Reaching too far, a bent wrist, a label you can barely read: details like these cost cycle time and quality. Stable assembly depends heavily on how grab containers are laid out, meaning short paths, a neutral posture, a clear view, and smooth material supply. If you plan the ergonomics of grab containers in assembly deliberately, you keep workflows safe and efficient.
Ergonomic grab containers keep the grasping path short, the wrists neutral, and the view clear. Plan the grasping area in zones: the A zone is directly in front of the body and meant for the most frequent grasps, the B zone adjoins it, and the C zone lies at the edge of the reach. Frequent grasps belong in the A and B zones. Horizontally, that usually means 350 to 450 mm of reach in practice, vertically a grip height of about 800 to 1,200 mm. You use the C zone for rare grasps or for heavier parts that are better placed lower. The more often a part is grasped, the more central and closer its container should be. This stabilizes the cycle time and avoids unnecessary grip changes.
Posture stays steady when the wrist isn't strongly flexed or bent and the load stays close to the body. As a guide value for a single grasp, stay below 1.5 kg. If parts are heavier, grasp with both hands or use aids. Light parts sit well at a height of about 900 to 1,100 mm, heavier ones rather at 750 to 900 mm. Tilting the container by 15 to 30 degrees brings the contents into view, lets parts slide forward, and shortens the grasping path, as long as the front edge doesn't become a barrier.
Visibility and quality go hand in hand. Labels should be readable without turning the head; in practice, an angle of about 30 to 45 degrees to the line of sight helps. Rounded edges, suitable inserts, and clear dividers prevent pressure marks, mispicks, and mix-ups. If protection against electrostatic discharge (ESD) matters, conductive containers and grounded flow racks provide safety. This keeps the assembly workstation robust, even during variant changes.
Proven guide values give you a reliable grid:
Target values help with steering: keep the total grasping path per cycle below 350 cm if possible, and reduce the number of grip changes to dampen fluctuations in cycle time.
Mistakes often arise from positions that are too high or too low and from reaches beyond 450 mm. This forces the upper body to lean forward or the shoulder to lift, and it lengthens the paths. Bent wrists, sharp-edged container rims, and lines of sight blocked by high stacks are just as critical. Mixed parts, missing FIFO, and replenishment that crosses the grasping hand cause search times and mispicks.
The remedy is clearly assigned zones, soft grasping edges, tilted containers in the 15 to 30 degree range, and material supply that doesn't cross the grasping area. The two-container principle has proven itself: one container is in use, the second stands ready and is swapped outside the central zone.
A scenario: A workstation starts with 480 cm of grasping path per cycle, frequently grasped parts sit to the side, and labels can only be read after turning the head. After switching to a central arrangement, a 20-degree tilt, and a grip height of 950 mm, the grasping path drops to 320 cm, grasp time falls by around 10 percent, and mispicks decrease noticeably. Before-and-after comparisons like this show how strongly reach zones, field of view, and tilt interact.
Start with material supply. Flow racks with roller tracks and a tilt of 15 to 30 degrees secure FIFO flow if the outlet edge is easy to grasp and doesn't lengthen the path. Align the labels so they are in the field of view, and keep routes clear; minimum widths follow from the German technical rules for workplaces (ASR) and your plant standard. Separate replenishment routes from the grasping area so that the grasping hand isn't blocked, and arrange frequently used parts consistently in the center. This keeps material supply in assembly ergonomic and reliable.
For validation, measure instead of estimating. Key metrics are:
Set clear goals, for example 20 percent less grasping path and 10 percent less grasp time, and document before and after with comparable batch sizes. This makes decisions reliable and transferable to other workstations.
Planning in VR speeds up these loops. Halocline is the planning platform for production layouts and workstations. With no training required and without CAD data, you build the workstation from library elements, including load carriers for material planning. Grasping area avatars show the optimal and maximum grasping area and the working planes for the body height you set, calculated according to DIN 33402-2 and DIN EN ISO 14738. This lets you check grip height as variants, for example at 850, 950, and 1,050 mm, and compare tilts in 5-degree steps between 15 and 30 degrees. You measure distances with the measuring tool. If you run through the workflow in VR and record it, the recording provides paths and times, and the ergonomics analysis based on the key indicator method shows problematic object movements. You spot fields of view and collisions with edges or roller tracks early. You adjust layout, container angles, and distances quickly and discuss the variants with your team. This is how you plan the grasping area ergonomically and check it realistically instead of rebuilding for a long time.
Sanner shows what this looks like in practice: together with item and Halocline, assembly workstations for a medical technology product with ESD requirements were tested and optimized in VR before they were built, with up to 20% shorter process time.
Want to arrange your grab containers ergonomically before you rebuild? Get started for free with Halocline Free and build your first workstation in 3D. For process analysis and the ergonomics check, get in touch and we'll show you the right scope.
