Strategy tab (Thread feature)

Below centerline — Enable this option to make the tool work on the negative X side of the spindle centerline.

Turn to diameter — Optionally create a rough and/or finish pass to turn the part down to the diameter of the thread. The creation of these operations is controlled by the Turn to diameter: Rough and Finish options on the Strategy page. See How a turn feature is manufactured for more details.

Chamfer — Enable the Chamfer option to add a chamfer to your Thread feature.

The chamfer slopes into the thread for OD threads (turn) and away from the thread for ID threads (bore).

Note: You must select either Rough or Finish to access the Chamfer option.

Relief Groove

Thread — Enable this option to have a thread operation on the feature.

Feed direction — This is the direction of the feed moves, select from:

• Toward spindle — the threading is performed in the direction toward the spindle.
• Toward face — the threading is performed in the direction away from the part face.

Passes — This is the number of steps to the bottom of the thread. Select either Fixed or Calculated.

• Fixed — refers to a fixed rate of material removal. As the tool cuts further into the part, the area of contact of the tool increases. FeatureCAM reduces the infeed on each pass so that the tool loading remains constant. Enter the number of passes in Count.
• Calculated — the number of steps is calculated automatically by FeatureCAM.
  • Step1 is used to specify the incremental step for the first pass across the thread.
  • Step2 specifies the second pass and is used by the system to determine subsequent passes on the thread, reducing in depth until the Min Infeed value is reached.

Spring passes — A spring pass is a duplicate of the final threading pass. Enter the number of Spring passes that you want.

Do chamfer on exit — Select to enable FeatureCAM to use a Chamfer move when exiting the thread feature.