Engineering selection guide
A robot pedestal can carry the robot’s weight and still be unsuitable for the application. Motion accuracy, vibration, repeated load cycles and the floor connection can govern the design. A useful review follows the complete load path from the robot mounting face to the supporting structure.
Collect forces and moments at the robot base
Obtain the applicable OEM base-load information, mounting orientation, tool/workpiece data and duty cycle. Preserve the stated axes, signs, units and load-case definitions. Separate normal operation from stopping cases. Use the specified load combinations and establish whether quoted loads already include margins; do not reduce published design loads without an approved engineering basis.
The Universal Robots stand guide explicitly distinguishes operation and stopping, and addresses static stiffness, dynamic response and fatigue. These are useful review categories for a pedestal; the actual values must come from the selected robot’s documentation.
Transfer the loads to the floor connection
Express the robot-applied force and moment in the same coordinate system. Basic statics gives Mfloor = Mrobot + r × F, with other applied loads added separately. Here, r is the vector from the floor reference point to the robot-base load point. A horizontal force therefore contributes an additional overturning moment when it acts above the floor.
For illustration only, a 1000 N horizontal force acting 0.75 m above the reference produces an additional 750 N·m moment. This is not a robot load rating or a complete design case. Include offsets, self-weight, tooling and any other loads without counting twice what an OEM load definition already includes.
Check deformation as well as strength
For a uniform cantilever with a fixed base, linear-elastic material and small deflection, elementary beam theory gives δ = FH³/(3EI) for a lateral tip force. Here F is force, H is unsupported length, E is Young’s modulus, and I is the second moment of area about the bending axis. Using N, mm, N/mm² and mm⁴ gives δ in mm. With force, material and section unchanged, doubling H multiplies this bending-deflection term by eight. See the MIT beam-deflection reference. A real pedestal also has plate bending, joint rotation, shear deformation and foundation flexibility; this screening equation cannot validate the assembly.
- Column: bending, shear, torsion, local behaviour and fatigue where applicable.
- Top plate and welds: load distribution from the robot mounting points into the column.
- Base plate: bending, bearing, separation and its influence on anchor forces.
- Dynamic response: the robot, support and connection acting as an assembly, including external vibration.
Design the anchors for the actual floor
Request concrete strength and thickness, reinforcement information, cracks, edges, joints, embedment limits and nearby services. Check combined tension and shear, the relevant concrete and steel failure modes, installation conditions, and suitability for the application’s repeated loading. A floor-hole diameter does not establish an anchor type or capacity.
Use the selected anchor manufacturer’s applicable data and approval with the project’s design method. Hilti’s technical guides, for example, separate anchor-system data and concrete-connection design guidance. Product availability and the approved installation conditions must match the final specification.
What to include in an engineering enquiry
Send the exact robot, loads and duty, seating height, permitted footprint, layout, performance requirement and available floor information. Ask for the material and connection assumptions, inspection requirements and design responsibilities to be stated with the released drawing.
Build a trial pedestal configuration to communicate the starting geometry. The STEP and dimensional PDF support layout discussion; they are not a stiffness calculation, anchor design or production release.