A machine shop wants useful spindle time, consistent loading and a predictable operator workload. Buying an arm does not automatically solve part presentation, door control or inspection. Treat CNC tending as a complete workcell project, starting with one stable part family and an explicit acceptance test.
Specify the part family and machine interface
List part dimensions, mass, hot or sharp surfaces, oil and coolant conditions, and orientation changes. Include jaw geometry and where the robot can safely grip a finished part. Document door, chuck and cycle-start signals with the machine builder or integrator. Do not assume that an advertised robot interface means your particular CNC can be connected without additional work.
Build the full load-to-unload sequence
The sequence includes presenting stock, opening the machine, confirming a safe state, unloading, loading, closing and verifying cycle start. Plan trays, a conveyor or another replenishment method. Include handling of chips, a missed pick and an occupied output position. Tool changes, cleaning and manual inspection may still limit unattended operation.
Evaluate cycle time and economics honestly
Separate robot handling time from machining time and operator replenishment. Measure representative parts, not just an empty-arm movement. Calculate annual benefit from your measured usable hours and contribution margin, then subtract tooling, integration, service and operating costs. There is no universal payback period; a supplier demonstration must be translated into your own production assumptions.
Use a mixed-shift acceptance test
Ask for a pilot with normal stock variation and deliberate recoverable faults. Include restarts after a pause and an operator changeover. Agree on first-pass loading success, acceptable damaged parts, recovery time and intervention frequency before sign-off. A collaborative arm still requires a risk assessment of the complete cell, including the machine and gripper.
Resource shortlist
Ordered by workflow, not by measured performance. These are editorial starting points. Follow each directory entry to its official documentation and confirm the exact configuration before purchasing.
Universal Robots UR5e →
An arm candidate to discuss with a machine-tending integrator for appropriately sized parts.
Check before committing: Reach inside the machine, combined gripper-and-part load and the complete guarded or assessed cell layout.
FANUC CRX →
A collaborative-arm family to consider alongside your existing factory support ecosystem.
Check before committing: Exact model, CNC integration, tooling and local commissioning support.
DOBOT Collaborative Robots →
An additional arm supplier to include when comparing task-specific integration proposals.
Check before committing: Controller interfaces, spare-parts support and an actual cycle using your parts.
Robotiq 2F Grippers →
A gripping resource for studying adaptable parallel gripping within a complete cell.
Check before committing: Jaw geometry, coolant suitability, grip verification and tool compatibility with the selected arm.
Turn the shortlist into a decision
Write down the task, operating conditions, success criteria and total ownership costs. Ask shortlisted suppliers to demonstrate your representative task, including failure recovery. Use the same acceptance test for each candidate.
Explore the full robotics directory →