Non-Standard Automation Equipment Design: From Spec to Handover

The non-standard automation equipment is the machine that is designed for one customer, one part, and one process. The standard catalog does not cover it, the handbook does not predict it, and the first prototype is the real test. This article covers the design workflow for the non-standard automation equipment, from the specification to the handover, and the habits that keep the project on schedule.

The Specification Is the Contract

The non-standard equipment starts with the specification, and the specification is the contract between the customer and the design team. The specification that is vague is the specification that produces the arguments at the acceptance.

The specification covers the process requirements, the cycle time, the part geometry, the quality requirements, and the environment. The cycle time is the number that drives the whole design: the faster cycle needs the faster axes, the lighter moving parts, and the more careful dynamics.

The specification also covers the boundary: the input and the output of the machine, the interface with the upstream and the downstream equipment, and the utilities that are available. The machine that is designed without the boundary is the machine that does not fit the line.

The specification should be written, reviewed, and signed. The verbal agreement is the agreement that is remembered differently by the two sides. The signed specification is the baseline that the changes are measured against.

The Concept Phase

The concept phase explores the ways to do the job. The process can be done with the rotary table or the linear transfer, the servo press or the pneumatic press, the vision system or the mechanical registration.

The concept selection is the decision that sets the cost and the risk. The standard concept with the proven components is the low-risk choice. The novel concept with the custom mechanism is the high-performance choice with the higher risk.

The concept is evaluated against the specification: the cycle time, the accuracy, the cost, and the reliability. The concept that meets the specification with the margin and the lowest risk is the concept that is developed.

The concept review is the team event. The design, the manufacturing, the assembly, and the customer representatives review the concept together. The review that catches the problem at the concept stage is the review that saves the month at the end.

The Detailed Design

The detailed design develops the chosen concept into the machine. The mechanism is designed with the kinematics and the forces, the frames are sized, the actuators are selected, and the control system is specified.

The detailed design uses the standard components as much as possible. The linear guides, the ball screws, the motors, the sensors, and the pneumatic components are the catalog parts that are selected from the manufacturer data. The custom parts are limited to the parts that the standard cannot cover.

The detailed design is a parallel effort. The mechanical design, the electrical design, and the software design proceed together with the interfaces defined. The interface that is defined early is the interface that does not change late.

The design review is held at the milestone. The review checks the mechanism against the forces, the frame against the deflections, the actuators against the loads, and the safety against the standards. The review that is held before the fabrication is the review that prevents the rework.

The Risk Management

The non-standard equipment carries the risks that the standard product does not. The new mechanism may not work as predicted, the new process may not hold the tolerance, and the new software may have the bugs.

The risk is managed with the mitigation. The high-risk mechanism is prototyped early. The critical process step is tested with the sample parts. The software is tested with the simulation and the dry runs.

The risk is also managed with the buffer. The schedule that has no buffer is the schedule that fails at the first problem. The budget that has no contingency is the budget that fails at the first change. The buffer that is planned is the buffer that is available when the problem arrives.

The Build and the Assembly

The build phase turns the design into the machine. The parts are fabricated, the standard components are procured, and the machine is assembled. The build is the phase where the design errors surface.

The fabrication follows the drawings, and the drawings are checked before the release. The part that is fabricated from the wrong drawing is the part that is scrapped. The drawing that is checked by the second engineer is the drawing that is right.

The assembly follows the assembly plan. The machine is assembled in the logical sequence: the base, the frame, the axes, the actuators, the sensors, the guards, and the wiring. The assembly that follows the plan is the assembly that is easy to troubleshoot.

The Commissioning

The commissioning is the phase where the machine comes alive. The power is applied, the axes are homed, the software is loaded, and the machine runs the first cycles.

The commissioning follows the sequence from the safe to the complex. The individual axes are tested first, then the coordinated motion, then the process cycle, then the full automatic run. The test that is done step by step is the test that is easy to diagnose.

The debug is the reality of the commissioning. The axis that overshoots, the sensor that triggers late, the part that jams in the chute, and the cycle that runs long are the problems that are found and fixed. The debug that is structured is the debug that is fast.

The Acceptance and the Handover

The acceptance is the formal test against the specification. The machine runs the cycle time, produces the parts within the quality, and operates reliably for the acceptance run. The acceptance that is passed is the acceptance that is documented.

The handover includes the documentation: the drawings, the manuals, the spare parts list, and the maintenance schedule. The documentation that is complete is the documentation that keeps the machine running after the design team leaves.

The training is part of the handover. The operator is trained on the daily operation, the maintenance crew is trained on the service, and the engineering team is trained on the adjustments. The trained team is the team that keeps the machine productive.

Conclusion

Non-standard automation equipment design is the discipline of the controlled uncertainty. Write the specification as the contract, explore the concepts and select the low-risk option, develop the detailed design with the standard components, manage the risks with the early prototypes and the buffers, build and assemble to the checked drawings, commission step by step, and hand over with the documentation and the training. The non-standard machine that is designed with the process discipline is the machine that meets the specification, and the met specification is the profit of the project.

A Worked Example: The Small Assembly Station

A small assembly station shows the workflow in practice. The customer needs a station that presses two components together, verifies the press force, and sorts the good and the bad assemblies. The cycle time is six seconds, and the volume is one million assemblies per year.

The specification is written: the part geometry, the press force range, the verification method, the cycle time, and the interface with the existing line. The customer signs the specification, and the baseline is set.

The concept phase compares the options. The pneumatic press with the load cell is the standard concept, and the servo press is the high-end option. The pneumatic concept meets the force range and the cycle time at the lower cost, and the concept is selected.

The detailed design develops the station. The rotary index table brings the parts to the press station, the pneumatic press with the load cell presses the assembly, and the PLC with the HMI controls the cycle. The standard components are selected from the catalogs: the rotary table, the press, the load cell, and the sensors.

The risk review identifies the press force variation as the risk. The prototype of the press station is built early, and the sample parts confirm the force range. The software is developed with the simulation, and the dry runs test the logic.

The build and the assembly follow the drawings. The station is assembled, wired, and commissioned. The axis tests, the press test, and the full cycle test are run step by step. The debug fixes the sensor timing and the part feed.

The acceptance runs the full shift: the cycle time holds at six seconds, the force verification passes, and the sorting is correct. The station is handed over with the documentation and the operator training. The station runs in production, and the customer orders the second station.

The Project Management

The non-standard equipment project is managed with the milestones and the reviews. The milestones are the specification, the concept, the detail design, the build, the commissioning, and the acceptance. The reviews are held at each milestone, and the gate is the approval to proceed.

The schedule is built from the milestones with the durations. The critical path is the sequence of the tasks that determines the total duration: the custom mechanism, the long-lead components, and the commissioning. The critical path is protected with the buffer and the expediting.

The budget is tracked against the estimate. The hours and the material are recorded per task, and the variance is reviewed weekly. The budget that is tracked early is the budget that is corrected early.

The Documentation

The documentation is the deliverable that outlives the project. The drawings, the bills of material, the manuals, and the test reports are the records that the customer keeps.

The drawing set includes the assembly drawings, the part drawings, the pneumatic diagrams, the electrical diagrams, and the software documentation. The drawing set is complete and consistent: the part numbers match, the revisions are current, and the cross-references are correct.

The manual covers the operation, the maintenance, and the troubleshooting. The manual is written for the operator and the maintenance crew, not for the design team. The manual that is tested against the machine is the manual that works.

The Cost Control

The cost is the second measure of the project, after the function. The estimate is the baseline, and the actual cost is tracked against the estimate. The hourly rate, the material price, and the purchased component prices are the main cost drivers.

The design choices decide the cost structure. The custom machined plate is replaced with the standard profile, the purchased PLC is kept as the standard brand, and the custom tooling is minimized. The standard components are cheaper, available faster, and easier to replace in the field.

The cost review is held with the schedule review. The overrun is flagged early, and the correction is chosen with the customer: the simplified mechanism, the extended schedule, or the changed scope. The project that tracks the cost openly is the project that avoids the surprise invoice.

The Continuous Improvement

The non-standard equipment is the starting point, and the second machine is the improved machine. The field data from the first machine is the input for the second design: the failure modes, the maintenance items, and the operator feedback.

The improvement is captured in the lessons-learned review. The review covers the design mistakes, the project management issues, and the customer communication problems. The lessons are documented and applied to the next project.

The standard library is the accumulation of the projects. The proven mechanisms, the standard panels, and the reused modules are the building blocks of the next machine. The team that builds the library builds the speed.