Use Pocket and Contour Material Only in GibbsCAM 2024

Summary

GibbsCAM 2024 improves Material Only output when a Contour operation follows a Pocket operation in the same process list and both operations use Material Only. The Pocket establishes the material state, and the dependent Contour more reliably targets the intended remaining material.

Table of Contents

• What Changed in GibbsCAM 2024
• Before You Begin
• Procedure
• Related Video
• Best Practices
• Troubleshooting
• Related Articles

What Changed in GibbsCAM 2024

Important: There is no new checkbox for this improvement. Operation order, a shared process list, the starting stock, and recalculation order determine the material state used by the dependent Contour.

Before You Begin

•  Open a backup copy and preserve the original toolpaths, Simulation result, and posted output.

•  Confirm that the Pocket and Contour operations are in the same process list and use the intended starting stock.

•  Place the Pocket before the dependent Contour and enable Material Only in both operations.

•  Confirm the selected geometry, tools, process settings, operation dependencies, and machining coordinate system.

Procedure

Step 1 - Confirm the Starting Material State

1.  Open a copy of the job and select the stock condition that represents the actual start of the process list.

2.  Simulate the existing operations and inspect the material immediately before the Pocket operation.

3.  Resolve stale toolpath or unexpected stock changes before recalculating the dependent operations.

Step 2 - Order the Pocket and Contour

1.  Place the Pocket operation before the Contour operation in the same process list.

2.  Confirm that the Pocket removes the bulk material and that the Contour is intended to address the remaining walls or regions.

3.  Verify the tool, geometry, depth, containment, and coordinate system for both operations.

Step 3 - Enable Material Only

1.  Enable Material Only in the Pocket operation.

2.  Enable Material Only in the dependent Contour operation.

3.  Review any stock allowance, tolerance, offset, or remaining-material settings that affect the handoff between operations.

Step 4 - Recalculate in Dependency Order

1.  Recalculate the Pocket operation first so GibbsCAM establishes the updated material state.

2.  Recalculate the dependent Contour second.

3.  Repeat the same order whenever the Pocket geometry, tool, depth, stock allowance, or toolpath changes.

Step 5 - Verify the Result

1.  Simulate from the intended starting stock and inspect the material state between the Pocket and Contour operations.

2.  Confirm that the Contour targets the intended remaining material without unnecessary air cutting, missed stock, or overcut.

3.  Post with the approved post and complete the normal prove-out before production use.

Expected Result

•  The Pocket establishes the intended intermediate material state.

•  The following Contour targets the remaining material instead of repeating cleared regions unnecessarily.

•  Simulation shows the correct stock transition between operations without missed material or overcut.

Related Video

Best Practices

•  Keep dependent Pocket and Contour operations together and in the correct order.

•  Recalculate the Pocket before the Contour whenever an upstream setting changes.

•  Simulate from the actual starting stock rather than an unrelated or stale stock condition.

•  Compare proven and recalculated toolpaths before changing production work.

Troubleshooting

•  Problem: The Contour does not follow the Pocket material state.

Cause

•  The operations are in the wrong order or are not in the same process list.

•  Material Only is not active in both operations, or one operation contains stale toolpath.

Resolution

Place Pocket before Contour, enable Material Only in both, and recalculate them in order. Simulate from the intended starting stock and verify the material state between operations.

•  Problem: The Contour still cuts excessive air.

Cause

•  Simulation starts from an incorrect stock condition or the Pocket result is stale.

•  The Contour geometry, depth, tolerance, or remaining-material settings include regions outside the intended Pocket result.

Resolution

Confirm the starting stock, recalculate the Pocket, and inspect the intermediate material state. Then review the Contour geometry and process settings before recalculating it.

•  Problem: The dependent Contour changes after the Pocket is edited.

Cause

•  The Contour uses the material state created by the preceding Pocket.

•  A change to Pocket geometry, tool, depth, allowance, or toolpath changes the remaining material.

Resolution

Treat the change as a dependency update. Recalculate Pocket first and Contour second, compare both results with the saved baseline, and approve the complete process list again.

Related Articles

•  What's New in GibbsCAM 2024

•  VoluMill Cutting Air When Using Material Only

•  Recommended Simulation Settings

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Keywords

GibbsCAM 2024, Pocket, Contour, Material Only, remaining material, stock, operation order, recalculation, air cutting