How do you bend stainless steel tubing without kinking?

Bending stainless steel tubing without kinking requires careful technique and the right tools. Here are some methods and tips to help you achieve a smooth bend:

1. Use a tube bender:
   - A dedicated tube bender is the best tool for the job, as it's designed to support the tube during bending.
   - Choose a bender appropriate for your tube's diameter and wall thickness.

2. Fill the tube:
   - Filling the tube with sand, salt, or a specialized bending spring can help prevent collapse and kinking.
   - Seal both ends of the tube before bending.

3. Mandrel bending:
   - A mandrel is a flexible rod inserted into the tube to support its inner wall during bending.
   - This method is especially useful for tight radius bends.

4. Proper lubrication:
   - Use appropriate lubricant on the tube and bending die to reduce friction and stress on the material.

5. Slow and steady:
   - Bend the tube gradually, applying even pressure throughout the process.

6. Maintain proper tension:
   - Keep the tube under slight tension as you bend to help prevent wrinkles on the inside of the curve.

7. Choose the right bend radius:
   - The bend radius should generally be at least 3 times the tube's outer diameter to minimize the risk of kinking.

8. Annealing:
   - For very tight bends, annealing the tube before bending can make it more pliable.

9. Use a rotary draw bender:
   - This type of bender provides excellent support and control, reducing the likelihood of kinking.

10. Practice:
    - Start with less critical pieces to perfect your technique before working on important projects.

Remember, the specific method may vary depending on the tube's diameter, wall thickness, and the desired bend radius. Always follow safety precautions and wear appropriate protective gear when working with metal tubing.