Cross & Draw Filing

Summary

In this tutorial, the presenter explains the difference between two filing techniques: cross-filing and draw filing. The video demonstrates the use of files, primarily for shaping metals and plastics, focusing on rectangular files with both rough and smooth textures. Cross-filing is used to remove a larger amount of material, while draw filing is a more delicate technique for fine finishing. The presenter emphasizes the importance of posture, hand positioning, and proper technique for both methods, ensuring efficient and accurate filing. Tips for achieving smooth finishes are also shared, making this an insightful guide for beginners.

Takeaways

• 😀 Files are used to remove material from plastics, metals, and sometimes wood.
• 😀 Two main types of files: rough files for large material removal and smooth files for finishing work.
• 😀 The file handle has a tang that fits into it, providing a secure grip for use.
• 😀 Files have a safe edge that is smooth and used when filing into 90-degree corners.
• 😀 Cross-filing is a technique for removing a large amount of material quickly.
• 😀 Proper workholding and positioning of the workpiece are essential to avoid noise and cracking.
• 😀 The boxer stance is recommended for cross-filing: left hand on the handle, right hand on top of the file for better control.
• 😀 Always keep the file level to avoid a curved edge when cross-filing.
• 😀 Cross-filing leaves a rough finish, which is not ideal for finishing work but good for large material removal.
• 😀 Draw-filing is used for finer material removal or finishing work, with a smoother result than cross-filing.
• 😀 In draw-filing, grip the file closer to the end and move it smoothly across the workpiece for a delicate finish.

Q & A

What is the primary purpose of a file?

A file is a tool used to remove material from a piece of plastic, metal, or occasionally wood. It is primarily used for shaping and smoothing these materials.

What are the main differences between rough and smooth files?

A rough file has a coarser texture for removing larger amounts of material, while a smooth file has finer teeth, making it ideal for finishing and removing small amounts of material.

What is the 'tang' in a file?

The tang is the part of the file that fits into the handle. It is compressed into the handle to secure the file for use.

Why does a file have one safe edge?

The safe edge of a file is smooth and is used when filing into a 90-degree angle corner, ensuring that the file does not damage or catch on the surrounding material.

What is the purpose of cross-filing?

Cross-filing is used to remove a significant amount of material quickly. It involves moving the file back and forth across the piece, applying pressure with the hand on the top of the file.

Why is it important to place the workpiece low in the vice while cross-filing?

Placing the workpiece low in the vice minimizes noise and reduces the risk of cracking, which can occur when the workpiece is positioned too high.

How does a 'boxer stance' contribute to effective filing?

The boxer stance, where the file handle is held with one hand and the other hand is on top of the file, helps apply downward pressure, which accelerates material removal. It also ensures better control and stability.

What should be avoided while cross-filing to prevent undesirable results?

One should avoid rocking the file back and forth, as this can lead to a curved edge on the workpiece, which is not desirable.

What is draw filing, and how is it different from cross-filing?

Draw filing is a more delicate technique used for finishing. Instead of moving the file back and forth as in cross-filing, the file is drawn across the piece in a straight motion, resulting in a smoother finish.

What is an additional method for achieving a smooth finish on the workpiece?

An additional method for achieving a smooth finish is by wrapping emery paper around the file, wetting it, and then using it to finish the workpiece, which results in a polished surface.