Cobot Machine Tending: A Starter Guide for Indian CNC Shops

For many Indian machine shops, the first and best job for a collaborative robot is machine tending: loading raw parts into a CNC machine, lathe or press, and unloading finished ones. It is repetitive, easy to measure and often keeps a skilled operator tied to one machine. This starter guide explains how cobot machine tending works and how to plan your first cell.

Why machine tending is a great first cobot project

• Repetitive and predictable: the same pick, load, close, cycle and unload, again and again.
• Easy to measure: spindle utilisation, parts per shift and labour hours tell you the payback clearly.
• Frees skilled people: operators can run several machines, handle setups and do quality checks.
• Extends running hours: a cobot can keep a machine running through breaks and shift changes.

What a machine tending cell looks like

• A cobot arm mounted on a stand or a mobile base next to the machine.
• A gripper suited to your parts: often a two-finger or dual gripper so it can unload a finished part and load a raw one in one visit.
• A part presentation system: trays, drawers, a fixture plate or a simple conveyor.
• Machine interface: signals between the machine and the robot for door open/close, chuck clamp and cycle start, usually via digital I/O.
• A risk assessment and any safeguarding needed for the application.

Choosing the right cobot

• Payload: part weight plus gripper weight, with margin.
• Reach: from the robot base to the chuck or vice and to the part trays.
• Repeatability: how accurately parts must be placed in the fixture.
• I/O: enough digital inputs and outputs to talk to the machine and gripper.
• Protection: coolant mist and chips call for a suitable IP rating.

The Elfin and Elfin-Pro cobots from MROBOTICS cover payloads of 3–15 kg and reaches of 590–1,800 mm, with repeatability from ±0.02 mm and a control box offering 16 digital inputs and 16 digital outputs. Elfin-Pro has IP66 protection, useful around coolant. For tending several machines with one robot, the Star Mobile Manipulator puts an Elfin arm on a mobile vehicle.

Planning your first cell, step by step

1. Pick the right machine: a stable, high-volume part with long enough cycle times for the robot to load and unload.
2. Record the baseline: parts per shift, spindle utilisation, operator time per part.
3. Design part presentation: how many parts can the robot reach without a refill, and how long will that run?
4. Select gripper and robot: check payload and reach with real parts.
5. Plan the machine interface with your machine supplier or maintenance team.
6. Carry out a risk assessment for the whole cell.
7. Program and test with graphical programming, then run a pilot shift.
8. Measure and scale: compare with the baseline, then plan the next machine.

Common mistakes to avoid

• Choosing a robot by payload alone and forgetting the gripper’s weight.
• Poor part presentation that forces the operator to refill trays constantly.
• Starting with the most complex part instead of the simplest high-volume one.
• Skipping the risk assessment because “it’s a cobot”.

Frequently asked questions

Can one cobot tend two machines?

Yes, if the machines are close enough and cycle times allow, or by using a mobile manipulator that moves between them.

Do I need a robot programmer?

Graphical programming makes simple tending cells approachable for trained in-house staff, though help with the first setup is recommended.

Planning your first cobot cell? Talk to MROBOTICS, or read our introduction to cobots in India.