If you’re in the stamping, forging, or metalforming game, you’ve probably heard servo presses get hyped for their precision, energy savings, and flexible cycle times. But let’s be real—no one’s talking enough about their safety standards, right? As a servo press supplier, I get asked this at least once a week by fab shop owners, line managers, and even process engineers who’ve grown up on old mechanical presses and are nervous about switching to a servo setup. Safety isn’t an afterthought here; it’s baked into every part of how we design, test, and build these things. Let’s break down what actually makes a servo press safe, not just the marketing fluff you might see online. Servo Press
First, let’s clear up a common misconception: servo presses aren’t just regular mechanical presses with a servo motor swapped in. That tiny, high-torque motor is the brains behind their whole operation, which is exactly where their biggest safety perks come from. Old mechanical presses have a fixed crankshaft and flywheel, so their stroke, speed, and force curve are set in stone—you can’t adjust them on the fly. That inflexibility was a safety headache for decades, because if you had to tweak a process, you were modifying a machine that was built for one specific task. Servo presses? They can adjust their stroke length, slide speed, and even how much force they apply at different points in the stroke, all with a quick software update. But that flexibility doesn’t mean safety takes a backseat.
Now, let’s get into the actual safety standards that govern these machines, because “safety” is useless if it doesn’t follow a formal, vetted set of rules. The big ones here are global standards that most countries adopt or mirror: ISO 12100 (general machinery safety), ISO 16092-1 to -3 specifically for presses, and OSHA 29 CFR 1910 for US-based operations. These aren’t just checkboxes—they outline everything from risk assessments to emergency stop functionality, and every servo press we ship has to pass rigorous testing against all of these.
Let’s start with the biggest safety win that comes directly from the servo motor design: controllable motion. On a standard mechanical press, once the flywheel is spinning, the slide is moving through its cycle whether you want it to or not. If an operator reaches into the danger zone, the press is still coming down at full speed—there’s no way to stop that mass from moving fast. With a servo press, the motor can decelerate or reverse the slide mid-stroke in milliseconds. That’s a game-changer for accident prevention. For example, if an operator is adjusting a die (the part of the press that shapes the metal) and their hand slips past a safety light curtain, the servo motor doesn’t have the momentum of a flywheel— it can stop the slide before it makes contact, or even retract it entirely. We test this specific scenario every time a new press model goes into production: we simulate a hand intrusion at different points in the stroke, and the press has to stop within 10 milliseconds or less to meet ISO 16092-3 requirements. If it doesn’t, it gets sent back to the engineering team, no exceptions.
Next up, emergency stop (E-stop) systems, which are non-negotiable for any industrial machine, but servo presses have a unique edge here. ISO 13849-1 is the standard for safety-related parts of control systems, and it sets performance levels (PL) based on how reliable a system is at stopping the machine in a hazard. For our servo presses, we use PLd or higher for E-stop circuits—meaning they’re designed to fail safely, and they’re tested repeatedly to make sure a single fault (like a broken wire or a sensor error) won’t stop the E-stop from working. On old presses, E-stop usually cuts power to the whole system, which can cause unexpected movements or damage to the crankshaft. With servo presses, the E-stop circuit is hardwired separately from the main control system, so it doesn’t rely on software or network connections. Even if the main controller glitches, the E-stop will trigger a controlled deceleration (or full stop) instead of a hard, damaging cut to power. That’s a huge safety win—no more surprise slide movement after hitting the E-stop.
Then there’s safeguarding the danger zone, which is the area around the press where the slide moves and the die operates. Standard safeguarding for presses includes light curtains, two-hand control buttons, and mechanical barriers, but servo presses can sync their motion with these safeguarding systems way better than old presses. For example, if an operator needs to load a part manually (something that happens in high-mix low-volume production, where servo presses shine), a light curtain can be set to allow limited access only when the slide is in the upper, “safe” part of its stroke. On a mechanical press, you’d have to slow the whole press down or lock it out, which kills productivity. With a servo press, the controller is programmed to only lower the slide when the safeguarding system confirms no intrusion in the danger zone, and if the curtain is broken mid-cycle, the slide stops immediately—no full cycle wasted. We also integrate POSA (Press Operator Safety Assistant) software on all our presses, which syncs all safeguarding devices with the servo motor’s position, so every movement is matched to the safety system’s feedback. That’s not a add-on; it’s part of the base build to meet ISO 16092-2.
Another big safety point that a lot of people miss: force control, which is exclusive to servo presses. When you’re stamping thin metal parts, applying too much force can crack the part, but more importantly, if the die is misaligned, excess force can cause the slide to jam or even break, which is a major hazard. Servo presses let you set a precise force limit at every point in the stroke. If the press detects that it’s hitting more force than it should (like if a misaligned part is stuck), it will either stop or reverse the slide before the force reaches a dangerous level. That prevents die failure, machine damage, and reduces the risk of flying debris from a broken die. For forging applications, where forces are much higher, this is even more critical—you don’t want a 500-ton press slamming down on a misaligned workpiece and sending parts flying across the shop floor. We calibrate our force sensors monthly during production, and each press comes with a force logging feature that operators can pull up to check that safety limits haven’t been exceeded. It’s another layer that old mechanical presses can’t offer, since they apply force at a fixed, unadjustable rate.
But safety doesn’t stop at the machine itself—it’s also about training and setup, right? As a servo press supplier, we don’t just drop a press in your factory and walk away. We offer on-site training for operators and maintenance teams on all the safety features, how to program the motion limits, and what to do if an E-stop triggers. We also provide pre-startup safety audits, where our technicians walk through your shop’s layout, the die you’re using, and the safeguarding setup to make sure everything is aligned with the standards. A lot of accidents happen not because the machine is faulty, but because operators don’t know how to use its safety features correctly. We make sure that doesn’t happen with our customers.
Wait, let’s talk about common mistakes we see shops make when switching to servo presses. Some guys will take an old mechanical press’s safeguarding setup and plug it into a new servo press, and that’s where safety gaps pop up. For example, an old press might have a single light curtain, but servo presses require dual-channel safety systems for PLd compliance, because the controllable motion adds more variables. Or some shops will cut corners on software updates, which can patch safety vulnerabilities just like any other industrial system. We push our customers to do regular, official software updates through our certified technicians, not just free downloads from a random site—because those updates often include safety tweaks we’ve developed after testing new standards or new use cases.
Another thing: lockout/tagout (LOTO) procedures, which are required by OSHA for maintenance work. On a servo press, the LOTO system is designed to be integrated with the servo motor’s control, so you can’t accidentally activate the slide while you’re working on the die or the motor. Old mechanical presses have LOTO that locks the flywheel, but if someone forgets to lock it, the press can move. Our servo presses have a physical lock on the main control cabinet and a secondary lock on the motor’s power supply, plus a software lock that disables all motion when LOTO is engaged. That’s three layers of protection, which is way more than the minimum required by OSHA, but we think it’s necessary for a machine that generates thousands of tons of force.
Let’s get real, though—safety isn’t free, and it’s not the sexiest part of a servo press. Our customers sometimes ask us to cut costs by skipping certain safety features, but we never do. For example, the high-resolution encoders that track the servo motor’s position 10,000 times a second aren’t cheap, but they’re what let the press stop instantly if a hand is in the danger zone. Without those encoders, the controllable motion that makes servo presses safe would be impossible. We build every press with those encoders as standard, not an add-on, because cutting them would put operators at risk.
At the end of the day, the safety standard for a servo press isn’t just a list of numbers on a spec sheet—it’s a promise that every part of the machine is designed to prevent harm, not just meet a minimum regulatory requirement. As someone who’s been building and supporting servo presses for years, I’ve seen the difference these features make: no more lost fingers, no more broken dies, no more down time from preventable accidents.
If you’re looking to upgrade to a servo press and want to make sure your safety setup is up to par, or you have questions about how our presses meet global standards, hit us up for a procurement consultation. We can walk you through the safety features, help you match a press to your specific application, and make sure your shop is compliant with all the latest regulations. No pressure, just straight talk about keeping your team safe and your operations running smoothly.
H-Frame Press References
ISO 12100:2010, Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 16092-3:2019, Safety of presses — Part 3: Mechanical presses
ISO 13849-1:2015, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design
OSHA 29 CFR 1910.217, Mechanical power presses
Ningbo Goanwin Machinery Manufacturing Co., Ltd.
Ningbo Goanwin Machinery Manufacturing Co., Ltd. is well-known as one of the leading servo press manufacturers and suppliers in China. Please feel free to buy high quality servo press from our factory. For more information, contact us now.
Address: No.318 Guangming Road, Guangming Industrial Zone, Zhenhai District, Ningbo, China
E-mail: ivy@goanwin.com
WebSite: https://www.goanwin.com/
