The process of programming machining center tapping requires the following steps:

1. Understand the need for tapping: Determine the location, hole diameter, and thread specifications that require tapping.

2. Write the G code for tapping: Use appropriate G code instructions to control the machining center to perform tapping operations. The following are commonly used instructions for tapping:

- G00: Rapid positioning to the tapping starting point.

- G01: Linear interpolation moves to the tapping end point and starts cutting feed at the same time.

- G02/G03: Circular interpolation command, used for the circular portion of thread tapping.

- G76: Tapping cycle command, used to control tapping parameters, such as tapping direction, feed speed, dwell time, etc.

3. Specify tapping parameters: According to the thread specifications, specify the tapping feed speed, speed, tool selection and other parameters.

4. Programming a repeated tapping cycle: If you need to tap multiple holes continuously, you can use cycle instructions to simplify programming.

Here is a sample tutorial, taking tapping thread as an example:

1. Determine tapping requirements: Assume that you need to tap an M6 internal thread on a hole with a diameter of 10 mm.

2. Write tapping G code:

```

G00 X0 Y0 ; Rapid positioning to the tapping starting point

G01 X10; Linear interpolation moves to the tapping end point and starts cutting feed

G76 P030060 ; Tapping cycle, set the tapping parameters, P parameter is the tapping direction, R parameter is the feed speed

```

3. Specify the tapping parameters: According to the M6 thread specification, assuming the feed rate is 0.1mm/rev, the tapping direction is right-hand tapping.

4. Repeat the tapping cycle as needed: If you need to tap multiple holes, you can use the cycle command in the program.

It should be noted that when writing a tapping program, you must first confirm that the machining center has the tapping function, and refer to the corresponding programming manual and guide for operation according to the specific equipment and software. In addition, it is recommended to verify the accuracy and safety of the program in a simulation or test environment before actual operation.