Repair of the plastic handle of scissors. How to sharpen scissors and adjust their blades with your own hands at home

This one of the most common tools that every family has for cutting all kinds of materials does not always perform its tasks clearly enough.

The reason for rough work is improper sharpening of blades or imbalance in the movement of cutting edges.

Eliminating them is quite simple for anyone, having the usual set of sharpening devices. To do this, it is necessary to present the principles of creating a cut.

Article provides tips home master how to sharpen scissors and adjust their blades for correct operation do-it-yourself at home with an explanation in the course of the presentation of the text with pictures, diagrams and a video.

To understand the principles of sharpening and setting the tool, one should represent its design, the basics of cutting the processed materials.

How scissors are arranged and work

The well-known children's riddle about two ends, rings and studs fully reflects the design and principle of operation of this tool.

Scissors consist of two symmetrical halves connected by a common axis of rotation. The cutting force is created due to the occurrence of a torque, the value of which is affected by the length of the lever.

Knife blades have working surfaces ending in a cutting edge. The ends can be of various shapes:

1. sharp;
2. rounded;
3. combined.

The axis of rotation is usually performed by a screw mechanism with the possibility of a slight adjustment of the preload.

Blade geometry

Hairdressing scissors have the best surface shapes. They are designed for fine hair cutting work, made of durable steels with well-sharpened cutting edges moving in the opposite direction.

The cutting edge of each half slides with one side along the common plane of the cut towards the material being processed. The cut is created due to the sharpness of the supply of the blades and their minimal approach to each other.

Blade sharpening, unlike a conventional knife, is created by a one-sided supply.

cutting force

It should be borne in mind that each tool is made to work in certain conditions. For example, hairdressing scissors are made even. The loads they experience are minimal. It is undesirable to use them for other purposes: it is easy to damage.

Garden shears can cut tree branches, and the surface of their blade is formed with three zones of developed loads:

• the recess closest to the axis of rotation allows you to generate the maximum cutting force;
• the next one is the average;
• the rest is for cutting thin branches.

In this case, the effect of creating a bending moment through the lever is used: the approach of the processed material to the axis of rotation increases the shear force, and the removal decreases it.

Typical defects

Any scissors can work poorly for two reasons:

1. blades parted;
2. the cutting edge of the lead has blunted.

How does the gap arise?

If the scissors are made of soft alloy steel, then when creating large loads on the blade, the latter can be deformed, move away from the cut plane. In this case, they will additionally bend the material, and not cut it.

Such a defect is easy to detect if you look at the gap between the shifted blades.

How to adjust blade travel

The cause of the divergence of the surface of the edges can be:

1. loosening of the screw clamp of the axis of rotation;
2. deformation of the metal due to the application of increased loads;
3. combined manifestation of both faults.

In the first case, it is enough just to tighten the screw: the scissors will cut normally. If there is a bend in the plane of a thinner blade (they are most often created of different thicknesses), then it should be given its original shape.

It is unlikely that it will be possible to bring hairdressing scissors in this way to an ideal level. However, household models designed for cutting paper or fabric can be adjusted by making a convex bend in the surface so that when processing the material, both blades come into contact while being in a common cutting plane.

Cutting edge violations

The metal of the blade of a scissor blade, like that of a knife, wears out over time.

Periodically, its sharpening is required, the formation of the surface of the cutting wedge of the supply. Depending on the purpose of the tool, the edge is formed:

• ordinary sharpening;
• or additional polishing of its surface.

Hairdressing scissors do not polish the edges during sharpening. Thin grooves from fine-grained abrasive materials, located on the supplies, hold the hair well when cutting.

Sharpening methods

A professional approach angle is formed on special machines in the factory. It must be preserved and supported. The article does not consider factory technology, but publishes simplified methods available to the home master to bring household models into working condition.

Scissor dressing tools

Sharpener

The blades of the scissors are bred and alternately dragged through the slot prepared in the tool. The supply metal is ground with abrasive materials. Rotating discs can be used for this. All notches and irregularities are removed to a single level.

Various types of sharpeners can be purchased through Chinese online stores.

Diamond file or file

When sharpening, scissors should be well fixed or held tightly in your hand, resting it on some stationary object, for example, a table surface.

The cutting surface of the file must be located in only one plane. This technique provides the same sharpening angle along the entire length of the blade. Its factory value must not be violated.

If there is a large notch on the surface of the file, then additional polishing of the approach with another tool may be required.

Bar, whetstone, whetstone

It is desirable to disassemble scissors, but it is possible to work in assembled form. The technology is the same as . The supply is placed on the surface of the grindstone, the blade is led in one direction, all the time they maintain strictly one angle of inclination. The abrasive material is periodically moistened with water, removing particles of cut metal.

The photo shows work on a homemade grindstone,

If the shape of the blade differs from a straight line, having a convexity or concavity, then the direction of sharpening movement is changed by 90 degrees.

improvised means

Consider the most affordable sharpening tool:

• sandpaper;
• foil;
• steel washcloth;
• the neck of a glass bottle;
• steel wire.

Sandpaper

Choose varieties with the smallest grains - zero. Cut it along the entire length of the blade. The abrasive material of the sandpaper, passing under the cutting edges, sharpens them.

Foil food or technical thin

The material is folded in several layers, cuts are made along the entire length of the blade.

Foil kitchen scourer

This method works on the technology of the previous one. Scissors should work along the entire length of the blade.

Glass bottle

Grasping the neck with both blades, they make cutting movements along their entire length in both directions. Surfaces are being polished. Therefore, the plane of the inlets is placed in the optimal direction for their alignment.

Needle, screwdriver or steel wire

Squeezing and unclenching the scissors, they are simultaneously treated with force along the entire length of the blades with an inserted needle.

A characteristic feature of this tool is the curved blades of a curvilinear shape. It is better not to start processing them without good locksmith skills and round fine-grained diamond-coated files.

If nail scissors began to work poorly, then first try:

• tighten the screw fastening of the axis of rotation;
• inspect the gap between the cutting edges of the leads;
• polish with a needle.

If you have any questions, then ask them in the comments.

The most effective repair of plastic on the example of hand scissors, in which one of the handles broke from excessive force. I will talk about a way to restore broken plastic products. This method will allow you to use them as intensively as before the breakdown.

What do we need

• Cyanoacrylate glue (regular superglue, and gel is best - it does not spread);
• Paper tape;
• soldering iron;
• A piece of stranded wire.

Preliminary bonding repair
First you need to restore the geometry of the broken handle. To do this, we glue it with superglue, observing the rules for performing work - the substance is applied to both surfaces, and after the reaction with the plastic begins, they must be pressed tightly against each other until completely hardened.


In order not to sit for several hours with scissors in our hands, we use paper tape to fix the broken handle.


Connection reinforcement
After the glue dries, the scissors can be used, but if you cut something with force, they will most likely break again in the same place. To avoid this, it is necessary to perform reinforcement. To do this, we need to remove the insulation from the copper wire with a cross section of 2.5 mm and cut off 1 cm from the edge. Then it must be placed on paper tape, gluing only half, and then applied in the center of the glued joint and glued to the scissors with the same tape. Thus, on one side of the break, the wiring harness will not be closed by anything.




Next, with the help of a heated soldering iron, we begin to warm up the wires of the free edge, which, in turn, melt the handle and slowly sink into it. We smooth out the plastic that appears on top of the wires with a soldering iron, aligning the traces of our intervention.


After we repeat the procedure with the other edge of the tourniquet, after removing the adhesive tape. The wires must be completely immersed in plastic, no protruding cores should be left. At the end of the work, we level the entire surface of the area on which the reinforcement was carried out.




Reinforced connection on both sides.


Safety
When working with a soldering iron, precautions should be taken - the part above the handle is very hot, and the tip has a melting point of tin and can cause severe burns on contact with the skin.
Trial


After the plastic has completely cooled, the scissors are ready for use. To check the strength of the connection, take a stick for sushi - it is made of wood and strong enough. To cut it, you have to make a lot of effort, but the restored connection in this experiment proved to be excellent, withstanding a fairly serious load.
Restoring plastic using reinforcement is a completely simple procedure, but very effective. In any case, you won't have to throw away the scissors now.


Watch the video

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The most effective repair of plastic on the example of hand scissors, in which one of the handles broke from excessive force. I will talk about a way to restore broken plastic products. This method will allow you to use them as intensively as before the breakdown.

What do we need

• Cyanoacrylate glue (regular superglue, and gel is best - it does not spread);
• Paper tape;
• soldering iron;
• A piece of stranded wire.

Preliminary bonding repair

First you need to restore the geometry of the broken handle. To do this, we glue it with superglue, observing the rules for performing work - the substance is applied to both surfaces, and after the reaction with the plastic begins, they must be pressed tightly against each other until completely hardened.

In order not to sit for several hours with scissors in our hands, we use paper tape to fix the broken handle.

Connection reinforcement

After the glue dries, the scissors can be used, but if you cut something with force, they will most likely break again in the same place. To avoid this, it is necessary to perform reinforcement. To do this, we need to remove the insulation from the copper wire with a cross section of 2.5 mm and cut off 1 cm from the edge. Then it must be placed on paper tape, gluing only half, and then applied in the center of the glued joint and glued to the scissors with the same tape. Thus, on one side of the break, the wiring harness will not be closed by anything.

Next, with the help of a heated soldering iron, we begin to warm up the wires of the free edge, which, in turn, melt the handle and slowly sink into it. We smooth out the plastic that appears on top of the wires with a soldering iron, aligning the traces of our intervention.

After we repeat the procedure with the other edge of the tourniquet, after removing the adhesive tape. The wires must be completely immersed in plastic, no protruding cores should be left. At the end of the work, we level the entire surface of the area on which the reinforcement was carried out.

Reinforced connection on both sides.

Safety

When working with a soldering iron, precautions should be taken - the part above the handle is very hot, and the tip has a melting point of tin and can cause severe burns on contact with the skin.

Trial

After the plastic has completely cooled, the scissors are ready for use. To check the strength of the connection, take a stick for sushi - it is made of wood and strong enough. To cut it, you have to make a lot of effort, but the restored connection in this experiment proved to be excellent, withstanding a fairly serious load.
Restoring plastic using reinforcement is a completely simple procedure, but very effective. In any case, you won't have to throw away the scissors now.

What parameters of scissors should be monitored so that they work efficiently and for a long time? Mainly for two:

• blade sharpness, sharpening safety;
• correct adjustment of the convergence of the canvases.

With the sharpness of the blades, everything seems to be clear - if they become dull, then the scissors begin not so much to cut the hair as to cut it. They crumple, wring, sometimes they even begin to pull out - you can’t work with such scissors.

And in principle, this is understandable to any person, even completely far from hairdressing.

But the second point - the correct convergence of the canvases - is a less well-known thing, but no less important. It happens that the master realizes its significance just when he ruins his first scissors because of her.

No, you don't need this. Let's figure out now how to understand that it's time to regulate the convergence of the canvases.

Why do scissors need to be adjusted?

There are two blades of scissors. They are connected by a screw or a screw group - it presses the canvases against each other with a certain force. Due to this force, the scissors cut perfectly - but due to it, friction occurs. It is to protect against excessive friction that scissors should.

What happens if a screw is twisted?

However, if the screw presses the blades too hard - no amount of lubrication will help, the friction will become too high and brutal accelerated wear of the working surfaces will begin.

An additional "bonus with a minus sign" from such wrong setting scissors - that excessive friction will affect your working hand. She will get tired (of course, because you have to put more strength into each movement), plus you can zoom in and strengthen occupational diseases brushes.

What happens if a screw is not screwed in?

An interesting thing is that wear accelerates even with such a tuning error. First of all, the screw group usually fails - from too free hanging, it becomes unusable very quickly. However, canvases also get it - instead of even pressure, which they basically cope with, one canvas performs peculiar micro-impacts on another.

And another problem associated with insufficient tension of the canvases is the failing quality of the haircut. Instead of an even cut, scissors continually strive to break the hair.

How to understand that it is time to adjust the scissors?

I hope you are imbued with the seriousness of this moment and intend to prevent such an inglorious death of your main working tool. Now the question before you is: how to understand that the scissors require tension adjustment?

• Take your scissors in one hand for one ring.
• Lift them up vertically.
• Grasp the second ring with your other hand - and lift it almost to a right angle.
• Release the second ring gently.
• The scissors will begin to close under the weight of the ring - you should be interested in the point at which they stop.

Properly adjusted scissors should close about halfway - that is, the top point where the blades are connected should be approximately halfway along the length of the blades.

• If it is slightly lower or slightly higher, everything is in order.
• If it is much lower, it means that the tension of the scissors is set too high, the screw group must be loosened.
• If it is much higher, it means that the scissors are loose, the screw group must be tightened.

How to adjust scissors?

If you understand that it is time to adjust the scissors - adjust. How to do it? Depends on the scissors.

In the simplest models (I don’t know why you need them, but it happens), where the canvases are fastened not with a screw group, but with an ordinary screw, you can adjust them with an ordinary screwdriver. In principle, this usually applies not even to hairdressing scissors, but to stationery and other "Muggle" scissors - because a simple screw is so imperfect that it is almost completely abandoned in hairdressing scissors.

In scissors with an advanced screw group - that is, for example, in Mustang Professional scissors - a special key of a suitable shape is used to adjust the scissors.

There are different approaches to this key - many manufacturers, for example, prefer to sell this key for separate money. Well, we do not understand them ... How can you not respect your customers so much? In general, an adjustment key is supplied with all our scissors.

After the first changes in tension are made, repeat the test. Is everything the way it should be? If not, adjust again. Everything is clear, in principle.

Why are numbered tension screws needed?

Throughout you can see the original chip - a numbered tension screw. Hairdressers have repeatedly sent us special thanks for it - after all, it allows you to constantly control the tension of the scissors, while doing a special test not every day, like other hairdressers, but very rarely.

In addition, it allows you to see how well you tightened the scissors - just remember which number you usually stop at.

Moreover - extremely simplifies the adjustment of scissors to the hair of a particular client. Many, you know, prefer to approach hard and fine hair with different tension of scissors.

In general - a sensible thing. Give it a try if you haven't worked with them yet.