The Type 172200 revolving live centre with compression is a technical lathe accessory designed to support the workpiece on the side opposite the chuck, ensuring centring, axial stability and controlled rotation during turning operations. Its main function is to support and guide the component through the centre point, reducing deflection, vibration and misalignment that may compromise the dimensional and geometric quality of the workpiece. The compression version integrates a controlled axial stroke that allows the live centre to absorb small length variations, workpiece settling, thermal expansion or thrust differences during the machining cycle.

The product is particularly suitable for machining shafts, pins, bushings, cylindrical components, turned parts and workpieces that need to be supported between chuck and tailstock. In lathe machining, correct axial support is essential to keep the part aligned, improve cutting stability and limit shape errors such as taper, ovality, surface vibration marks or dimensional differences along the machined length. The revolving live centre allows the support point to rotate with the workpiece, reducing friction compared with a dead centre and improving process continuity.

The distinctive feature of this version is the integrated compression, with stroke C= 2 mm. This stroke allows the live centre to adapt to slight axial variations without generating excessive pressure on the workpiece centre. In real machining conditions, the component may vary due to clamping, heating, tool pressure or settling between support points. A live centre with compression helps maintain more regular contact, avoiding both loss of support and overload that could mark the centre hole, deform thin parts or unnecessarily increase stress on the bearings and the machine.

The detected geometry shows an internal point Ø 90° and an external point Ø 60°. This configuration allows the centre to work with different centring and support conditions, offering a useful solution when the workpiece has centre holes, conical seats or requires differentiated support. The external 60° angle is a widely used geometry for support on standard centres, while the 90° internal geometry allows specific support on certain profiles or diameters, contributing to contact stability. The correct support area must be selected according to the workpiece shape, the type of centre prepared, the required axial load and the surface quality to be preserved.

The live centre is manufactured with a cylindrical fitting, suitable for integration into specific supports, housings, fixtures or tailstock units designed for this type of mounting. The technical data indicate body diameter D= 32 mm and dimension H= 39.5 mm for all versions. Length L varies according to fitting diameter d1: for versions with d1= 8 mm, d1= 10 mm, d1= 12 mm, d1= 14 mm, d1= 15.875 mm and d1= 16 mm, dimension L= 35 mm; for versions with d1= 19.05 mm, d1= 20 mm, d1= 22 mm, d1= 25 mm and d1= 25.40 mm, dimension L= 46 mm. This difference must be considered when selecting the product, because it affects overall size, working position, useful distance between machine elements and compatibility with the support equipment.

The d1 diameter must be selected according to the seat available on the machine or fixture. The available versions include d1= 8 mm, d1= 10 mm, d1= 12 mm, d1= 14 mm, d1= 15.875 mm, d1= 16 mm, d1= 19.05 mm, d1= 20 mm, d1= 22 mm, d1= 25 mm and d1= 25.40 mm. The presence of both metric and fractional diameters allows adaptation to different mounting systems, including equipment, fixtures and machines with different dimensional standards. Correct selection prevents coupling play, vibration, eccentricity and loss of accuracy during rotation.

From an application point of view, this live centre is useful when the workpiece must be supported with constant but not rigid pressure. With long, slender or flexible parts, tailstock support helps improve cutting stability and reduce the risk of vibration. In finishing operations, where surface quality and geometric accuracy are important, compression helps maintain controlled contact without applying excessive load. In maintenance departments and re-machining operations, the compensation function can be particularly useful when workpieces do not always have perfectly repeatable lengths or when existing components are being reworked.

To obtain a correct result, alignment between chuck axis and tailstock axis must be checked. Even a high-quality live centre can generate errors if the machine has misalignment, transmission play, worn guideways or incorrect clamping. Alignment errors can produce taper, vibration, centre marks, abnormal point wear or workpiece instability. Before use, it is therefore advisable to check the cleanliness of the cylindrical seat, the absence of burrs, the correct locking of the fixing system and free rotation of the point. The compression stroke must operate without obstruction, avoiding contamination, chips or residues that could limit axial movement.

During machining, tailstock pressure must be adjusted carefully. Insufficient pressure may cause loss of support, vibration and poor workpiece stability; excessive pressure may cause deformation, overheating, damage to the centre hole or overload of the rotating system. The compression C= 2 mm provides limited but very useful compensation to stabilize contact, but it must not be interpreted as a system for correcting major positioning or clamping errors. The accuracy of the result always depends on correct workpiece preparation, centre quality, machine rigidity and axial load adjustment.

In quality control, using a suitable live centre helps reduce shape and geometry errors, improving dimensional consistency between parts machined in series. In automotive and precision engineering, where shafts, pins and rotating components require concentricity, stability and controlled finishing, a revolving support with compression can help maintain more constant working conditions. In preventive and corrective maintenance departments, the product is useful for supporting parts during reworking, light grinding, dimensional checks or restoration machining.

The Type 172200 revolving live centre with compression is therefore a professional solution for operators and technicians requiring a compact, accurate and adaptable axial support for different machine configurations. The combination of cylindrical fitting, body D= 32 mm, H= 39.5 mm, stroke C= 2 mm, internal point Ø 90°, external point Ø 60° and wide availability of d1 diameters allows the product to be integrated into many turning contexts, providing greater workpiece stability, better contact control and effective support in operations where precision and repeatability are essential.