The recommended way to clean cut threads is by using a thread chaser.
A thread chaser is a tool designed to clean and repair damaged or dirty threads without cutting new ones, preserving the original thread dimensions. While it resembles a tap, it differs significantly in its function and design. Taps cut new threads, while thread chasers clean and restore existing ones.
Thread Chasers vs. Taps
Here's a table summarizing the key differences:
| Feature | Thread Chaser | Tap |
|---|---|---|
| Function | Cleans and repairs existing threads | Cuts new threads |
| Thread Cutting | Does not cut new threads | Cuts new threads |
| Relief Cuts | Has relief cuts to allow debris to escape | Typically doesn't have deep relief cuts |
| Purpose | Restore damaged threads, remove debris, realign threads | Create threads in a pilot hole |
Steps to Clean Cut Threads Using a Thread Chaser:
- Identify the Thread Size: Determine the correct thread size you are working with. This information is crucial for selecting the appropriate thread chaser.
- Select the Right Thread Chaser: Choose a thread chaser that matches the thread size and type (e.g., metric, SAE).
- Apply Lubricant: Apply a cutting fluid or lubricant to the threads. This helps to reduce friction and ease the cleaning process.
- Align the Thread Chaser: Carefully align the thread chaser with the existing threads. Ensure that it is straight and properly engaged.
- Turn the Thread Chaser: Gently turn the thread chaser into the threads, using a tap handle or wrench. Turn it slowly and steadily, applying consistent pressure.
- Back Out and Clean: After a few turns, back out the thread chaser to remove any debris. Clean the chaser and the threads.
- Repeat: Repeat steps 5 and 6 until the threads are clean and the chaser moves smoothly through the threads.
- Inspect the Threads: Once you've finished, inspect the threads to ensure they are clean and properly aligned.
Using a thread chaser is preferred over a tap for cleaning threads because it is less likely to damage the existing threads. A tap, designed to cut new threads, can remove material unnecessarily if the existing threads are still viable. The relief cuts on a thread chaser allow for removal of debris without altering the original thread form.
