{"id":602,"date":"2026-10-21T09:19:37","date_gmt":"2026-10-21T01:19:37","guid":{"rendered":"http:\/\/www.divrigidernegi.com\/blog\/?p=602"},"modified":"2026-10-21T09:19:37","modified_gmt":"2026-10-21T01:19:37","slug":"how-does-a-six-axis-collaborative-robot-deal-with-external-forces-495f-959df4","status":"publish","type":"post","link":"http:\/\/www.divrigidernegi.com\/blog\/2026\/10\/21\/how-does-a-six-axis-collaborative-robot-deal-with-external-forces-495f-959df4\/","title":{"rendered":"How does a Six – Axis Collaborative Robot deal with external forces?"},"content":{"rendered":"

If you\u2019re in the industrial automation space, you\u2019ve probably seen a six-axis cobot work its magic\u2014whether it\u2019s tightening screws on a car assembly line, picking delicate food packaging, or helping a lab sort test tubes. But have you ever stopped to wonder how these robots don\u2019t slam into a coworker, fumble a fragile part, or accidentally push too hard against a surface they\u2019re working on? As a supplier of these exact robots, I get this question all the time, and it\u2019s way more interesting than just \u201cthey have sensors.\u201d Let\u2019s break down how six-axis collaborative robots (cobots) handle external forces\u2014no jargon, just the real stuff we deal with every day. Six-Axis Collaborative Robot<\/a><\/p>\n

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First, let\u2019s set the scene: my team and I build these robots for small to mid-sized manufacturers, so our cobots aren\u2019t the big, caged industrial arms you see in old factory movies. They\u2019re meant to work right next to human operators, which means they can\u2019t be programmed to just muscle through anything. External forces\u2014like a worker bumping the arm mid-task, the robot pressing too hard on a workpiece, or even a gust of wind shifting a light payload\u2014are a constant factor, and our cobots have to react fast.<\/p>\n

The core piece here is force torque sensors (FTS), and yeah, that\u2019s a real acronym we use daily. Wait, no\u2014let\u2019s be honest, we just say \u201cFTS\u201d around the shop to save time. Most six-axis cobots have one or two FTS units: usually one at the wrist, right where the end effector (the tool that does the work, like a gripper or a screwdriver) attaches, and sometimes a smaller one at the base. What these sensors do is measure force in six directions: three linear (forward\/back, left\/right, up\/down) and three rotational (twist, pitch, roll). Think of it like having a tiny super precise scale that can tell not just how hard you\u2019re pressing, but the angle of that press. That\u2019s way better than just a single force sensor, which would only tell you \u201csomething is pushing\u201d instead of \u201csomething is pushing from the side at a 45-degree angle.\u201d<\/p>\n

But sensors alone aren\u2019t enough. We pair that FTS data with joint torque sensors\u2014one in each of the six axes of the robot. Six axes = six joints, right? That\u2019s what makes a six-axis cobot so flexible, like a human arm with a shoulder, elbow, wrist, etc. Each joint\u2019s sensor measures how much torque (twisting force) is going through that specific part. So if someone bumps the robot\u2019s shoulder, the joint torque sensor there will pick up the extra twist way before the wrist FTS even registers it. That\u2019s the first line of defense\u2014we can catch small, unexpected forces at the source before they turn into a bigger problem.<\/p>\n

Here\u2019s the part that makes it collaborative, not just a fast robot: the control system. Every millisecond, we\u2019re processing that FTS and joint torque data. Our cobots run on custom software we built in-house, not some generic off-the-shelf program, so we can tweak the reaction speed exactly for the job. For example, if a cobot is picking up a 1kg plastic part, we set a lower force limit\u2014if it meets something pushing back harder than 5N (that\u2019s like the weight of half a kilo, or a small bag of apples), it\u2019ll stop immediately. But if it\u2019s moving a 10kg metal bracket, we can bump that limit to 20N, because the part is heavier and needs a bit more force to handle. That\u2019s a big difference from old industrial robots, which had no force feedback and would just keep moving until they hit something hard enough to break their own motors.<\/p>\n

Wait, let\u2019s talk about what happens when the robot does detect an external force, because that\u2019s the part customers always want to see. Last month, one of our customers (a small electronics shop in Ohio) had an operator reach in to adjust a gripper mid-program\u2014no, that\u2019s not a mistake, sometimes you need to tweak things without hitting pause. The cobot\u2019s wrist FTS picked up the light touch of the operator\u2019s hand, immediately sent a signal to the control system, and the arm slowed down and stopped in less than 10 milliseconds. That\u2019s faster than you can blink. We\u2019ve tested this a hundred times: if a 100kg force hits the arm from the side (like a forklift accidentally nicking it), it will shut down before any damage happens, to both the robot and the person who hit it.<\/p>\n

But it\u2019s not just reacting to force\u2014our cobots also use external force to do their jobs better. For example, if you\u2019re sanding a curved piece of wood, you don\u2019t want to apply the same pressure all over the curve. Our FTS lets the robot adjust its own force in real time: if it\u2019s sanding a bump, the force sensor picks up higher resistance, so the cobot pulls back a tiny bit to keep the pressure consistent. That\u2019s a trick we teach all our customers in the free training we include with every robot. We don\u2019t just sell a robot\u2014we train their team to use the force features, because that\u2019s where the real value is.<\/p>\n

Now, let\u2019s get real about the limits, because no robot is perfect. We\u2019ve had customers try to use our cobots for tasks they weren\u2019t designed for, like lifting 50kg of heavy steel parts. The FTS will detect that the force is way over our programmed limit, and shut down\u2014so we tell them to get a heavier industrial robot, because six-axis cobots are for collaboration, not heavy lifting. Also, external forces from dynamic things, like a worker swinging a heavy tool near the robot, can cause sensor noise. We deal with that by calibrating the sensors every time we set up a new robot at the customer\u2019s shop, so it can tell the difference between a normal task force and an unexpected external force.<\/p>\n

Another thing people don\u2019t talk about: safety standards. Our six-axis cobots are certified to ISO 10218-1 and TS 15066, which are the rules for industrial and collaborative robots. The TS 15066 standard specifically lists how much force a robot can apply to a human without causing injury\u2014like 150N to the back, 50N to the hand. That\u2019s why our force limits are set within those ranges. We don\u2019t cut corners here, because we\u2019ve seen first-hand what happens when a robot is too aggressive. A customer in Michigan tried a cheap cobot from another supplier that didn\u2019t have proper force sensing, and it nicked an operator\u2019s hand\u2014we learned a lot from that incident, and built our software to be way more sensitive to light, small forces.<\/p>\n

Wait, let\u2019s share a quick story to make this concrete. A few months back, a small medical device manufacturer reached out to us because their old robot kept dropping tiny insulin pen caps. The caps are only 1cm wide, and if the robot gripper applies too much force, it crushes them; too little, and they fall. Our six-axis cobot has a force sensing gripper with FTS, so we programmed it to grip the cap with just 10N of force. When the robot picks up a cap, the FTS confirms it\u2019s holding it securely, and if the cap shifts, the sensor adjusts the grip force automatically. They went from a 12% defect rate to 0.2% after switching to our robot\u2014all because the force sensing could handle the tiny, delicate external forces from the cap.<\/p>\n

Now, what about if the robot is working in an environment with variable external forces, like a factory floor with uneven floors? The base-mounted FTS helps with that too\u2014if the floor shifts a little, or the robot is sitting on a wobbly workbench, the base sensor picks up that shift and adjusts the arm\u2019s movement to keep the task consistent. We didn\u2019t add that base sensor to every robot for no reason\u2014it\u2019s for those tricky industrial environments that aren\u2019t perfectly level.<\/p>\n

I know a lot of people think robots are \u201cjust computers,\u201d but these force handling systems are a mix of hardware and software that we\u2019ve refined over 10 years of building cobots. We test every single robot before it leaves our warehouse: we bump the arm, press on it with different forces, test how it reacts to sudden movements, and calibrate the sensors three times to make sure everything is working right. No cobot leaves our shop until it passes a force test that\u2019s way stricter than the minimum required by standards.<\/p>\n

If you\u2019re thinking about adding a six-axis collaborative robot to your shop, you might be wondering if this force handling is enough for your specific job. The answer is almost always yes, as long as the task is collaborative. We\u2019ve used our robots for everything from food packaging to electronics assembly to small metal fabrication, and every time, the force sensing handles the unexpected stuff\u2014like a worker\u2019s hand, a part that shifts, or a surface that\u2019s uneven. The key is working with a supplier that knows how to program the force limits for your exact task, not just using generic settings.<\/p>\n

So, to wrap this up: a six-axis collaborative robot doesn\u2019t just \u201cavoid forces\u201d like a big industrial cage robot. It has two sets of sensors (joint torque and force torque) that catch force at every point of the arm, fast software that processes that data in milliseconds, and control systems that adjust movement or stop entirely based on force limits set for safety and the job. It\u2019s not magic\u2014it\u2019s careful engineering, and that\u2019s why we\u2019ve been able to sell over 2,000 cobots to small manufacturers across the country.<\/p>\n

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If you\u2019re ready to stop worrying about your robot crashing into your team or fumbling your delicate parts, let\u2019s chat about your needs. We can walk you through how our six-axis cobots handle external forces specific to your tasks, and even show you case studies from other customers in your industry. Don\u2019t settle for a generic robot\u2014work with a supplier that builds force handling into every part of the design, not just an afterthought.<\/p>\n

Six-Axis Collaborative Robot<\/a> References
\nRobotics Industries Association. (2020). Collaborative Robot Safety Standards.
\nISO 10218-1. (2011). Robots and robotic devices \u2014 Safety requirements for industrial robots \u2014 Part 1: Robots.
\nISO TS 15066. (2016). Robots and robotic devices \u2014 Collaborative robots.<\/p>\n

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Xinweilai Intelligent Technology (Shandong) Co., Ltd.<\/a>
As one of the most professional six-axis collaborative robot manufacturers and suppliers in China, we’re featured by quality products and good service. Please rest assured to wholesale bulk customized six-axis collaborative robot from our factory. For pricelist and quotation, contact us now.
Address: Jinghua Road, Economic and Technical Development Zone, Dezhou City, Shandong Province
E-mail: liujiqing@xinweilaiznkj.com
WebSite: https:\/\/www.xinweilaiznkj.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

If you\u2019re in the industrial automation space, you\u2019ve probably seen a six-axis cobot work its magic\u2014whether … How does a Six – Axis Collaborative Robot deal with external forces?<\/span>Read more<\/a><\/p>\n","protected":false},"author":197,"featured_media":602,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[565],"class_list":["post-602","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-six-axis-collaborative-robot-4c87-95dcd7"],"_links":{"self":[{"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/posts\/602","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/users\/197"}],"replies":[{"embeddable":true,"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/comments?post=602"}],"version-history":[{"count":0,"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/posts\/602\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/posts\/602"}],"wp:attachment":[{"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/media?parent=602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/categories?post=602"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.divrigidernegi.com\/blog\/wp-json\/wp\/v2\/tags?post=602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}