In vertical lathe work, manual loading and unloading usually consists of:

• Blank onto the loading conveyor
• Part located
• Spindle moves down to pick
• Spindle moves up and clamps
• Machining area closes
• Turning
• Spindle moves down to unload
• Part drops to the discharge conveyor
• Clean and 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 loading and unloading carried out by the spindle itself, a stable cycle per part and chips and center of gravity falling downwards — which is exactly what makes the repeated motions worth fixing.

Taking EMAG as the example: The inverted vertical structure of an EMAG lathe means the spindle itself picks the part up: the workpiece is taken straight from the conveyor or the pallet and machined. External automation therefore concentrates on continuous feeding along the loading conveyor, separating the discharge and transferring between machines.

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 EMAG vertical lathe 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. Loading conveyor or pallet location
3. Spindle moves down and picks the part
4. Spindle moves up and clamps the part
5. Machining area closes
6. Vertical turning
7. Machining complete
8. Spindle moves down and unloads
9. Part drops onto the discharge conveyor or pallet
10. Inspection and sorting
11. The next part enters the cycle

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

• Has the part reached the loading position
• Has the spindle picked it correctly
• Is the chuck clamped
• Is the machining area closed
• Has the machining program finished
• Has the part dropped to the discharge position
• Is there chip or coolant build-up at the unloading station

The part is brought to the lower station by conveyor or pallet and the spindle moves down to pick it up and up into the machining area, so the spindle down travel, the height of the loading station, the conveyor position and the guard opening range 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 EMAG vertical lathes have cycles, part sizes and a layout that suit shared feeding, the following can be designed:

1. Storage magazine
2. Gantry or robot
3. vertical lathe 1
4. vertical lathe 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 vertical lathe, 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 vertical lathe the clamping form is the spindle chuck, and the system has to consider:

• Vertical spindle chuck type and size
• Gripping face and soft-jaw design
• Part locating datum
• Spindle pick-up present detection
• Clamp confirmation signal
• Interference between the loading conveyor and the spindle travel
• Discharge drop and damage protection
• Chip and coolant build-up at the unloading station

Typical working cycle:

1. Part reaches the loading position
2. Spindle moves down
3. Spindle picks the part
4. Spindle moves up
5. Chuck clamped
6. Machining area closed
7. Machining
8. Spindle moves down and releases

The machine only moves to the next state after the clamped condition is confirmed. Because the part is picked from below, the loading station has to be free of chip and coolant build-up, which is what actually limits 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 spindle down travel, the loading station height, the cycle, the number of machines 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.