Manufacturers: Are you struggling to choose between a mechanical and a hydraulic press for your manufacturing needs?
The hesitation is understandable – it’s a significant investment. If you choose incorrectly, setbacks could be costly. Not only would you waste money, but you would also experience halts in production due to poor production results or frequent maintenance.
But how do you decide which is the best option for your application, and where do you start?
Below, we’ll break down the standard features for both mechanical and hydraulic presses, and address the common considerations that will help decide between the two machines.
Before deciding on a mechanical or hydraulic press, it's important to know the basic attributes of each. Pairing these to the application at hand will help you determine which option is the best fit.
| Key Aspects |
Mechanical Press |
Hydraulic Press |
| Force Generation |
Flywheel, clutch, motor, crankshaft |
Fluid under pressure, pumps, valves |
| Applications |
Blanking, shallow forming, high-volume stamping |
Molding, deep drawing, forming, bending, punching, crimping, pressing, assembly |
| Energy |
Stored in flywheel |
Continuous |
| Speed |
High Strokes per Minute (SPM): 15-2,000 SPM |
Varies by stroke length |
| Cost |
Lower up-front cost |
Lower ongoing maintenance expenses |
| Maintenance |
Clutches, gears, flywheels |
Seals and pumps |
When deciding between a mechanical and hydraulic press, compare these critical factors. Each type generates force differently, catering to distinct applications and benefits.
Tonnage refers to the amount of force, measured in tons, that the machine needs to complete the task at hand.
In mechanical presses, tonnage is limited to certain points in the stroke and reflects the structural strength of its frame and drive components. Once the required tonnage is calculated, determine where in the stroke the tonnage is needed and the load distribution across the bed and slide. This ensures consistent force application while preventing overloading and uneven wear and tear.
Many types of hydraulic presses, on the other hand, offer full tonnage at any point throughout the whole stroke, eliminating the need for complex calculations. Load distribution is the biggest factor. A center load results in equal force distribution across all load-bearing connections.
Your application will help you determine which press is the best choice for your specific production needs.
Mechanical presses are best for productions that require higher speed, but don’t need full tonnage throughout the entire stroke. These are often used for shallow forming, high-volume stamping, or blanking. Mechanical presses can be found in the following industries:
| Industry |
Operations |
Products |
| Automotive |
Stamping |
Body panels and engine components |
| Aerospace |
Forming |
Parts and engine components |
| Electronics |
Cutting and forming |
Components, circuit boards, and casings |
Hydraulic presses are best for any application that needs full tonnage, held tonnage, or variable tonnage throughout the full stroke. These presses can be programmed to stop and hold a specific amount of force on a workpiece at any point during the operation. They’re found in many industries, including:
| Industry |
Operations |
Examples of Products |
| Manufacturing |
Light metal forming, bending, and punching |
Appliance parts |
| Electronics |
Crimping |
Connectors, terminals, and assembling components |
| Medical & lab settings |
Forming, assembly, and material testing |
Surgical instruments |
The sources of energy differ for mechanical and hydraulic presses.
In a mechanical press, an electric motor rotates a large flywheel, storing kinetic energy. When the clutch engages, that stored energy is released to drive the press stroke. A motor and belt drive keep the flywheel spinning until the press contacts the workpiece, releasing the energy suddenly onto whatever is being stamped, much like a hammer strike.
While mechanical presses are more energy-efficient, the availability of energy stored in the flywheel is the limiting operating factor.
In contrast, energy in hydraulic presses is continuous. Instead of storing energy, a hydraulic pump delivers a consistent amount of force, converting fluid power into kinetic energy, which drives the ram. This allows for steady and controlled force for the entire stroke, versus the sudden impact of a mechanical press.
Speed is measured differently in each type of press. In mechanical presses, speed is measured in strokes per minute (SPM), which ranges from 15-2,000. A mechanical press has a very high production speed, making it ideal for productions that require high volume.
A hydraulic press’s speed is measured by stroke length, or inches per minute (IPM). A hydraulic press operates more slowly than a mechanical press, making it best suited for lower-volume orders that don’t have time constraints.
A mechanical press is often less expensive to purchase compared to a hydraulic press. However, when considering the total cost of ownership, a hydraulic press is more economical. With fewer retooling requirements and lower maintenance needs, there’s less downtime in production. Plus, a hydraulic press is more energy-efficient, helping reduce operating costs and making it a smart overall investment.
Maintenance needs are similar in some regards for mechanical and hydraulic presses. Both need to be cleaned and cleared of debris regularly. Lubrication is also required consistently to reduce friction and wear, as well as maintain a steady production. Regular inspections should occur to make sure all systems are working properly, and there are no loose parts or obvious signs of wear and tear, like cracks in the frame or on the press bed.
Both presses have specific maintenance needs, too. Clutches, gears, and flywheels on mechanical presses take the brunt of the operation and need to be replaced the most. Maintenance with hydraulic presses is more predictable. They have fewer moving parts, requiring less future maintenance. It’s crucial to regularly check cylinder seals and pumps for signs of wear and damage. Leaking seals and pumps can cause pressure loss, reduce pressing force, and contaminate the hydraulic fluid, leading to early wear and costly repairs.
Which should you choose – a mechanical or hydraulic press? There are several key factors to consider as you make your choice, including speed, required tonnage, and material compatibility.
Mechanical presses are best suited for high-volume, repetitive operations. Choosing a hydraulic press means greater flexibility, with adjustable tonnage throughout the stroke, offering a smoother, more consistent pressure during production. This versatility makes them better suited for a wider range of materials and applications.
As far as energy consumption, mechanical presses must run continuously to keep the flywheel going. Likewise, standard hydraulic presses have an electric motor driving the hydraulic pump, which also runs continuously while the press is on.
While mechanical presses win in speed, hydraulic presses win in flexibility, precision, and versatility.
Both types of presses offer value to production lines. Overall, hydraulic presses provide more versatility and control in your production compared to the hammer-like action of mechanical presses. While a hydraulic press is more expensive initially, in the end, it proves to be the better long-term investment with lower maintenance and energy costs.
Multipress offers a wide range of hydraulic presses that can also be customized to your specific needs. Contact Multipress for personalized guidance on the right press solution for your production.