The jigsaw is sawing crooked how to fix. Quality of assembly and jigsaw parts wear and tear – the causes of crooked sawing

The jigsaw is cutting awry, how to fix it

The difference between the variants of the cutting part is the different lengths of the teeth. The quality of the workpiece also depends on their frequency. Prefer a trusted brand. Depending on the configuration of the teeth, there are the following classifications of saws:

  • Uniform spacing and direction of teeth is typical for standard products.
  • The variants with a skipped tooth are popular. The defect has a favorable effect on the cutting speed, which leads to less heating of the construction. The device does not jam and works well.
  • There are twin models that allow for better cutting of the workpiece.

Design and principle of operation

Let’s take a closer look at the construction of the jigsaw

Jigsaw design

Power Cord. Cord terminals. Trigger stop. Trigger. Speed regulator. Eccentric hinge. Cooling fan. Gearbox. Pendulum action regulator. Pendulum mechanism. Jigsaw. Safety limiter. Saw’s supporting roller. Air duct. Base plate. The electric motor. Sawdust outlet. Base plate adjuster.

In simple jigsaws, the jigsaw moves up and down only. And if you use a pendulum mechanism even backwards and forwards. This tool cuts faster. How the vertical movement is formed? The motor transmits its rotation to the gear wheel. There is an eccentric pivot attached to it that creates up and down motion. The base plate presses and holds the tool on the work surface, eliminating hand tremors. Sawdust is blown away by the cooling fan and blown out through a dedicated outlet.

How wear and tear and high-quality workmanship influence the curvature of the cut

Not all workers know what to do if the jigsaw is crooked, how to correct such a defect. So, in case a cheap tool was purchased, it is worth thanking the manufacturer for the malfunction.

However, sometimes the fault lies on the shoulders of the worker, as modern manufacturers recommend using inexpensive devices for a maximum of 20-30 minutes per approach. Therefore, if there is a failure, the fault is most likely in the actions of the owner himself.

Quite a different situation when the defect is found in professional electrical appliances. In this case you should not rush and run with the tool to the repair shop, it is better to understand why the jigsaw blade saws crookedly and make the repair yourself.

  • Check to see if there is any play in the shaft. When its value is more than 0,9 mm, it means that the breakage is in its construction. Even the highest quality guides wear out with time, so you need to monitor their condition.
  • The blade is not fixed properly. This malfunction is often due to wear and tear of the fastening mechanism.
  • The guide roller is defective. it does not hold the material and vibrates, and therefore the jigsaw does not saw evenly.
  • The blade is deformed. If the saw blade is bent, it can no longer cut evenly.

Important! The cause of a crooked cut can also be dull cutting teeth of the blade, so you need to make sure that they are not frayed, because continuing to work in such a case is dangerous to your health.

Often the problem with a crooked cut is the curvature of the blade

Repair steps

It is not difficult to disassemble the tool. The housing separates into two halves, giving access to all parts of the mechanics. The first thing to do is to remove dirt and replace the grease, then you can begin repairing.

Replacement of piston rod bushings

Let’s note right away that there are no spare parts in the stores. You can find the appropriate part, buying a broken tool at a flea market. Parts from other devices and mechanisms are often suitable. For example, jigsaws with a circular rod exit are the easiest to repair. The round bushing is chosen, and if necessary the inner diameter is enlarged by imposition of a cone. This repair allows you to eliminate run-out and backlash of the spindle, to improve the quality of the cut.

If necessary unique fixation clamps can be made (it depends on the jigsaw model). Copper foil can be used as small pads when installing them in the housing.

Replacing the stem

In inexpensive jigsaw models the spindle is a thin metal plate with a complex shape. If overloaded it can simply burst. The part is interchangeable, some jigsaw models are compatible with others. The device should be carefully disassembled, fixing the process on the photo, in order to reassemble. Then with the removed part go to the market or to the store. Then install the part and apply grease.

Brush replacement

Most models of jigsaws, if we are not talking about frankly budget ones, come with a pair of pullers. To replace them, it is enough to open the housing: in the back of the motor, on the contact block, you can immediately see the necessary elements. Repair is elementary: old parts are carefully removed, contact pads are cleaned of dust, wiped with alcohol. After that you just have to install new brushes.

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Replacing the starter button with a speed regulator

Purchase a part for replacement can be both in specialized outlets and in stores that sell spare parts for electronic devices. The jigsaw body is opened and the workpiece in question is freed from the leads. It is often necessary to do this after unscrewing the screws of the terminals. There is no need to use a soldering iron. After removing the old part, the new part is placed and connected.

jigsaw, sawing, crooked, quality, assembly, parts

Disassembly of the housing and disassembly of the button is better to do before going to the store to buy exactly the same part for the landing place.

Rare faults include failure of the motor thermal fuse. The part is replaced. Sparks may occur, indicating not only a heavy load, but also worn brushes and a lack of lubrication. Periodic maintenance is therefore a prerequisite for reliable operation of the jigsaw.

Bosch GST 140 jigsaw

The device

The jigsaw is a tool that is suitable for working with a wide variety of materials:

The versatility of this great tool allows you to perform complex tasks that other tools would not be able to do. The saw blades are actively involved in the work, they are subjected to considerable mechanical stress, after a certain period of time out of order.

The jigsaw mechanism is also highly stressed. If such a unit is used regularly, you should know its layout, how it works.

The principle of this machine is not complicated, the main blocks are:

Air cooler, speed control, pendulum movement unit. these are all auxiliary holding elements that ensure the duration and performance.

In some models, the electric jigsaw is provided with a separate start button that can also regulate the torque frequency.

In terms of the transformation of electrical energy, there is such a process:

  • The electrical impulse, coming into the tool, goes to the brushes (they are made of graphite), which provides the appearance of torque on the rotor;
  • the rotation impulse is transmitted to the gearbox, a node that transforms the torque into progressive motion, which is routed to the piston rod.

In this scheme, a special role is assigned to the fastening assembly, which ensures a reliable connection between the stem and the moving blade.

As you can see, the principle of the electric jigsaw is the same for all models. only the quality of assembly, subassemblies and materials make the difference.

Knowing the “common ground” and the operating algorithm of the elements, it is easy to understand what faults and malfunctions can occur, and to know the reasons for them.

Jigsaw Orbital Blade Settings | Tricks of the Trade

How to learn how to saw straight with a jigsaw

To exclude curvilinear sawing with a jigsaw, it is necessary not only to eliminate all possible defects, but also to learn how to hold the tool in hands. It takes a lot of experience and if there is no time for training, then the difficulty is solved by using a guide rail for the jigsaw.

It should be noted at once that even when marking is not always possible to pass over it with the jigsaw as one would like. After all, when moving the tool it is necessary to control the movement of the blade, as well as pushing the device itself. When accuracy and flatness are important, the jigsaw guide comes to the rescue when working with the jigsaw. This is a special metal ruler in the form of a rule or water level, along which the jigsaw moves. To take advantage of such an addition, you can buy it or make it with your own hands.

jigsaw, sawing, crooked, quality, assembly, parts

The jigsaw guide has a special recess along which the tool moves. This tool is one to three to four meters long. If necessary, the length of the guide can be increased by attaching similar equipment. It is fastened to the workpiece to be sawn precisely along the cutting line. Either existing fasteners or a screw clamp are used for fixing. Approximate and higher, which depends on their length and additional functions. attachment and the presence of a rubberized base.

Main tool faults

How to tell if your jigsaw needs repair or preventive maintenance? There are a number of signs that you need to pay attention to:

  • the body began to warm up too much when working;
  • when switching on and further operation, uncharacteristic sounds are heard;
  • Collector brushes are sparking;
  • motor cannot be adjusted, other faults are present.

Electric jigsaw stem guide bushings replacement.

When the above symptoms are found, you must immediately turn off the jigsaw, then inspect it to determine the fault. All types of these breakdowns can be roughly divided into 2 large groups.

  • Factory defect in the form of rotor breakdown (cannot be repaired, you need to contact the service center).
  • The stator or rotor becomes very hot during use, and melting of the insulation is observed. Cause: dust, dirt, or improper load.
  • Brushes are worn out (replace them).
  • If the speed regulator does not work, it must be replaced. It is best to contact a craftsman.

Breakdowns in the mechanical part of the jigsaw:

  • Gear is found to have worn or deformed teeth. To repair the jigsaw is possible, you need to replace the entire gear, in the future you need to carefully monitor the load, the correct choice of blade.
  • The rod is broken, it has fractures. It is required to repair the jigsaw, replacing the rod, then the right choice of saw blades according to the type of material. For example, for wood or metal, only use specially designed devices.
  • The balancers that guide the rollers are worn out. Balancers need to be replaced and loadings need to be monitored.
  • If the bearings are worn out, they are replaced. It is best to consult a master.
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Other types of failure may also be observed. For example, the body can split if you hit it hard. The jigsaw must not be dropped, otherwise other parts of the jigsaw may be damaged. Motor breakdowns are best not to fix with your own hands, and immediately contact a service center. You can do the replacement of worn parts yourself. For this purpose, the manufacturer provides instructions, following it, you can easily cope with the work yourself.

Breakage of saw blade and saw blade clamping assembly: prevention, repair

The main characteristics of household jigsaws.

How to repair when a fault is detected? The bearing roller may break if the load on it is too great, i.e.е. Cutting technology is broken. The saw is attached to this roller, if it is broken, but it will not be possible to use the saw. To prevent breakage from occurring:

  • Only use high-quality hacksaw blades.
  • Do not use blunted saws.
  • Hacksaw blades should be selected only according to their intended use. For example, for metal, only the blade that is designed for that particular material is used.

If the roller is not replaced when it breaks, the equipment may jam during operation. The repair will not begin with replacing the roller, but cutting it with another tool and then replacing it. The repair itself is not too complicated. The bearing roller with traces of damage must be removed and then replaced with a new one that corresponds to the jigsaw model used.

The blade locking assembly usually breaks when it is exposed to large amounts of dust. During work, dust is not uncommon, so it is necessary to regularly clean the surface of the fixture for prevention. Over time, the situation will get worse, the equipment can completely fail. The repair usually involves replacing the fixture completely.

It consists of performing a number of actions:

  • The unit should be constantly cleaned and lubricated.
  • A dust bag should be used when working to prevent large amounts of dust from getting onto the tool.

What to do if there are accuracy problems

It is easy to disassemble the tool. Body splits in two halves to expose all mechanical parts. The first thing to do is to remove contaminants and replace the grease, after which you can begin repairing.

Replacing the piston rod bushings

Let’s note right away that there are no spare parts in the stores. You can find the appropriate part by buying a broken tool at a flea market. Parts from other devices and mechanisms are often suitable. For example, jigsaws with a circular spindle outlet are the easiest to repair. A round bushing is selected and the inside diameter is increased by tapered if necessary. This repair allows to eliminate runout and backlash of the rod, improve quality of the cut.

Unique clamping rings are also made if necessary (depending on the jigsaw model). When installing them in the case as small pads, you can use copper foil.

rod replacement

With inexpensive jigsaws, the spindle is a thin metal plate with a complex shape. If overloaded, it can simply burst. The part is replaceable, some jigsaw models are compatible with others. The device should be carefully disassembled, fixing the process in the photo to conduct the reassembly. Then with the removed part to go to the market or to the store. After that install the part and apply grease.

Replace brushes

Most models of jigsaws, if we are not talking about frankly budget ones, come with a pair of pullers . To replace them, simply open the housing: in the back of the motor, on the contact block you can immediately see the necessary elements. Repair is elementary: old parts are carefully removed, contact pads are cleaned from dust, wiped with alcohol. After that, all you have to do is install new brushes.

Replacing the start button with a speed regulator

You can buy a part for replacement at specialized outlets, as well as in stores that sell spare parts for electronic devices. The body of the jigsaw opens, the corresponding part is released from the wires. This often needs to be done after unscrewing terminal screws. There is no need to use a soldering iron with modern models. After removing the old part, the new part is inserted and connected.

Rare failures include failure of the thermal fuse of the engine. Part is replaced. Sparks may occur, indicating not only a heavy load, but also wear of the brushes and lack of lubrication. So periodic maintenance is the key to reliable operation of the jigsaw.

Conclusion if the jigsaw is not sawing properly what can be done

Definitely the tool should perform a straight and even cut, and if the cut is crooked with scuffs, it is considered a defect in the work. And the defect can be connected both with tool malfunction, and lack of experience at the master. To saw with the tool smoothly, you should check the jigsaw for suitability and absence of defects (if necessary eliminate them or adjust), as well as make sure the correct operation of the device.

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A Chinese one, allegedly made in Russia. If you work by hand I can not with all my efforts to saw straight. constantly drifts, sawing looks like this (top view):

I tried to saw with the frame against the support bar, screwed to the workpiece, the blade steered to the left until it jams. What can be the problem?sys or the jigsaw ?

In the same way as in the childhood a usual jigsaw needed to be directed, the movement of the jigsaw also needs to be corrected. To some extent, the exhibition of the saw’s plane at the right angle to the longitudinal axis of the tool can help to reduce the withdrawal.

And the word “try” is spelled with an O, not a Y, which may be the reason for all your failures.

I guess mine’s got more guts. the blades don’t jam. they just fly off.And it is impossible to cut evenly. it appeared on the second year. The guide roller is loose (tripped). if the blade is new. it still holds it in the groove, if there is a noticeable loss on the blade. it can even lose it. And along the axis of the roller there is a small possibility of movement, which also does not help.

Sometimes I miss the letters, and when I notice it, I correct it.

I bought a saw today. it seems like a decent one. OEM, which were enough to cut a couple of sheets of plywood, but there /-1 mm is nothing, and here began to saw parts /-0,5 mm

The saw’s plane at the right angle to the longitudinal axis of the tool.

And how ? Here are the photos. don’t kick me for out-of-focus on the last two. I’ll rephotograph them tomorrow, I have no energy today.

Wladimir_TS: The regular ones were enough to cut a couple of sheets of plywood

That’s how I used the block. and it takes the cut to the side of the block until the blade jams, regardless of the side. The regular blade (small, but larger than that in the picture) is completely blunted after about 7-8 meters of cutting 15 mm of plywood. Cutting without fanaticism.

Features of behavior pushing tool in weak hands will explain a simple experience: take a matchbox or something similar and try to move it along a straight line on the table, pushing it with a pencil. What is the trajectory? And try tying the box with string and pulling the box by the string. Now what is the trajectory?

Wladimir_TS: and moves the saw away from the bar until the blade jams

Now put the bar on the other side of the jigsaw and drive on the bar, if you can. The problem, in my opinion, is that the plane in which the saw goes is at an angle to the longitudinal axis of the jigsaw and tilted to the side with which the block was when wedged.And when you try to hold the jigsaw straight, along the intended trajectory, the plane of the saw and the trimmer blade cuts at an angle to the desired trajectory and there is a drift. It is possible to determine the slope of the plane of the saw by test cuts and keep the jigsaw, and firmly, so that the longitudinal line for the jigsaw trimmer was not along the desired line of the cut, but at a small, compensating angle.If it is supposed to use a guide, then it is necessary to attach a wedge to the sole of the jigsaw, on the side of the guide, with an angle that compensates the inclination of the plane of the saw.

You can also attach some kind of ruler-pointer, a laser pointer, to the sole, at the right angle to compensate the drift. Т.е. you try to hold the jigsaw so that the pointer is on the trajectory, which automatically compensates for tool drift.

What are the previews of such a gigantic size?? 180 px. it is quite normal.

And, among other things, you should take into account that the jigsaw is not a tool for straight cuts, but rather for shaped cuts. And the future straight end, cut with a jigsaw, will definitely require a grinder or cutter for leveling. Or, what seems obvious, you should use a circular saw.

Because for a straight cut, with self-alignment, the width of the saw must relate to its thickness, at least 1:20. 1:50 or more.

Adjustments The third setting is responsible for the amplitude of the pendulum stroke of the blade. Once the jigsaw stem.

TYPICAL ERROR when one presses the jigsaw to “force” it to cut faster than it can.Also, use your hands to rock the saw left and right (not back and forth, there’s a pendulum mechanism)!). If it dangles left and right, then it’s a cheap jigsaw for rough work. [judging by the photo, this is the one.]. It is necessary to take it into account, to cut with reserve and to finish the sawing edge with a hand router or in some other way.In straight hands, a good jigsaw can easily manage less than 0.5 mm deviation from a straight line.

sampa: the plane in which the jigsaw goes is at an angle to the longitudinal axis of the jigsaw

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