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I. How to Use

• Definition

When drawing a H-beam, the section preview is shown below:

As you can see, on one side of the web, the starting and ending points of the corner R form a θ angle of 90° with the circle center.?

• • • The length of the web toolpath varies with different θ angles.?
    • Based on experience, if θ exceeds 45°, it may cause interference during cutting.
    • The closer the web toolpath is to the flange, the easier it is to cut.
    • By default, θ is set to 45°, meaning the farthest point of the web toolpath aligns with half of the?corner?R.

The image below illustrates the difference:

• Specific Operations

θ-related parameters are not available in the Draw Part. The web toolpath endpoint of drawn or imported parts is managed in:

User Preference Settings → User Preference (scroll down to Other) → H-Beam toolpath angle.

• • • Default value: 45°. Modification is not recommended. If modified, it should not exceed 45° due to interference risks.
    • Set the θ angle before importing parts—once imported, the option is grayed out.

    • If parts have already been imported, even deleting all parts does not restore access to this setting. You must click New in the top-left corner before adjusting the setting in the User Preference Settings.

When θ exceeds the set limit, the system automatically whitens (not processed) that section of the toolpath to ensure safety. Here is a typical case.

?

II. Common Scenarios and Solutions

• Case 1

• • For toolpaths where θ < 45°, the cutting head follows the path normally.
  • For toolpaths where θ > 45°, the software disables the toolpath automatically. If you still want to process these areas, it is recommended to use Fixed height cutting.

Use the?Optimize H-Beam Web Toolpath?function to set this automatically.

Before Optimization:

After Optimization:

Before Optimization:

?

After Optimization:

?

• Case 2

If the R size of the I-beam does not match the drawing exactly, and you want to shorten the web toolpath at corner R to avoid collisions during cutting, you can reduce the θ angle slightly.

• • • Modifying this value is generally not recommended unless necessary.

    • After making changes, reset the value to default before reopening the software to prevent unintended toolpath issues in future operations.

    • This setting applies to all parts, so ensure that all parts in a batch are compatible with the adjustment.

The values in the image are for reference only; adjust based on actual conditions.