Mechanical eccentric presses

 

EMG mechanical presses use a proven kinematic process to stamp, deform, and cut sheet metal with speed and precision. The electric motor drives the flywheel continuously via V-belts, building up a substantial reserve of kinetic energy. When a stroke is initiated, the clutch connects this spinning flywheel to the eccentric shaft: the offset geometry of the eccentric converts rotational energy into a controlled vertical displacement, transmitted to the ram via the connecting rod.

 

All the mechanical adjustments built into every EMG press (stroke selector, daylight setting, and ballscrew adjustment) make it straightforward to configure the machine for each application. Bronze guides direct the ram's descent from top to bottom with consistent precision, ensuring perfect alignment between the lower tool fixed to the table and the upper tool clamped to the ram. The gooseneck C-type absorbs the full forming force (up to 80 tonnes) without distortion, maintaining this alignment across millions of cycles.

 

A pneumatic single-disc clutch and managed braking system govern each cycle. From the 25T model upwards, an air reservoir compensates for any pressure fluctuation in the plant network. The dual-body, self-monitoring solenoid valve (fitted with a self-cleaning silencer) controls clutch engagement with the control reliability required by CE safety standards. The press can operate in single-stroke (coup par coup) or continuous-run mode, selectable from the control panel.

 

The centralised lubrication system keeps the eccentric shaft, connecting rod, and gib guides continuously supplied with the correct oil film (protecting bearing surfaces and ensuring consistent cycle performance even in high-duty-cycle environments).

 

 

 

Mechanical vs. Hydraulic vs. Servo Presses: Why Choose Mechanical?

 

Choosing the right press technology is a capital decision with long-term consequences on productivity, maintenance costs, and total cost of ownership. Here is an objective comparison to help you decide:

 

EMG mechanical eccentric presses are faster than hydraulic presses and offer very high repeatability with a low risk of breakdown, thanks to a mechanically simple drivetrain with no hydraulic seals to fail, no fluid to contaminate, and no pump curves to manage. For high-volume blanking, punching, stamping, and assembly, they are the default choice in most production environments worldwide. Our range of standard mechanical presses offers speeds of up to 240 strokes per minute (6 tonnes) and 100 strokes per minute (80 tonnes).

 

Hydraulic presses offer greater flexibility (full rated force at any point of the stroke, programmable dwell time, and adjustable stroke length) making them the right tool for deep drawing, hydroforming, and forming complex geometries. But this flexibility comes at the cost of speed, more intensive maintenance, and higher long-term running costs.

 

Servo-mechanical presses offer a fully programmable stroke profile and outstanding energy efficiency for demanding applications such as fine blanking or forming advanced high-strength steels (AHSS). However, their capital cost is substantially higher (typically three to five times that of an equivalent mechanical press) which makes them a specialist investment, not a general-purpose choice.

 

 

C-Frame (Gooseneck) Architecture: Open Access, Compact Footprint

 

All EMG mechanical eccentric presses feature a C-Frame (gooseneck) architecture, the most widely used configuration for workshop and production-line metal forming. The defining advantage is unrestricted access on three sides of the working area (front, left, and right), which simplifies manual loading, coil-fed strip feeding, and robotic integration without requiring complex guarding architectures.

 

EMG C-presses are fabricated from mechanically welded high-quality steel. Consistent, full-penetration weld beads and generous weld material ensure exceptional rigidity and resistance to the impact shocks generated by blanking and stamping, even under sustained intensive use. The thick side walls limit gooseneck opening under load (the inherent trade-off of single-column architecture) while conservative tonnage ratings keep working loads within the elastic range of the structure.

 

• Quick stroke change by declutching : no tools required, no downtime.
• Adjustable gib guides in hardened steel or bronze, ground and hand-scraped, for consistent ram alignment throughout tool life.
• Tiltable bed to 20° on 45T and 80T models : facilitates gravity ejection of blanked parts without a separate conveyor.
• Positive ejector rod through the ram with adjustable stop on the frame : standard on all models.
• Hydraulic ram unlocking (45T and 80T) and automatic stroke-change declutching (80T) for rapid reconfiguration.
   

 

 

Being performance-oriented, these execute the most demanding applications with precision and reliability: watchmaking, jewellery, mechanical optics, electrical and electronic machines, automotive industry, electrical goods, toys, locksmithing...

 

Blanking & Cutting: Press Cutting Machine The EMG eccentric press forces a hardened punch through sheet metal into a precision-ground die, producing finished blanks or accurate holes with minimal burr. The welded steel C-Frame and FGS 300 cast iron slider (mounted on adjustable bronze sliding rails) maintain consistent cut clearance across the full production run. The range supports coil-fed setups with uncoiler, straightener, and strip feeder configurations available.

 

Stamping: Stamping Press Machine As a stamping press machine, EMG presses shape flat stock into three-dimensional forms using matched male/female tooling. The models support coil-feed lines; the 20° inclinable frame — standard on 6T and 15T, available as an option on 45T and 80T — simplifies blank ejection and scrap clearance in continuous-run stamping operations.

 

Bending & Flanging: Bending Press / Folding Press Used as a bending press or folding press, EMG presses fold sheet metal along a defined axis using V-dies or wiping dies. The quick stroke-change system — operated by a ¼-turn release — allows rapid repositioning between successive bends without stopping the motor, making multi-angle flanging sequences efficient on one machine across the range.

 

Pressing & Coining: Forming Press Machine As a forming press machine, the EMG eccentric press delivers maximum force at bottom dead centre, forcing material into every cavity of a closed die. The 45T and 80T models are equipped with slider hydraulic unblocking at BDC — a standard feature that protects tooling and the press structure during high-force coining of fasteners, structural inserts, and branded component markings.

 

Assembly & Press-fitting: Assembly Press The open C architecture makes EMG presses the natural assembly press for bearing insertion, pin pressing, bushing installation, and interference-fit joining. Single or continuous stroke selection, combined with two-hand controls and a positive ejector in the slider, supports both manual and automated loading across the 6T–25T range.

 

Riveting: Rivet Press As a rivet press, the EMG eccentric press permanently joins components by upsetting a rivet shank in a single controlled stroke. The monodisc air clutch and brake assembly provides the precise stroke control required for consistent rivet head geometry across high-volume production runs.

 

Marking & Embossing: Embossing Press Machine The connecting rod swivel screw on EMG presses provides fine ram-height adjustment, enabling controlled depth for raising or recessing logos, serial numbers, and stiffening ribs without severing the material. This operation is commonly integrated inline with blanking, eliminating a separate marking station. EC certification and the included periodical verification guide support regulatory traceability requirements.