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Plasma / Waterjet DFM

Contents

• Prerequisites
• Introduction
• Hole Sizes Relative to Part Thickness
• Fillets
• Number of Features and Cut Time

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Prerequisites

To understand the content on this page, you should know how to

• Understanding of what a plasma and waterjet are.

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Introduction

This wiki page provides guidelines for designing parts to be manufactured on a plasma table or waterjet. Following these guidelines will help ensure optimal cutting performance and part quality.

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Hole Sizes Relative to Part Thickness

When designing holes in parts, it is important to consider the relationship between the hole size and the part thickness. The following guidelines should be followed:

• Minimum Hole Diameter: The minimum hole diameter should be at least equal to the thickness of the material. For example, if the material is 1/4 inch thick, the minimum hole diameter should be 1/4 inch.
• Recommended Hole Diameter: For best results, the hole diameter should be at least 1.5 times the material thickness. This helps ensure clean cuts and reduces the risk of hole deformation.

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Fillets

Adding fillets to internal and external corners can improve the cutting process and part quality. The following guidelines should be considered:

• Internal Corners: Use a minimum fillet radius of 1.5 times the material thickness. This helps reduce stress concentrations and improves cut quality.
• External Corners: Use a minimum fillet radius of 1.0 times the material thickness. This helps prevent sharp corners from becoming weak points.

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Number of Features and Cut Time

The number of features in a design can significantly impact the cut time. The following considerations should be made:

• Feature Complexity: Simplify the design by reducing the number of intricate features. Complex designs with many small features can increase cut time and reduce overall efficiency.
• Feature Spacing: Ensure adequate spacing between features to prevent heat buildup and material warping. A minimum spacing of 2 times the material thickness is recommended.
• Cut Path Optimization: Optimize the cut path to minimize travel distance and reduce cut time. Group similar features together and plan the cut sequence to minimize unnecessary movements.