The most effective repair of plastic is based on the example of hand scissors, in which one of the handles broke due to excessive force. I will tell you about a method for restoring 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 best of all gel - it does not spread);
- Paper tape;
- Soldering iron;
- A piece of stranded wire.
Preliminary restoration by gluing
First you need to restore the geometry of the broken handle. To do this, glue it together with superglue, following the rules for performing the work - the substance is applied to both surfaces, and after the start of the reaction with the plastic, they must be pressed tightly together until completely hardened.
In order not to sit for several hours with scissors in your hands, we use paper tape to fix the broken handle.
Connection reinforcement
Once the glue has dried, 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 copper wire cross-section 2.5 mm and cut 1 cm from the edge. Then it must be placed on paper tape, gluing only half, and then place it in the center of the glued joint and glue it to the scissors with the same tape. Thus, on one side of the fault, the wiring harness will not be covered by anything.
Next, using 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, leveling the traces of our intervention.
Then we repeat the procedure with the other edge of the tourniquet, after removing the tape. The wires should be completely immersed in the plastic; no protruding wires should be left. At the end of the work, we level the entire surface of the area where the reinforcement was carried out.
Reinforced connection on both sides.
Safety precautions
When working with a soldering iron, you should take precautions - the part above the handle is very hot, and the tip has the melting point of tin and can cause severe burns if it comes into 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 sushi stick - it is made of wood and quite strong. To cut it, you have to put in a lot of effort, but the restored connection showed excellent results in this experiment, withstanding a fairly serious load.
Restoring plastic using reinforcement is a completely simple procedure, but very effective. In any case, now you definitely won’t have to throw away the scissors.
What parameters of scissors need to be monitored so that they work efficiently and for a long time? Mainly for two:
- sharpness of blades, safety of sharpening;
- correct adjustment of the toe of the blades.
Everything seems to be clear with the sharpness of the blades - if they become dull, then the scissors begin not so much to cut the hair as to chop it. They crumple, they wring, sometimes they even start tearing them out - you can’t work with such scissors.
And in principle, this is understandable to any person, even those 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 a master realizes its significance just when he ruins his first scissors because of it.
No, you don't need that. Let's figure out now how to understand that it's time to adjust 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 blades to each other with a certain force. Due to this force, scissors cut perfectly - but due to it, friction arises. It is to protect against excessive friction that scissors should be used.
What happens if the screw is twisted?
However, if the screw presses the blades too hard, no lubricant will help, the friction will become too high and severe accelerated wear of the working surfaces will begin.
An additional “minus bonus” from such incorrect settings of the scissors is that excessive friction will also affect your working hand. She will get tired (of course, because you have to put more force into every movement), plus you can bring it closer and strengthen occupational diseases brushes
What happens if the screw is not tightened enough?
An interesting thing is that wear accelerates even with such a setting error. The first thing that usually fails is the screw group - it becomes unusable very quickly if it dangles too freely. However, the canvases also suffer - instead of even pressure, which they can basically handle, one canvas performs peculiar micro-impacts on the other.
And another problem associated with insufficient tension of the blades is the poor quality of the haircut. Instead of making an even cut, the scissors constantly try to break the hair.
How do you know when it’s time to adjust your 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 do you understand that the scissors require tension adjustment?
- Hold your scissors in one hand by one ring.
- Lift them with their tips vertically upward.
- Grab the second ring with your other hand and lift it almost to a right angle.
- Gently release the second ring.
- The scissors will begin to close under the weight of the ring - you should be interested in the point at which they stop.
Correctly adjusted scissors should close approximately halfway - that is, the top point where the blades are connected should be approximately halfway along the length of the blades.
- If it is a little lower or a little higher, everything is fine.
- If it is significantly lower, it means that the tension of the scissors is set too high and the screw group needs to be loosened.
- If it is much higher, it means that the scissors are loose and the screw group needs to be tightened.
How to adjust the scissors?
If you understand that it’s time to adjust the scissors, adjust them. How to do this? Depends on the scissors.
In the most simple models(I don’t know why you need them, but it happens), where the blades are fastened not with a screw group, but with an ordinary screw, you can adjust them using 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 has almost completely been abandoned in hairdressing scissors.
In scissors with an advanced screw group - that is, for example, in the 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 don’t understand them... How can you disrespect your clients so much? In general, all our scissors come with an adjustment key included.
After the first changes in tension are made, repeat the test. Is everything as it should be? If not, adjust again. Everything is clear, in principle.
Why are numbered tension screws needed?
Throughout, you can see the original feature - 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 performing a special test not every day, like other hairdressers, but very rarely.
In addition, it allows you to see how well you have tightened the scissors - just remember what number you usually stop at.
Moreover, it greatly simplifies the adjustment of the scissors to the hair of a particular client. Many people, you know, prefer to approach coarse and thin hair with different scissor tensions.
In general, it’s a smart thing. Try it if you have never worked with these before.
http://s30893898787.mirtesen.ru/blog/43737382522/C...i-nozhnitsyi-stali-ploho-rezat
Your scissors do not cut well: they “chew” the material between the blades, and when the blades are completely closed, they make only a small incision. There are calluses on my fingers, and I’m gloomy in my soul... Don’t rush to run to the store for new scissors. Let's tell you a little secret.
First of all, look to see if there is any lateral play on the axle. Simply put, are the two halves of the scissors dangling on the axle? To do this, take the scissors by the rings and use your hands to make rotational movements, as if you were tightening and unscrewing a screw. If there is any play, you will feel it immediately. As a result of this defect, the material is not clamped by the blades and “slips.” How to fix it?
The halves of the scissors are pressed against each other on the axis. If the axis is a screw, then simply tighten it tightly. If it is a bolt with a nut, tighten it while holding the nut with pliers. But if there is a rivet there, then you will have to tinker. Place the scissors on a sturdy metal surface(for example - on metal part hammer) so that the rivet head is at the bottom, on the metal. Take a pointed carbide metal object. Let it be a nail that is driven into a stone wall or, in the absence of one, an ordinary thick nail (slate, for example). Place it vertically upward in the middle of the rivet and with several short blows on the nail, knock out a hole in it up to 1-2 mm deep. Then tilt the nail 20 - 30 degrees and tap with short strokes from the hole to the periphery, gradually describing a full circle. And so on until the backlash is eliminated.
Little advice:
before eliminating the play, drop a drop of spindle (oil that is used in sewing machines).
Attention! During all of the listed procedures for eliminating play, the scissors must be opened. The fact is that the design of the scissors has one feature - the blades of the scissors are not perfectly straight, but are somewhat curved towards each other. This was done for the purpose that when they start cutting, the material pushes the blades apart, and if they were straight, then the closer to the tips, the larger the gap would become. Take the scissors, open them slightly and look at them from the narrow side. If the ends of the halves do not cross and you are unable to bend them neatly, it is better to buy new scissors.
Have you eliminated the backlash? Try scissors. As a rule, this procedure is sufficient. If the blades “tear” the fabric or, when you apply force, the fabric gets jammed between the blades, you will have to start sharpening. 
Take a whetstone you use to sharpen knives, or a finely cut file. Open the scissors. Grab the top half of the scissors by the ring with your left hand. Take a close look at the cutting edge. It is a cut at an angle of approximately 60 - 80 degrees, facing outwards. Accordingly, you place the block against the cutting edge at an angle of 60 degrees to the blade. Using movements downwards and towards you, from the tip to the axis, sharpen. Please note - the width of the strip of freshly sharpened metal along the blade should not be more than a millimeter! If the strip is wider, it means you are placing the block at an angle of less than 60 degrees, and the scissors will quickly become dull.
That's probably all. You should not “straighten” the blades or grind them after sharpening: small serrations on the cutting edge cause useful function- do not allow the material to slide between the blades.
This is one of the most common tools, which is available in every family for cutting all kinds of materials, but does not always perform its tasks clearly enough.
Rough operation is caused by improper sharpening of the blades or unbalanced movement of the cutting edges.
Eliminating them is quite simple for anyone, having a regular set sharpening devices. To do this, it is necessary to understand the principles of creating a cut.
Article provides advice home handyman on how to sharpen scissors and adjust their blades for proper operation with your own hands at home with an explanation along the text with pictures, diagrams and a video.
To understand the principles of sharpening and setting up a tool, you should understand its design and the basics of cutting the materials being processed.
How scissors are designed and work
The well-known children's riddle about two ends, rings and nails fully reflects the design and operating principle of this instrument.
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 magnitude of which is influenced by the length of the lever.
Knife blades have working surfaces ending in a cutting edge. The ends can be of different shapes:
- sharp;
- rounded;
- combined.
The axis of rotation is usually performed by a screw mechanism with the possibility of slight adjustment of the preload.
Blade geometry
Hairdressing scissors have the best surface shapes. They are designed for the delicate work of cutting hair, made of durable steel with well-sharpened counter-moving cutting edges.
The cutting edge of each half slides with one side along the common cutting plane towards the material being processed. The cut is created due to the sharpness of the blades and their minimal approach to each other.
The sharpening of the blade, unlike a regular knife, is created by a one-sided approach.
Cutting force
Please note that each tool is manufactured to work under certain conditions. For example, hairdressing scissors are made straight. The loads they experience are minimal. It is not advisable to use them for other purposes: they are 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 maximum cutting force;
- the next one is the average;
- the remaining part is intended for cutting thin branches.
In this case, the effect of creating a bending moment through the lever is used: bringing the material being processed closer to the axis of rotation increases the shear force, and moving it away reduces it.
Typical defects
Any scissors can work poorly for two reasons:
- the blades came apart;
- the cutting edge of the supply has become dull.
How does a gap occur?
If the scissors are made of soft alloy steel, then when large loads are placed on the blade, the latter may become deformed and move away from the cutting plane. In this case, they will further bend the material rather than cut it.
Such a defect is easy to detect if you look at the gap between the shifted blades.
How to adjust blade stroke
The reason for the divergence of the surface of the edges may be:
- weakening screw clamp axes of rotation;
- metal deformation due to the application of increased loads;
- a combined manifestation of both faults.
In the first case, just 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 to an ideal level in this way. However, household models designed for cutting paper or fabric can be adjusted by making a convex bend on the surface so that when processing the material, both blades touch, being in a common cutting plane.
Cutting edge irregularities
The metal of the scissor blade, like a knife, wears out over time.
It is periodically required to be sharpened and the surface of the cutting wedge to be formed. Depending on the purpose of the tool, the edge is formed:
- regular sharpening;
- or additional polishing of its surface.
Hairdressing scissors do not polish their edges when sharpening. Thin grooves made of fine-grained abrasive materials located on the inlets hold hair well when cutting.
Sharpening methods
A professional approach angle is formed on special machines in the factory. It must be preserved and maintained. The article does not discuss factory technology, but publishes simplified methods available to the home craftsman for bringing household models into working condition.
Scissor straightening tools
Sharpener
The blades of the scissors are spread apart and alternately pulled through the slot prepared in the tool. The supply metal is ground down with abrasive materials. Rotating disks can be used for this. All nicks and irregularities are removed to a single level.
Various types of sharpeners can be purchased through Chinese online stores.
Diamond needle file or file
When sharpening, scissors should be firmly 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 positioned in only one plane. This technique ensures 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, additional polishing of the lead with another tool may be required.
whetstone, whetstone, whetstone
It is advisable to disassemble the scissors, but you can also work in assembled form. The technology is the same as . The supply is placed on the surface of the sharpening stone, the blade is directed in one direction, and the same angle of inclination is maintained at all times. The abrasive material is periodically moistened with water, removing particles of cut metal.
The photo shows work on a homemade whetstone,
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.
Available means
Let's look at the most affordable sharpening tool:
- sandpaper;
- foil;
- steel wool;
- glass bottle neck;
- steel wire.
Sandpaper
Select 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.
Food or technical thin foil
The material is folded in several layers, cuts are made along the entire length of the blade.
Foil kitchen sponge
This method works according to the technology of the previous one. Scissors should work along the entire length of the blade.
Glass bottle
Grasping the neck with both blades, make cutting movements along their entire length in both directions. Surfaces are polished. Therefore, the plane of the inlets is positioned in the optimal direction for their alignment.
Needle, screwdriver or steel wire
By squeezing and unclenching the scissors, they are simultaneously processed with force along the entire length of the blades with the inserted needle.
A characteristic feature of this tool is the curved blades of a curved shape. To process them without good metalworking skills and round fine-grained needle files with diamond coating It's better not to start.
If your nail scissors start to work poorly, try this first:
- tighten the screw fastening of the rotation axis;
- inspect the gap between the cutting edges of the leads;
- polish with a needle.
If you have any questions, ask them in the comments.
The most effective repair of plastic is based on the example of hand scissors, in which one of the handles broke due to excessive force. I will tell you about a method for restoring 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 best of all gel - it does not spread);
- Paper tape;
- Soldering iron;
- A piece of stranded wire.
Preliminary restoration by gluing
First you need to restore the geometry of the broken handle. To do this, glue it together with superglue, following the rules for performing the work - the substance is applied to both surfaces, and after the start of the reaction with the plastic, they must be pressed tightly together until completely hardened. 
In order not to sit for several hours with scissors in your hands, we use paper tape to fix the broken handle. 
Connection reinforcement
Once the glue has dried, 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 a copper wire with a cross-section of 2.5 mm and cut 1 cm from the edge. Then it must be placed on paper tape, gluing only half, and then placed in the center of the glued joint and glued to the scissors with the same tape. Thus, on one side of the fault, the wiring harness will not be covered by anything. 
Next, using 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, leveling the traces of our intervention. 
Then we repeat the procedure with the other edge of the tourniquet, after removing the tape. The wires should be completely immersed in the plastic; no protruding wires should be left. At the end of the work, we level the entire surface of the area where the reinforcement was carried out. 
Reinforced connection on both sides. 
Safety precautions
When working with a soldering iron, you should take precautions - the part above the handle is very hot, and the tip has the melting point of tin and can cause severe burns if it comes into 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 sushi stick - it is made of wood and quite strong. To cut it, you have to put in a lot of effort, but the restored connection showed excellent results in this experiment, withstanding a fairly serious load.
Restoring plastic using reinforcement is a completely simple procedure, but very effective. In any case, now you definitely won’t have to throw away the scissors. 
Watch the video
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