The OMCN 152 bench hydraulic press is a compact 6 ton press designed for professional assembly, disassembly, straightening and inspection operations on small and medium mechanical components. From the image and the dimensional drawing, it can be identified as a bench press with a welded vertical frame, upper hydraulic cylinder, connecting hose, side-mounted manual pump with lever and free working area between the uprights. The stated dimensions are A= 820 mm, B= 470 mm, C= 550 mm, D= 320 mm, E= 495 mm, F= 67 mm, G= 115 mm, H= 32 mm, with an approximate weight of 43 kg. These data describe a stable but easy-to-place machine for a workbench, technical workstation or maintenance department, whenever controlled pressing force is required without using a larger floor press.

This product is suitable for fitters, maintenance technicians, mechanical workshops, car mechanics, body shops, craftsmen, assembly departments, quality control areas, machine-tool builders and companies carrying out preventive or corrective maintenance. The press can be used to couple and separate components with interference fits, remove bushings, sleeves and bearings, insert pins, dowels, bushes and small shafts, perform controlled pressing operations and correct slight deformation on metal parts. In precision mechanics it is especially useful for straightening shafts after heat treatment and before grinding, when the component must be brought back within acceptable geometric limits before the final machining operation.

The press works through a manually operated hydraulic pump. The hydraulic oil is pressurised progressively and transfers the load to the ram, allowing the operator to dose the force more accurately than with direct impact or uncontrolled systems. This is important when working on bearings, housings, bushes, ground shafts, hardened parts or tight assemblies, because a sudden load can mark the part, deform a bore, damage a rolling track or create unwanted internal stress. When required, the force can be monitored by a pressure gauge, a useful accessory for improving process repeatability and for documenting pressing, inspection or maintenance operations.

The available working width between the uprights, D= 320 mm, and the useful height E= 495 mm allow a wide range of bench components to be handled while maintaining good access for workpieces and support accessories. Dimensions G= 115 mm and H= 32 mm define the ram operating area and must be considered when choosing punches, counter sleeves, V-blocks, plates and supports. The flexibility of the press depends not only on the machine itself, but also on the accessories available: to carry out all tasks correctly, it is recommended to purchase suitable supports, V-blocks for shafts, support plates, punches, pads, hollow extraction sleeves, adapters and, when needed, the pressure gauge. The right accessory distributes the load more evenly, keeps the part aligned and reduces the risk of bending, slipping or local marking.

For safe and technically correct use, the workpiece must be positioned securely, the pressing line must be centred with the axis of the component, and the rated capacity of the press must never be exceeded. Before pressing, it is good practice to clean contact surfaces, housings, shafts and bores, removing burrs, oxidation and machining residues. For interference-fit assemblies, diameters and tolerances should always be checked before applying force: if the part does not move after a smooth and progressive stroke, it is better to stop and check alignment instead of simply increasing pressure. Where technically allowed, light lubrication or a controlled temperature difference between shaft and housing may reduce the required force and improve the quality of the fit.

One of the practical secrets used by experienced fitters is to evaluate the operation not only by the force applied, but also by the behaviour of the component during the stroke. A smooth and steady movement usually indicates a correct fit, while sudden jumps, sharp noises or abnormal increases in resistance may indicate misalignment, dirt, burrs or excessive interference. For shaft straightening, it is advisable to proceed with micro-corrections, supporting the part on V-blocks, measuring runout with a dial indicator and applying the load gradually on the side opposite the deformation. After each small correction, the component should be unloaded and measured again, avoiding overshooting the required value. This method is particularly important after heat treatment, when material response can be less predictable.

When removing bushings and bearings, the component must always be supported on the correct surface, leaving the exit area free. For bearings, force must be applied to the ring involved in the interference fit: if the bearing is mounted on a shaft, the load must act on the inner ring; if it is fitted in a housing, the load must act on the outer ring. This avoids transmitting load through balls or rollers and reduces the risk of damaging the raceways. For bushes and bronze sleeves, using a pad with the correct diameter helps keep the pressure uniform and prevents ovalisation.

The 152 is therefore a flexible bench press for workshops needing a practical solution for frequent but not extremely heavy operations. Its compact structure, manual control, progressive force dosing and optional pressure-gauge reading make it useful for both light production and maintenance work. When used with correct supports, careful alignment and progressive load control, it improves safety, repeatability and quality on mechanical components, reducing common errors such as off-axis pressing, local deformation, damaged housings and uncontrolled assembly.