks on the material, noise, vibration and machine downtime.

Feed finger collets can be supplied for round, hexagonal or square bars. For profiled bars, the machining reference is not a generic diameter but the corner dimension, in order to obtain a grip consistent with the real geometry of the material. This dedicated grinding is important to prevent irregular contact, local deformation, loss of centring and abnormal wear on the contact surfaces. For hexagonal or square bars, checking the corner dimension and the correct profile geometry helps improve feeding stability and reduce form errors caused by uneven gripping.

From a maintenance point of view, it is advisable to periodically check thread cleanliness, integrity of the gripping surfaces, absence of burrs or deformation, component concentricity and smoothness of the closing movement. It is also useful to check backlash in the pushing transmission, condition of the bushings, pusher tube, feeder guides, axial settings and system height in relation to the machine axis. The collet is not a measuring instrument, but it requires accurate dimensional and geometric checks because the correct match between bar, collet and feeder directly affects the precision of the complete system.

The 035350 feed finger collet for Cucchi Pietro PB35 is suitable for machine shops, automated production departments, bar turning companies, maintenance specialists, machine builders, laboratory technicians, process engineers and quality control managers. It is a professional spare part designed to restore or maintain feeder efficiency, reduce scrap, improve cycle regularity and limit machine downtime related to material feeding. Tadaah offers this component with attention to technical compatibility and application support, providing useful assistance for selecting the collet according to the feeder, bar, profile and real working conditions.