Why a Custom Machine Builder Was a Better Fit Than a Robot Integrator

Project Overview

An anonymized North American industrial-equipment manufacturer was looking for a Chinese supplier to automate a repetitive assembly process.

The manual operation required an operator to:

• Pick a small stamped component
• Confirm orientation
• Place it into a molded housing
• Seat it with controlled force
• Confirm final position
• Move the assembly to the next process

The buyer initially described the requirement as a robot pick-and-place project.

The First Supplier Search

Several Chinese robot integrators responded quickly.

Their proposals focused on:

• Six-axis robot model
• Payload
• Reach
• Cycle time
• Robot brand
• Cell footprint
• Safety fencing

The proposals looked credible.

However, they did not fully address:

• Bulk-part feeding
• Reliable orientation
• Component tolerance
• Fixture location
• Insertion force
• Seating depth
• Failed-part handling
• Inspection
• Tool wear

The Process Was Mapped Step by Step

The project team reviewed the manual process in detail.

The operator was not simply moving a component.

The operator was also:

• Feeling whether the part was correctly oriented
• Adjusting for slight deformation
• Using resistance to identify poor seating
• Inspecting the final position
• Separating questionable assemblies

These judgment points represented the real automation challenge.

The Robot Was Not the Main Risk

The robot movement was straightforward.

The difficult parts were:

• Presenting the component consistently
• Locating the housing
• Controlling insertion force
• Measuring final position
• Detecting a misloaded part
• Recovering from a feeder jam
• Separating failed assemblies
• Maintaining repeatability over tool wear

This changed the supplier strategy.

Supplier Categories Were Reassessed

Pure Robot Integrators

Strengths:

• Robot selection
• Motion
• EOAT
• Safety
• Programming

Weaknesses for this project:

• Limited feeding ownership
• Weak fixture concept
• Force-control treated as an accessory
• Inspection outsourced
• Limited responsibility for the full process

Custom Machine Builders

Strengths:

• Feeding
• Fixtures
• Indexing
• Force and position control
• Reject flow
• Process sequencing
• FAT

The strongest machine builders could still integrate a robot where useful, but they approached the project as a controlled assembly machine rather than a robot sale.

The RFQ Was Rewritten

The original request for a robot cell was replaced with a process-based RFQ.

Suppliers were asked to explain:

• Feeding concept
• Orientation method
• Fixture design
• Product tolerance assumptions
• Force profile
• Position verification
• Failure detection
• Reject handling
• Cycle-time calculation
• Tool-life expectations
• Controls architecture
• Sample testing
• FAT

The target cycle time was 12 seconds per assembly.

The RFQ also required suppliers to state which parts of the process were proven and which required development.

The Shortlist Changed

Several robot-focused suppliers moved down the list because their proposals depended on:

• Buyer-provided feeders
• Manual recovery
• Simple presence sensors
• Unspecified force control
• Limited sample testing

Two custom machine builders moved forward.

Both asked detailed questions about:

• Stamped-part variation
• Burrs and deformation
• Housing tolerance
• Required insertion force
• Seating depth
• Failed-part definition
• Tool replacement

These questions showed stronger ownership of the actual manufacturing risk.

Recommended Solution Direction

The recommended concept used:

• A bowl or flexible feeder
• Orientation verification
• Precision fixture
• Servo-controlled insertion
• Force and position monitoring
• Presence check
• Automatic reject
• Recipe control
• Production data logging

A small robot remained an option for material handling, but it was not the center of the architecture.

Proposed FAT

The FAT would include:

• Samples from multiple production batches
• Normal and intentionally deformed components
• Minimum and maximum tolerance parts
• Repeated insertion-force monitoring
• Misorientation test
• Missing-part test
• Feeder-jam recovery
• Reject verification
• Four-hour runtime
• Cycle-time confirmation
• Tool-change demonstration
• Software and documentation handover

Case Study Takeaway

The buyer did not need more robot quotations.

The buyer needed the supplier category that could own feeding, fixtures, force, inspection, repeatability, and acceptance.

When the hard part of the project remains difficult without the robot, start with a custom machine builder.