Blog

Which Power Source is Best to Run Punch Presses?

amada 2510NT turret punch pressEVS Metal recently acquired a state-of-the-art Amada servo-electric turret punch press for their New Hampshire facility. This marks the third EVS location that features servo-electric punch press technology. What makes this punch press so much more advanced than machines of the past that EVS would want to invest hundreds of thousands of dollars in such an upgrade? A large part of the reasoning involved the type of power that is used to operate the machine. The three main power sources are mechanical, hydraulic and servo-electric. As stated above, our new punch press utilizes servo-electric power — the most efficient of the sources. Today, we’ll take a look at each type in order to demonstrate why servo-electric-powered machines are the best of the bunch.

Mechanical Power

Mechanical punch presses are the least common type in use at the moment. Mechanical power utilizes a clutch and brake system that triggers a flywheel, which in turn activates a Pitman arm. This is the oldest type of turret punch press technology.

Mechanical machines can offer precision, as well as labor and energy savings. They are also fairly small and take up limited space on the shop floor. However, they are generally not as cost effective as other types of punches, and they aren’t as efficient as newer servo-electric-powered options.

Hydraulic Power

Hydraulic-powered turret punch presses are quite different than those which run on mechanical power. There are no motors turning a flywheel or clutches actuating a Pitman arm. Instead, it simply uses a hydraulic cylinder to do the punching, which is supported by various equipment so that the punching action is very precise. However, hydraulic presses can be large, depending on the one chosen. This is one reason why servo-electric presses, even though they are considerably more expensive than hydraulic, are considered an excellent investment for those who can afford to add them to their stable of machines. For even the largest metal fabricators, floor space will always come at a premium and is considered valuable real estate for the company.  

Hydraulic machines are accurate and get the job done. They are the most common type of punch press currently in use. However, they are not considered efficient, especially when compared with servo-electric-powered machines. In addition, there are challenges with repeatability, due to the heating and cooling of the hydraulic fluid (a chiller must be used to keep the temperature consistent, which makes it expensive to power), as well as reliability. They also require frequent oil changes to keep the hydraulics in working order, which can be an expensive maintenance issue.

Servo-Electric Power

Our new Amada 2510NT turret punch press uses a single AC servo-drive to power the Pitman arm that drives the machine’s punch-pressing operation, rather than pneumatic or hydraulic power. The machine’s electric motor is equipped with an encoder that allows it to turn precisely based on a set “program,” making it more efficient to run as it’s only using power when it is firing the Pitman arm to move the ram and actuate the punching action.

Because it uses less energy, it is less making it less expensive to operate. In fact, it consumes only 4.5kW of power at its highest run rates; this is about 3 to 4 times less than a typical hydraulic machine. Even its standby power consumption is low — the lowest of all similar Amada machines. While more energy-efficient, these presses still offer the processing speed of hydraulic-powered machines. And because they aren’t powered by pneumatic or hydraulic power — two comparably complex systems — servo-electric presses require less maintenance, while still being incredibly reliable.


About EVS Metal

EVS Metal is an American precision metal fabricator headquartered in Riverdale, NJ. Our machinists and operators utilize the latest technology to cut, bend and finish stand-alone items as well as parts for integration or assembly into more complex products. EVS Metal’s four ISO 9001:2015-certified locations comprise over 250,000 square feet of vertically-integrated manufacturing space and feature the most modern equipment available, from lasers and CNC machining centers to automated powder coating lines.

We serve a diverse customer base across North America, providing a range of services from ITAR-compliant, quick-turn prototypes to high-volume production runs. Request a personalized metal fabrication quote online or call (973) 839-4432 to speak with a specialist today

Leave a Reply

Your email address will not be published. Required fields are marked *