Programming Principle

Load the machine

It is recommended in GO2cam to have the machine loaded first, ideally with an FMO.

Due to the complexity of these machines, typically in machine shops, the settings and tool positioning in the machine will be changed very rarely. Having the FMO of the actual mounted tool will ensure proper machining cycles definition.

On opening the module, this window is prompted where we can select a machine if we have one defined, as the first step. A blank project is opened with the machine already loaded.

Part positioning

The position of the part is highly dependent on the machine being used; its kinematics, available machining length, racks positioning and tools loaded.

Generally, majority of turning operations is to be done on the main spindle.

Any outside turning operation on the rework spindle is to be done with a boring cutter.

Machining practice

Programming the machining cycles is no different to Turnmill operations. Where is differs is the geometry on which it is applied. While for a turning cycle (roughing/finishing) the operation can be applied on the full length of the machinable part, this is to be avoided for Swiss type machining.

The machining is carried out in such a way so as to prevent the machined bar from retracting too much into the guide bush.

1. If the bar retracts too much (bar leaving the guide area), there is the risk of the bar no longer being able to re-enter the guide bush during the next advance and also potentially damaging the machine.

2. The bar, having been machined, may have burrs, which could lead to damage to the guide bush during retraction.

As such, machining is done by splitting the part into several sections. The maximum operations applicable are then programmed section by section.

In GO2cam, the Slice the part command in provided to assist in the sectioning of the part and on application of an opelist, the operations are calculated for each section.

On the machine, the operations are carried out progressively as the material advances.

Stock/Spindle Positioning

The position of the stock is important so as to optimize the motion of the bar throughout the machining process.

Typically it is recommended to have the value of the Stock Overrun be at least the value of SL as shown on the right.

The distance values are automatically read from the project file and the machine kinematics. The advantage of using an FMO is also projected here where the width of the parting tool and its allowance can be automatically read and the recommended SL value is proposed.

For more details on the main chuck positioning, click here.

1. Selecting the machine

To begin programming a Swiss machining center, the first step is to select the specific machine model. The programming process varies depending on the machine's configuration.

The machine file includes an .FMO file, signifying pre-mounted tools. Using .FMO files is the recommended practice in GO2cam for Swiss machining.

2. Import and Positioning

Once the machine file is loaded, the next step is to import the workpiece, making sure it's correctly oriented.

To prevent collisions and ensure sufficient clearance during machining, we'll create a safety area around the workpiece.

3. Slice the part

Slicing divides the workpiece into smaller, manageable sections, enabling precise control and efficient toolpath generation. Each zone should be machined gradually, as determined by the Z-value.

To create slices on the workpiece, we need to specify the desired slice length. In this case, we'll use a 25 mm slice length. This will divide the workpiece into multiple zones.

We can adjust the position of these slices manually by inputting values or by directly moving the white line on the interface.

4. Application of Auto-Opelist

Applying an auto-opelist to the sliced workpiece. The opelist automates operations and cutting conditions.

5. Collet Positioning

• Stock Chuck Settings: Adjust the collet position based on the parting tool width.

• Overrun Distance Calculation: Considers facing, part length, parting allowance, tool width, and safety factors. It's larger with a guide bush due to the increased distance between the parting tool and spindle nose.

6. MTE Simulation

Simulating the MTE (Machine Tool Equipment) can help verify the toolpaths, speeds, and feeds, ensuring that the tools are used effectively.