The number of passes is controlled by the Number of Steps parameter on the Strategy tab. You can specify either Fixed or Calculate.
If you select Fixed, then you must enter the total steps required for the threading operation in the Passes field. In this case, the passes are of a fixed depth.
If you select Calculate, then the number of steps for the threading operation is calculated by the system. Additionally, if you select Calculate, then you must supply data for the Step 1, Step 2 and Minimum Infeed fields. In this case, the first step is cut at a depth of Step1. The second and successive cuts are at a depth of Step 2. When the remaining depth is less than Minimum Infeed, it is cut with a single pass.
The other details of this operation are controlled by the manufacturing attributes contained on the Turning tab.
To display this tab:
Click on the Thread operation in the tree view
Click on the Turning tab.
This figure illustrates the attributes the control treading.
Thread manufacturing parameters
How to set manufacturing attributes