How to eliminate chuck runout in an electric screwdriver. With our own Hands
Nowadays many people use such a tool as an electric screwdriver, so the high demand for them is not surprising.
Very often the device fails, and the buyer rushes to the repair shop, giving for the repair money.
You do not always want to do it, of course, so in our article we will help you learn more about the device of an electric screwdriver. Some problems can be solved by yourself.
We will examine the various cases of failure of an electric screwdriver, namely: let’s deal with the most frequent failures of such an important part of the tool as a chuck.
Chuck of an electric screwdriver: Description, function
The chuck is a metal cylinder with a cavity inside that has a ring and a regulating sleeve. It is fastened to the shaft. The drill bit or grinder is held securely in the chuck for later use.
The locking of the working body of the tool (drill bit) is provided by the thread. The drill in it is tightened in two ways.
The first method consists in tightening it with a special wrench, in the second method the drill bit is tightened by turning the chuck in the opposite direction to the axis of rotation of the drill bit.
How to disassemble the chuck of an electric screwdriver
Despite the fact that there are many models of screwdrivers on the market today, their general approach to the removal of such an element as a chuck is the same. We will now describe it briefly.
In order to unscrew it, you need to remove the screw securing it to the shaft. It is inside the chuck and you have to turn the screw clockwise. After you have unscrewed the screw, jerk the chuck backwards with a jerk.
Attention! When trying to unscrew it manually, you need to put the drill on the second speed if it is two-speed. It is advisable to lubricate the screw when purchasing the tool with machine oil.
In some cases when this element does not yield then you need to put the tool on the first speed, clasp it in your hands, reverse to the left. The chuck should come off easily.
How to change the chuck of an electric screwdriver
It is not easy to change it for untrained user, because you can not do it with bare hands without a special tool. There are two ways to remove it, and we will discuss them further in our article. In order to change it, you should pay attention to the actions that we described in the article above. The following tools are used for disassembly:
- Hex key. usually a 10 mm L-shaped metal rod. You fix its shorter part in the holder and fix the longer part in something like a table. Turn the chuck and then remove it with a twist of the wrench.
We’ve looked at the wrench method of disassembly. The way to remove the element manually is described above.
Important! In severe cases of jammed moving parts, you will have to dismantle the tool body and remove the spindle with its gearbox and chuck.
For this you will need a vice in which you will clamp the tool and a pipe wrench that will unscrew the chuck. It is easier to perform this task to use the recesses designed for the insertion of a wrench.
But they are not found on all models, so you have to cope with the above method.
This is a moving element of the tool, which consists of many rubbing parts. In the process of work, it is subject to wear and tear resulting from the action of friction forces, impact forces and other factors.
Runout of the chuck and its excessive backlash can scare an inexperienced technician. In some cases it is not always possible to find the time or finance to go to a repair shop.
Therefore we will consider how to repair various tool defects by our own efforts.
Repair of an electric screwdriver with your own hands in case of chuck play
A small backlash in the range of 1 mm usually does not create visible problems in operation. Pay attention to the condition of the gearbox if it is larger. So, the procedure is as follows:
- Unscrew the bolts fixing the upper cover of the tool. Remove it.
- Unscrew the electric motor from the gearbox. Inspecting the fasteners.
- Disassemble the gearbox. Often the cause of the failure is a faulty bushing inside the. It is possible to remove the sleeve using the steps described at the beginning of this article (see how to remove the chuck manually). Bushing can be easily pressed out by hand.
- We replace the bushing. Then assemble everything in the following sequence: sleeve, shaft, sleeve bearings, circlip. Lubricate rubbing parts.
- After that, reassemble the gearbox in reverse order. Attach it to the electric motor.
- Assemble the body of the electric screwdriver.
Repair of electric screwdriver with its own hands in case of chuck run-out
The main culprit of this problem is the gearbox of the electric screwdriver. To be sure of this, you need to remove it by disassembling it in the above way. This particular breakdown may indicate several problems in the gearbox, which we’ll point out below. The cause may lie in:
- Geometry of the gearbox shaft is not correct;
- The bushing can be easily pressed out by hand;
- bearing defects in the shaft support;
- wear of the pins that fix the planetary gear satellites.
The above parts are only produced in factories, so you can’t make them yourself. You only have to buy them and replace them.
Electric screwdriver chuck threads
This movable element is fastened structurally in the tool body in three ways:
Fastening with the help of Morse cone is known for a long time and consists in the following. The shaft has a cone shape, repeating the outline of the surface inside the chuck. the same cone. By combining them in a specific way a secure connection is obtained.
Connection of the shaft and the chuck by means of a threaded joint consists in the presence of a thread on the end of the shaft, onto which the chuck with the same thread can be freely screwed.
The locking screw is most often used as an additional fastener. Its head is notched for a Phillips screwdriver and has a left-hand thread. This screw you can see by unscrewing the cams that cover it.
Design of a chuck for an electric screwdriver
Classic chuck for a standard electric screwdriver is made in the form of a hollow metal cylinder, which is equipped with a ring with a regulating sleeve, this component in an electric screwdriver is mounted directly on the shaft.
Next, with its help drills are mounted, grinding attachment. The threaded or tapered surface ensures reliable fixation of the component. There are two main types of such a part:
Usually the key type is considered the most reliable. It holds the drill bit better.
Particularly recommended for heavy components with large diameters. Quick-clamping, however, allows you to change such parts as easily as possible, even if the work should not use a drill, but a grinding attachment. In operation, it is the safest.
Diagram of a drill and its chuck
Since each device has, in general, its own advantages and disadvantages, there is no specific, more preferable type of chuck at the present time. to the menu
1.1 Which attachments can be used with an electric screwdriver chuck?
A set of nozzles for the work of such a device depends on what kind of work is performed with it by the craftsman. These typically include the following:
- Cross bits of various articles; for self-tapping screws;
- hexagonal drill bits under the appropriate notches on the heads of screws;
- devices for installing bolts, nuts;
- triangular bits;
- Stud specimens under regular screws;
- special drills for work on drywall (with special limiters, not allowing to spoil the material in case of careless work).
You may also have a sanding attachment in your kit. It is important only when buying this part to identify with which particular chuck can be used, so that it is easy to use.
Immediately after replacement, it is recommended to additionally recharge the power supply and only then return the device to work and test the drill. Please note, the charge before further work must be 100%.
You can then test a new bit, sanding attachment. to the menu
How to correctly remove the cartridges from the drill and screwdriver: detailed instructions
The process of removing a chuck from a drill or screwdriver takes a few minutes and is done by simple manipulation. Of course, if the tool and its operating head are caked, then you will have to sweat. The method of removal may depend on the type of model, brand, as well as the method of attachment.
To disassemble the device with a similar connection method, you need to follow a few steps from the above algorithm:
- Unclench the jaws of the head to the maximum expansion. A screw should show up inside. It can be of various head types. Usually an allen key.
- To remove the cartridge, unscrew the fastener with the appropriate wrench.
- If you can’t remove the fastener smoothly with the hexagon, you need to twist it clockwise. If necessary, you can jerk or punch the wrench.
- If this fails, it is possible to clamp the tool in a vice and use a wrench to remove the screw that holds it in place.
There are screwdriver models that have grooves in them. They make it easier to remove the chuck.
The quick-action fastener
This option involves the use of a small allen key. Insert the wrench into the bore of the cartridge and turn clockwise. Sometimes it may have to be pressed down or thrown against a hard surface.
After the first turn is complete, you must gently continue to remove the chuck from the shaft of the drill or screwdriver. Please note that with the same method of fastening, all methods are considered similar for both tools.
Features for single socket fasteners
To remove the chuck with a single fastener sleeve, use a screwdriver or a knife to help separate the sleeve. When this part is disconnected, it is possible to remove the ring. This is easier than detaching the coupling.
The metal ring is pressed on a cone and is removed using a bolt and then gently pressed out using cams. Then, the ring is squeezed out with a crescent-centric thrust to fully remove the chuck.
The subtleties of disassembling dual-coupling fasteners
Double clutch cartridges are removed in a similar way, only the number of steps in the algorithm will increase. On all designs, the sleeve is removed in a similar way with a fixing screw.
For a detailed review watch the following video.
How to remove a chuck with a taper mount
To get the taper chuck out, there are a few simple steps to follow:
- clamp the wrench (hexagon) in the designated hole with the short end;
- start the unit in operating mode and wait for the spinning process to start;
- Remove the hexagon and remove the chuck by hand. It is turned according to the threads provided by the factory on the cone and the base of the chuck.
If neither method was successful and disassembly of the working head is unsuccessful, you may attempt a full disassembly of the tool.
when fully disassembling the drill or screwdriver, you can immediately lubricate all moving parts with machine oil, if necessary clean the contaminated mechanisms.
Sizes and marking
Before disassembling an electric screwdriver, it is necessary to determine the type of attachment of the cylinder. This will be indicated by the marking. The inscription of the type 1-6B14 indicates the type of fixation of Morse cone, where figures before the letter are the diameter of the bit shank in millimeters, and after. the size of the conic hole. There are 9 articles. from B7 to B45.
For chucks with threaded attachment there is a marking of the type 1,5-13 M12x1,25. Here, too, the numbers before the letter indicate the permitted diameter of the bit’s tail end, and the thread dimensions in millimeters after the letter.
Important! Foreign screwdrivers use a marking in inches. it looks like this: 2-13 1/2. 20 UNF. 1/2 means inch, and 20 means the number of threads per inch.
Sizes and markings
Before you disassemble your electric screwdriver, you must determine which type of mount it has. This will be shown by the marking. The inscription of the type 1-6B14 indicates the Morse taper fixation type, where the digits before the letter stand for the bit shank diameter in millimeters and after the letter. for the size of the tapered hole. There are 9 references ranging from B7 to B45.
For chucks with threaded fitting there is a marking corresponding to the form 1.5-13 M12x1.25. Here, too, the numbers before the letter show the permissible diameter of the bit’s tail end, and the thread dimensions in millimeters are after the letter.
Important! Foreign screwdrivers use a marking in inches. it has this form: 2-13 1/2. 20 UNF. 1/2 means an inch, and 20 is the number of threads per inch.
Cylinder with threaded attachment
Peculiarities of repair of the motor
Screwdrivers have direct current motors, which use a cylindrical body with magnets. An armature with a winding and brushes are located in the housing. To check the motor, you should disconnect the gearbox and the wiring that comes from the button, and measure the resistance of the armature winding with a tester. If there is no reading, it indicates that there is a breakage, and in the case of an extremely low value we can talk about a short circuit. Resistance values must be measured at the end of the shaft and the surface of the plate. It must be greater than zero. An armature malfunction causes the tool to shut down during operation, and loss of power, sparks, and smoke can also occur.
It is not uncommon that if the motor breaks, the pinion may be serviceable. Since many engines have a pressed pinion on the shaft, it is quite difficult to remove it. To do this, you can use a special puller or use improvised means. Do not use pliers or a nail gun for this purpose, as it is fraught with bending the shaft and damaging the gear teeth.
- You can take a profile or channel and make a longitudinal section on it with an angle grinder.
- Insert the shaft into the groove slot perpendicular to the profile and pry the pinion.
- Place the profile on the two bars so that there is a dangling motor.
- Use a nail and hammer to gently tap the pinion from the shaft.
- The removed gear must be put on the shaft of the new motor, using a hammer and hard surface for putting it on.
How to remove the chuck
To remove the chuck, it is necessary to perform only a few manipulations. This is quite an easy process. First you need to find a 10 mm hexagon wrench.
The wrench must be gripped very well in the chuck with the shorter end.
- Now you can turn on the screwdriver for a time that will be long enough for the key to hit the table while turning.
- The socket will turn on the internal thread with which it is secured to the shaft.
This is one of the most common options. But there is another effective way that you can try. Unclench the cams completely and look inside. In the case where a screw will be installed inside, this will be considered as an additional attachment that will lead to the shaft. You need to unscrew the screw completely. This should only be done in a clockwise direction.
Clamp the hexagonal socket firmly and turn it counterclockwise as hard as you can. The cartridge should unjam as a result of these actions. If this does not happen, you need to take a hammer and hit the wrench. Do it as carefully as possible so as not to damage the construction.
Sometimes it happens that none of the above methods help to solve the problem. Then you will have to completely unscrew and disassemble the entire tool, and then remove the spindle with chuck and gearbox from the structure. Everything that is left should be well clamped in a vice, and then the chuck can be removed using a wrench. It is worth noting that clamping must be very careful: there is a risk of machine breakage due to too much effort.
It’s worth noting that some screwdriver models have grooves that make it easier to remove. But this is quite rare in modern tools.
The chuck can become jammed if the tool has overheated too much. That’s why it is necessary to periodically let the machine have a rest. It is also worth taking care that the cartridge doesn’t start to “kick”. This can also be the cause of malfunctioning.
Solutions to chuck problems
You don’t necessarily need to replace the defective chuck for a new one.
Let’s see the main problems related to chucks and how to solve them.
One of the most common problems is the device jamming.
Over time, the cams stop completely clamping.
clamp the cylinder in your hand and sharply strike it one or more times against a hard object (preferably wood); this method works with tight “clamps”; clamp the body in a vice and the chuck with a gas wrench; then put the tool on the table and turn on the electric screwdriver; try to carefully lubricate the element; this is a fairly common case of Bosh products.
A common cause of tight clamping is sawdust and other small debris trapped inside the mechanism.
If a cartridge is supposedly jammed thanks to sawdust, the part can be held over a fire or dried with a construction hair dryer.
The chuck should then be carefully lubricated.
It also happens that the element is twisted.
The cause of the problem can be found in problems with various parts of the tool.
If it is the chuck that is at fault, there are probably worn out teeth on the locking collar.
To solve the problem, you can remove the socket and drill holes in places where the teeth are worn out.
Then screw the screws into the sockets and use wire cutters to remove the protruding parts.
Then the removed element is returned to its place and the mechanism is tested.
Incomplete withdrawal of the cams or one or two of them is another common problem.
If it is the quick-release chuck or key mechanism that is jammed, then the cause is either worn teeth on the jaws or stripped threads on the nuts that clamp the three components.
To find out what’s wrong, the cylinder has to be disassembled.
After disassembly, you can see the nut, which consists of a pair of parts.
Worn threads lead to slippage of the cams when clamping.
The result is incorrect alignment of the elements.
The solution is to replace the nut or cams with new ones.
In that case you have to buy a new chuck.
In some situations the problem can be solved without unscrewing the cylinder.
Others require disassembly of the device.
There are also situations that require the complete replacement of the mechanism.
But almost always the problem can be solved without replacing the whole electric screwdriver.
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