How to Increase Part Count in a CNC Machine without Running the Full Cycle

Many CNC machines allow for the manipulation of part counts, either manually or through programming. While this can be particularly useful in managing production counts post-processing, it often raises questions about how to increase the part count without running the full program cycle.

Using the Program Control Board

The offset buttons on a CNC program control board provide direct access to part count settings. Follow these steps to manually increase the part count:

Locate the OFFSET button on the program control board. Click the OFFSET button to open the offset menu. Locate the Part Count option within the menu. If the key is on, you can easily edit this value. If it's off, you'll need to change the mode. If the VMC (Variable Motor Control) key is on, select MDI (Manual Data Input) mode to make these changes. Enter the new part count value.

This method is straightforward but may not be necessary if you can find a way to manipulate the part counter through programming.

Modifying Parameter Values

If your CNC machine allows for macro programming, you can directly modify the part count by changing a parameter value. Here’s how:

Refer to the manual to find the parameter that stores the part count. This is often a parameter like 1000. Enter MDI mode to manually input the following code: 1000 NEW_PART_COUNT Replace NEW_PART_COUNT with the desired part count value.

Once you execute this, the part count will update accordingly without running the entire program.

Using End-of-Program M Code

Ending your program with specific M codes can also increment the part count post-processing. Here’s how to do it:

Identify the M code at the end of your program. Common M codes include M02, M30, M22, M2. Replace this M code on the last line with an earlier line in your program. For example, M30 prompt can be replaced with a line before it. When the program reaches the end, it will increment the part count and restart the program from the top.

This method can be particularly useful if you need to count parts in batches or during trial runs.

Understanding Machine Parameters

To fully leverage these techniques, you need to understand your machine’s parameters. Each machine is different, so you’ll need to consult the manual or perform some preliminary testing to identify the specific M codes and parameters used:

Refer to the machine’s manual for a list of parameters. Identify the parameter that controls the part counter (often a parameter like 1000). Check for a parameter that multiplies the part count (e.g., counting 4 parts for an M30 command).

By adjusting these parameters, you can achieve more control over the part count, allowing for efficient management of your production process.

Conclusion

While manipulating part counts in a CNC machine can seem like cheating, it is an essential tool for efficient production management. Whether through the program control board, parameter modification, or altering M codes, these methods can help you achieve the desired part count without running the full cycle. Remember to consult your manual for specific details on your machine.

Keywords

CNC Machine, Part Count, Program Control, M Codes