In turn-mill machine work, manual loading and unloading usually consists of:

• Pick the blank
• Locate the part
• Main chuck clamping
• Close the machine door
• Turning and milling
• Sub-spindle pick-up
• Back-end machining
• Remove the finished part
• Clean and self-check
• Prepare the next part

When the cycle is stable, the part range is fairly uniform and the machine runs for long stretches, those repeated motions can be joined by an automation system. The machining characteristic here is turning, milling and drilling completed in one clamping, with long cycles per part and strongly coupled operations — which is exactly what makes the repeated motions worth fixing.

Taking DMG MORI as the example: DMG MORI was formed by merging DMG and MORI SEIKI and already supplies automation and pallet systems of its own. A third-party loading system has to be defined against those original interfaces first, so that investment is not duplicated and signals do not conflict.

The system does not simply put a robot where an operator stood. It makes the following run in a fixed order:

1. Feeding
2. Picking
3. Clamping
4. Machining
5. Unloading
6. Collection

Add automated part storage and frequent manual replenishment turns into:

1. Storage buffer
2. Automatic feeding
3. Robot picking
4. CNC machining
5. Finished-part collection

The concept for a DMG MORI turn-mill machine therefore has to be designed from the whole production cycle, not from a robot model number.

A typical automatic cycle can be designed as:

1. Blank in
2. Storage magazine or automatic feeding
3. Part location
4. Gantry robot or six-axis robot picks
5. Into the DMG MORI turning center
6. Automatic door opens
7. Robot places the part
8. Main chuck clamps automatically
9. Machine confirms the clamped state
10. Turning and live-tool milling
11. Sub spindle picks up and completes the back-end operations
12. Machining complete
13. Automatic door opens
14. Robot removes the finished part
15. Finished part collected or passed to inspection
16. The next part enters the cycle

Each of those motions needs its own state confirmation, for example:

• Is the part in position
• Did the robot pick successfully
• Are the main chuck and the sub spindle clamped
• Is the live turret in a safe position
• Does the machine allow the door to open
• Are the main and sub-spindle operations complete
• Was the finished part removed

The robot enters from the front of the main chuck and the sub spindle takes over where the part has to be handed across. The clamping space in front of the main chuck, the live turret and tool holder positions, the sub-spindle travel and the guard door opening range all have to be confirmed in the design.

The stability of an automatic system comes from the interlocks between those states, not from robot speed alone.

01 Gantry robot loading and unloading

A gantry robot normally runs on a fixed path. It suits: machines that stay in position and stand in a row, a clear loading path, a fairly stable part range with continuous batches, a defined cycle, and one robot serving several machines. Typical structure: automated part storage → gantry robot → machine → finished-part collection.

02 Six-axis robot loading and unloading

A six-axis robot has a larger working envelope. It suits: handling motions that are complex or need the part flipped, several machines plus an inspection station, a wide part range with frequent changeover, and connecting deburring, washing or inspection. Typical flow: storage → robot → machine → robot → inspection or finished-part area.

03 Automated part storage and feeding

Automated part storage is the link that turns manual bar handling into buffering: blanks queue in the magazine and the robot takes them to the cycle, so replenishment becomes a scheduled batch job instead of a per-part one. It suits sites that want to lengthen the replenishment interval, a fairly uniform part range that can be supplied by tray or basket, night shifts or long unattended stretches, and several lathes sharing one feeding and collection route.

Choosing between them

The handling unit and the feeding method are two separate decisions: they can be chosen independently or combined.

When two DMG MORI turn-mill machines have cycles, part sizes and a layout that suit shared feeding, the following can be designed:

1. Storage magazine
2. Gantry or robot
3. turn-mill machine 1
4. turn-mill machine 2
5. Finished-part collection

That forms one multi-machine automation cell. A one-to-two configuration has to be calculated on:

• The cycle time of both machines
• The robot pick-and-place time
• The door opening time of both machines
• The part weight
• The robot payload
• The robot travel
• The distance between the two machines
• The storage capacity
• The scheduling logic when both machines finish at the same time

Not every pair of machines can share one robot. If the two cycles differ widely, or the machines stand too far apart, the robot path, the buffering method and the feeding structure have to be re-assessed.

Whether a part suits automated loading is decided by the part first. Across the typical work of a turn-mill machine, the common candidates are:

Whether a specific part suits automatic loading has to be confirmed on size, weight, shape, material, cycle time, clamping method, locating datum and the pose it arrives in. A name such as "shaft" or "disc" on its own is not a conclusion.

In automated loading the machine fixture is a critical link. On a turn-mill machine the clamping form is the main chuck plus the sub spindle, and the system has to consider:

• Main chuck and sub-spindle chuck type
• Soft-jaw and gripping-face design
• Part locating datum and axial stop
• Clamp confirmation signals for main and sub spindle
• Part-present detection
• Interference between the live turret, the robot and the sub spindle
• Space for the sub-spindle pick-up
• Chip and coolant environment

Typical working cycle:

1. Robot picks the part
2. Enters the machine
3. Part located
4. Placed in the main chuck
5. Main chuck clamped
6. Clamp confirmed
7. Robot withdraws
8. Machining, then sub-spindle pick-up

The machine only moves to the next state after the clamped condition is confirmed, and the hand-over between main and sub spindle is the point where most process faults appear. Chip breaking and chip evacuation also affect continuous running. Automated loading is therefore not simply "pick it up and put it in".

Neither option is automatically better; the shop decides.

The final choice also depends on the machine layout, the part weight, the cycle, the gripping method, the number of machines, the robot travel and the safety area.

A project lands on the shop floor when these are verified:

01 Part location

Whether the part reaches the pick-up position reliably.

02 Fixture

Whether the robot gripper holds parts in different states reliably.

03 Machine interface

Whether the robot and the machine exchange run states reliably.

04 Cycle time

Whether the robot cycle matches the machine cycle.

05 Exception handling

How the system pauses, resets and recovers from a failed pick, a machine alarm or a part that is not in position.

06 Safety

Safety door, light curtain, safety area, emergency stop, robot safety and the human-robot boundary.

07 Manual takeover

Whether an operator can step in quickly when the automation trips.

A stable automatic system is not only one that completes its motions in normal running: it is one that recovers safely and in a controlled way from an abnormal state.