• There are several ways programs can be loaded & ran by CNC machines, which can be divided into the following categories:

  • Local Memory/Access Methods:

    • Manual Data Input (MDI): This involves manually entering the G-code program into the CNC machine's control panel. This method is time-consuming and error-prone, as the operator must enter each line of code accurately. However, it is useful for small, one-off jobs where programming time is not a concern.

    • Removable Storage Device: Some CNC machines have a built-in removable storage device, such as an SD card or CompactFlash card. The G-code program can be saved to the removable storage device and inserted into the CNC machine's control panel. This method is similar to USB storage, but uses a different type of storage device.

  • Remote Memory/Access Methods:

    • Direct Numerical Control (DNC): In this method, the G-code program is stored on a computer or server and transferred to the CNC machine via a wired or wireless connection. This is more efficient than manual data input as the program can be easily updated or modified, and the operator can avoid errors in manual data entry. However, this method can be slower if the network or transfer speed is slow, and there is a risk of data loss if the network connection is lost.

    • Ethernet: This method involves connecting the CNC machine to a network via Ethernet cable. The G-code program can be transferred from a computer on the network to the CNC machine over the network. This method is similar to DNC, but uses a wired connection instead of wireless.

    • Cloud-based storage: In this method, the G-code program is stored on a cloud server and accessed by the CNC machine over the internet. This method is similar to DNC, but uses a cloud-based server instead of a local server.

  • Obsolete Memory/Access Methods:

    • Drip Feed: Drip feed is a method of sending the G-code program to the CNC machine one block at a time, rather than sending the entire program all at once. This is useful when the program is too large to fit in the CNC machine's memory all at once. The CNC machine receives each block of code and executes it before requesting the next block. This method can be slower than other methods, but is useful when the CNC machine's memory is limited or when a large program needs to be run on a machine with limited memory.

    • Tape-Read: Tape-read is an older method of loading G-code programs onto CNC machines, which uses magnetic tape. The G-code program is stored on a magnetic tape, which is read by a tape reader attached to the CNC machine. This method was commonly used in the early days of CNC machining, but has largely been replaced by newer, more efficient methods.

• The choice of method depends on factors such as the complexity and length of the program, the available technology, and the operator's preferences. In general:

  • Local Memory/Access methods are more suitable for smaller or simpler programs, especially ones that are ran on specific machines repeatedly without change

  • Remote Memory/Access methods are preferred for larger or more complex programs, and ones that vary and are updated/changed regularly

  • Obsolete Memory/Access methods are now less commonly used due to advances in technology and the availability of more efficient and reliable methods, but may still be used for older machines in some production environments

• Both graphics runs and dry runs are important because they help to reduce the risk of errors and ensure that the G-code program will run correctly on the CNC machine. By using these testing methods, operators can catch potential problems before they occur, reducing the risk of damage to the machine or the part being machined. This can save time and money, as errors can be corrected before any actual cutting takes place. Additionally, these testing methods can help to increase efficiency and reduce downtime, as operators can quickly identify and address any issues before running the program on the machine.

Safely Running a Program

• • For this Checkpoint, you will be running a program to make a ?????:

    • Using the instructions given in the comments of the program below, ensure your setup from the previous checkpoints is correct to run the program:

      • O????? (?????).nc

    • Before cutting your parts, do both of the following:

      • Perform a Graphics Run, to check for code alarms/errors

      • Perform a Dry Run, to check for setup errors

      • Have your instructor verify proper setup

    • Run the program to cut out the ?????, & inspect according to the blueprint shown below

  • Once done, add documentation of your progress to your previously-created "CNC Lathe Operation" Project page on your portfolio website, including:

    • Pictures(s)/Gif(s)/Video(s) and/or Summaries/Descriptions of:

      • Your full setup before running OP1 of the program

      • The part after OP1

      • Possible improvements

      • Descriptions/summaries of what you did/learned, including any mistakes/learning moments during this task