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Chapter 1. Basic Machining and Tips

Removal of Burrs

Removing of Burrs

The burrs are rough edges which are generated as a result of the cutting process. It is often called a flash in English. There are the visible burrs as shown in Figure 1 and the invisible burrs, which are confirmed by touching the edge. In order to make an accurate part, it is very important to remove the burrs with a file. We must remove them carefully after the cutting process.

Fig. 1, Visible Burrs

Why we need to remove burrs?

(1) In most cases of the machining process, the material is set to a chuck of a lathe or a vice of a milling machine as shown in Figure 2. If the burrs are remained, the material can not be accurately set. And as a consequence, the piece will be mounted at an askew or off center as shown in Figure 3. Also, small amounts of waste can become trapped and as a result can also cause askew or off center work pieces.

Fig. 2, Setting a Material

Fig. 3, If There is a Burr...

(2) If the burrs are not removed, the size of the part can not be accurately measured. It is therefore imperative to remove the burrs before the measurements are taken.

(3) Another reason for removing burrs is that the can cause injury to personal due to sharp edges.
(4) Also if burrs are not removed, they can seriously affect the assembly process of the parts.

Fig. 4, If a Burr is Remained...

Removiing a Burr using File and a Wooden Surface

It is advisable to use a wooden work surface to aid in the removal of a burr as the timber surface provides a good support while at the same time it does not damage the file if it comes into contact with the timber. Not that the file is "Pushed" along the edge and not "Pulled".

Fig. 5, Using a board to Facilitate the Removal of a Burr

Lathe Process and Removal of a Burr

A burr can also be generated during the lathe process. It can be easy removed by applying a file to the burr on the rotating material. Be careful to not touch the rotating part with your finger.

Fig. 6, Removal of a Burr after Lathe Process

Remove a Burr after Drilling Process

A burr generated during a drilling or tapping process is removed using a bigger drill. A little burr can be easily removed by rotating the drill bit by hand. Larger burrs may need to be removed by mounting the drill bit in a drilling machine.

Fig. 7, Removing a Burr by Hand after Drilling

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