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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteWhen a factory robot drops, misses, cross-threads, or incorrectly tightens a bolt, match the failure to the controller result before changing settings. Check the fastener and joint, feeder and bit engagement, approved tightening recipe, robot pose, and mounting in that order. Do not raise torque limits or suppress a failed result until you know what went wrong: the safe settings depend on the robot, driver, fastener, joint, and validated process.
Start with the exact failure
“Incorrect installation” can describe several different events, and each points to a different part of the process. Robotiq’s Screw Feeder manual uses labels including “Screw dropped,” “Torque value reached before reaching final position,” “Screwdriving failed,” and “Feeder not ready.” Match the event you observed to the controller’s exact alarm and fastening result rather than treating every NOK as a torque problem. Robotiq’s Screw Feeder documentation
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Before changing anything, record the alarm, the fastener location, whether the robot completed the commanded motion, and the torque and angle trace if the system provides one. Compare a failed cycle with a good cycle at the same location. This helps separate a missing feed, a thread-entry or seating problem, a torque-monitoring result, and a robot-position issue.
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Inspect the bolt or screw, its driver recess, the threaded hole, and the mating surfaces. Look for a wrong or damaged fastener, debris, damaged threads, a broken screw, or incomplete seating. Robotiq identifies damaged threads, screw failure, and a manufacturing defect as possible causes when torque is reached before the screw reaches its final position; those are possibilities to inspect, not a diagnosis. Robotiq’s Screw Feeder documentation
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A torque timeout or abnormal torque-and-position result does not by itself identify the defective component. Where the approved procedure allows it, compare the joint with a known-good fastener and process. Do not force a fastener that has started crooked; follow the site’s approved method for removing and inspecting it.
Check feeding and driver engagement
Confirm the fastener reaches the pickup point
For a feeder-based system, verify that the feeder reports ready and that the fastener travels fully to the pickup or driving position. A dropped screw, blockage, or misfeed can look like a robot placement failure if the robot continues its programmed motion without a fastener.
Atlas Copco’s documented screw-feeding head includes a feeding tube and ring sensor to detect a screw at the tube end, a bit-retracted sensor, a stroke-position sensor, aligning jaws, and a bit. These components give maintenance staff specific places to inspect when the symptom or sensor status points to a feed or engagement problem; use the manual for the exact system’s fault codes and service procedure. Atlas Copco screw-feeding systems
Inspect the bit, jaws, and alignment
Check for a worn or damaged bit, a screw that is not aligned with the jaws or driver, and anything preventing the bit from retracting or taking the expected stroke. If the bit turns without engaging, or the screw tilts before entering the hole, focus on physical alignment and engagement before changing torque settings.
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Make the feeder safe before clearing it
Robotiq instructs users to switch off and unplug its Screw Feeder before troubleshooting, and to clear a blockage with the device turned off. Apply the isolation and robot-cell safety procedure for the exact equipment and your site before reaching into a feeder or work cell; those steps are machine- and site-specific. Robotiq’s Screw Feeder documentation
Review the approved fastening recipe
Once the fastener, joint, feed, and engagement are checked, compare the programmed recipe with the approved process. Verify the tightening direction, driver and bit selection, target torque and angle limits, rundown monitoring, and any soft-start or rehit-detection settings. Do not substitute a manual’s example defaults for the validated settings for your joint.
Atlas Copco documents soft start as a way to set speed, maximum torque, and spindle rotation angle to help a screw enter its thread. Its Power Focus documentation also describes rehit detection, which can identify an attempt to tighten a screw that is already tight. These functions may help reveal or prevent particular fault patterns, but their correct values depend on the joint and validated process. Atlas Copco Power Focus 6000
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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →An OK result from a controller is not, by itself, proof of joint quality unless the process’s validated acceptance method says it is. Treat torque and angle traces as diagnostic evidence within that method, not as permission to bypass a failed result.
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- Multiple Uses: These machine Phillips Pan Head Machine Screws are made for electricians, lab technicians, and DIY electronics hobbyists who need lightweight, non-conductive fastening. Suitable for securing industrial machines, sensors, structure beam, robotics components, and assemblies across lab, factory, and DIY projects
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Check robot pose, tool setup, and torque reaction
Tightening torque can push back on the robot. Universal Robots explains that reaction torque and joint-axis orientation can contribute to joint deviations or protective stops. Where the application allows, its High Torque Screwdriving Application Guide recommends avoiding a tightening axis close to parallel with robot wrist axes and recommends at least a 30-degree angle between Wrist 3’s rotational axis and the tightening axis. This is guidance for the guide’s robot and tool context, not a universal pose requirement. Universal Robots High Torque Screwdriving Application Guide
Check tool mounting, the tool center point (TCP), bracket stiffness, cable and air routing, and the robot’s permitted load and torque envelope against the exact robot and end-effector manuals. If the robot uses Universal Robots e-Series screwdriving functionality, the guide also says to check that the robot is in steady mode before starting the screwdriver. That instruction is specific to the stated vendor functionality; other brands and control versions can differ.
Verify mounting after maintenance or a repeatability change
If bolt placement or repeatability changed after service, check that the robot base, tool flange, bracket, and workpiece fixture are clean, aligned, and secured according to their respective manuals. A loose or crooked mount can shift the tool path, even when the fastening program itself has not changed.
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Mounting torque is machine-specific. For example, Seiko Epson’s C-C series manual, Revision 2, gives these set-screw values for that robot series: Epson C-C series manual, Revision 2.
| Fastener in Epson C-C manual | Specified torque |
|---|---|
| M4 | 2.4 ± 0.1 N·m |
| M5 | 3.9 ± 0.2 N·m |
| M6 | 8.0 ± 0.4 N·m |
Those figures are examples for the specified Epson C-C application, not recommended robot-mounting values for other models. The manual recommends tightening circular bolt patterns in a criss-cross order over two or three rounds, then using a torque wrench or similar tool at the specified torque. Follow the exact equipment maker’s procedure rather than a generic torque chart. A calibrated digital torque wrench can support checks where the procedure calls for it; it will not test the robot’s automated fastening trace or diagnose a feeder, bit, thread, or program fault.
Quick Recap
Know when to stop and escalate
- Stop the process and involve qualified maintenance or integration personnel if faults recur, the robot moves unexpectedly, or a protective stop occurs during tightening.
- Use the equipment maker’s documentation and your site’s isolation procedure before servicing a feeder, driver, robot, or cell.
- Do not loosen torque limits, disable monitoring, or accept repeated NOK results as a workaround. First establish whether the failure is in the part, feed, tool engagement, recipe, robot pose, or mounting.
- Use only the mounting torque and fastening acceptance limits approved for the specific robot, tool, fastener, and joint.
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