Cutting glass tubes of various diameters. Master class: how to cut a bottle with thread - nothing complicated! YouTube markings on a glass tube

Work on wood and glass Korshever Natalya Gavrilovna

When it is necessary to cut a product such as a glass tube, proceed in the following way.

At the location of the required separation, the tube is ground with a file. If the diameter of the tube is more than 1 cm, you must first make a cut over the entire surface, that is, form an even ring. On glass tubes of smaller diameter, it is enough to make a linear cut. But to obtain a smoother cut edge, it is also advisable to grind the tube around. You need to break the treated tube carefully; it is better to wear mittens on your hands.

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There are several simple ways to trim the neck glass bottle. You may ask why is this necessary? From a beautiful cut bottle you can make cool glass, a flower vase or a stand for various small items. But before you start cutting beautiful bottles However, I still recommend practicing in regular pubs, since this requires experience and some dexterity: it doesn’t always work out the first time.

So, I’ll tell you the most simple ways cut off the neck of a glass bottle.

Method 1 - use a glass cutter

Here you will need a glass cutter. You can use a factory model or make it yourself. Design homemade device may be different: the main thing is that the bottle and cutting element were securely fixed, but the bottle rotated freely.

Important! When cutting, you need to make one pass: this will ensure the most even edge.
Next, you need to prepare hot (boiling water) and cold (with ice) water. First we pour along the cutting line hot water so that the glass warms up well.

After this, immediately pour over the bottle cold water.

Due to temperature contraction, the glass should break off along the preliminary cut line. If this does not happen, the procedure must be repeated (douse it first with hot and then with cold water).

Method 2 - candle flame

This method will require a candle and a piece of ice (you can use a container of very cold water). To break off the neck, draw a straight line on the bottle with a marker, along which the glass warms up well above the candle.

The cutting line is then cooled with ice, after which the glass is cracked by lightly tapping it.

Method 3 - nargev from friction

Another way to break off a bottleneck is to use frictional heating on the glass. To do this, two plastic ties are put on the bottle, which serve as limiters. Three turns of twine are wound between them, after which the twine begins to move forward/backward by the free ends.

After 2–3 minutes, when the glass is hot enough, the bottle is placed in cold water, and when lightly tapped, chipping occurs along the heating line.

If you make a small cut on the bottle with a glass cutter before rubbing with twine, then you do not need to use cold water: the glass will crack when heated on its own.

Method 4 - installation with filament

This method will require a transformer, for example, with microwave oven with the secondary winding removed, instead of which three turns of a powerful power cable are installed.
The free ends of the wire are closed through a thick wire. The stand (base) must be heat-resistant and dielectric.

The next step is to connect the transformer to the electrical network. When you turn on the transformer, the filament will heat up: a bottle is applied to it and gradually rotates. When the glass is heated, the neck along the heating line will disconnect, so you need to make sure that the heating is uniform and along the same line.

Method 5 - burning rope

This method requires natural twine and some refined lighter gasoline. A piece of twine is cut to the length required to wrap around the bottle at least 3 times. This piece of string is then soaked in gasoline until it is completely saturated.

Twine soaked in gasoline is wound around the bottle in the place where it is necessary to chip and set it on fire.

When the gasoline has almost burned out, the bottle is lowered into cold water, where the temperature difference causes the glass to burst along the heating line.

Method 6 - use specialized equipment

This method is to use electric machine for cutting tiles. Diamond blade It cuts thick glass well and evenly. It is recommended to work with gloves, a protective mask and goggles, as glass dust is very dangerous. The advantage of using a cutter is the ability to cut the bottle into small pucks, which is not possible with other methods.

Cutting glass tubes, rods, bottles, blanks and flat glass is one of the most common operations in laboratory and glassblowing work. In most cases it precedes all glassblowing operations. Only a properly cut tube is suitable for further processing(soldering of tubes, melting of ends of tubes, soldering of extensions, etc.). The cross-section of the end of a correctly cut tube should be strictly perpendicular to its length, and not have any jagged or fibrous parts, as well as short cracks located at a slight angle to the cut site. Depending on the diameter of the tube or workpiece, various ways cutting

Rice. 27. Cutting tubes for fracture

Cutting tubes for fracture. This method is used to cut tubes with a diameter of 20-23 mm and glass rods. In this case, the glass tube is placed on the edge of the table and its protruding part is held with the left hand. In the simplest case, the tube is simply clamped in the left hand. A knife (cutter) made of hard alloy or a sharp file with a fine notch is taken in the right hand. Having placed a cutter or file on the tube in the intended place strictly perpendicular to the length, with your left hand you rotate the tube towards yourself by about a quarter of the diameter (Fig. 27, a). To reduce the surface tension at the cut site, the tube can be moistened with water or a soap solution.

The incision can be made using another method. With your right hand (the tube is clamped in your left hand), place the knife on the tube and, with a slight downward pressure, make a scratch, then push the knife back up, without removing it from the tube, and back down towards you. This creates an even cut equal to a quarter of the diameter of the tube. The cut can be made differently by placing one end of the tube on right knee and pressing the other end with your left hand to your left leg.

Glassblowers often use the following technique to apply a mark. The glass tube to be cut is grasped tightly with the left hand, holding it between the thumb and forefinger. Take a cutter or file in your right hand (Fig. 27, b). Pillow thumb The right hand should rest against the sharp edge of the file. The tube is then clamped tightly between the sharp edge of the file and thumb and make a slight turn: right hand- towards yourself, and with your left - away from you, making a slot on the surface of the tube.

Beginners learning how to cut glass should use this technique with great caution, since with strong pressure the tube, especially a thin-walled one, can break and injure your hand. After applying the mark, the tube is taken in both hands with the mark; up so that the mark is at the same distance from the right and left hands, and smoothly, stretching in different sides tube, break it (Fig. 27, c). If the tube does not break, make a second mark on the old mark using one of the indicated methods and break it again. To reduce surface tension, the slot mark is moistened with water. The tube breaks more easily. While students become proficient at cutting pipes, this operation should be done with their hands wrapped in a towel or rag to prevent cuts. When cutting, glass rods are broken with a sharp movement so that burrs do not form on the ends.

If it is necessary to cut the tube close to its end, use the following technique. A deep cut is made on the tube with a cutter, the tube is placed on the edge of the edge of a metal prism or on the edge of a triangular file with the mark facing up. It is necessary to ensure that the scratch applied to the glass falls exactly against the sharp edge of the prism. Then, with a light blow of a knife or file on the short end, it is cut.

Glass rods can be cut in the same way by placing the short end of the rod on the corner of the table.