Repair rotor rotary Makita

If you have determined that your rotary hammer has a rotor out of order and you do not have the means for a new one, or there is a desire to resurrect the detail with your own hands, then this instruction is for you.

The Makita perforator device is so simple that repairing the Makita 2450, 2470 is not particularly difficult. The main thing is to stick to our advice.

By the way, the repair of the puncher with their own hands can be performed by almost every user who has the initial skills of locksmith.

Where to start?

As the device of the perforator is simple, the repair of the makita perforator must begin with its disassembly. Disassembly of the puncher is best performed according to the already checked order.

Punching disassembly algorithm:

• remove the back cover on the handle;
• remove electric carbon brushes;
• disconnect the body of the mechanical unit and the stator housing;
• from the mechanical unit disconnect the rotor;
• from the stator housing remove the stator.

Remember, the stator housing is green, the body of the mechanical unit with the rotor is black.

Detaching the rotor from the mechanical unit, we proceed to determine the nature of the malfunction. Rotor Makita HR2450 pos.54;article 515668-4.

How to find a short circuit in the

rotor As you are performing self-repair of the rotary hammers, you need the
electric circuit of the Makita 2450, 2470 rotary hammer.

The Makita 2470, 2450 rotary hammers use alternating current electric motors.

The collector motor integrity determination begins with a general visual inspection. The damaged rotor pos.54 shows traces of burnt winding, scratches on the collector, traces of burning on the collector lamellae. A short-circuit can only be determined at the rotor, in the circuit of which there is no breakage.

It is best to use the special IR-32 instrument to determine the short circuit( short circuit).

indicator After verifying that the rotor is short-circuited between the turns, make sure that the rotor is in use before disassembling it.

Before dismantling, always lock the winding direction. This is done very simply. Looking at the end of the rotor from the collector, you will see the direction of winding. There are two winding directions: clockwise and counterclockwise. Fix and write down, these data you will need for self-winding. The rotor of the Makita rotary perforator has the clockwise direction of winding, right.

Order of disassembly, repair, assembly of rotor perforator

Here is the sequence of repair of the rotor with short-winding:

• Trimming of the frontal part of the windings;
• Removing manifold and frontal parts and measuring the diameter of the wire being removed;
• Remove and clean the groove insulation with counting the number of turns in sections;
• Selection of a new collector;
• Install a new collector;
• Manufacturing of blanks from insulating material;
• Installation of sleeves in the grooves;
• Anchoring;
• Pinout;
• Heat shrink process;
• Reservation of the shell;
• Impregnation of the shell;
• Collector impregnation;
• Milling of grooves in the collector sipes;
• Balancing;
• Rotor cleaning and grinding.

Now consider everything in order.

Stage I

At the first stage with an anchor, the collector must be removed. The collector is removed after boring or sawing the frontal parts of the winding.

If you are self-repairing the punch, then you can cut the frontal parts of the winding with a metal hacksaw. Having clamped the rotor in a vice through aluminum gaskets, cut the frontal parts of the winding around the circle, as shown in the photo.

Stage II

To release the collector, the latter must be clamped with a gas wrench behind the lamellas and cranked along with the trimmed frontal part of the winding, turning the key in different directions.

The rotor is clamped into the vise through the soft metal gaskets.

Similarly you shoot the second frontal part using the gas key.

Always monitor the clamping force of the rotor in the vice, constantly tightening the clamp.

Stage III

When you remove the collector and the sidewall of the winding, proceed to remove wire debris from the grooves, traces of insulation. It is best to use a hammer and an aluminum or copper chisel. The insulation must be removed completely, and the groove surface must be sanded.

insulation But before you remove the traces of the winding from the groove, try to calculate the number of turns stacked in several grooves. Use a micrometer to measure the diameter of the wire used. Be sure to check how much percent the rotor grooves are filled with wire. With a small filling, a wire with a larger diameter can be used for a new winding.

By the way, the insulation can be cleaned by wrapping a piece of wood with the sandpaper of the desired profile.

Select the new manifold of the desired diameter and design. The installation of a new collector is best done on a wooden bar, by placing the rotor shaft vertically on it.

Push the collector onto the rotor, gently press the hammer through the copper head to press the collector into the old place.

collector fitted. For the production of insulation sleeves, use electrical cardboard, sintoflex, isoflex, lacquer. In short, what is easiest to buy.

Now the most difficult and responsible.

How to wind the rotor with your own hands.

Rotor winding is a laborious and complex process and requires perseverance and patience.

There are two variants of winding:

• Self-manual without tools for winding;
• With the use of the simplest devices.

Variant I

In the first variant, it is necessary to take the rotor in the left hand, and the harness of the desired diameter and the required length with a small margin in the right one and reel, constantly monitoring the number of turns. Rotate the winding clockwise from yourself.

Widget from SocialMart

The winding order is simple. Secure the beginning of the wire by the bearing, thread into the groove of the lamellae and start winding in the groove of the rotor in front of the groove of the lamellae.

Variant II

A simple tool can be assembled to facilitate the winding process. It is advisable to assemble the device when winding anchors more than one.

Here is a video of a simple device for winding the rotors of the collector motor.

But you have to start winding with the preparation of data.

The data list must include:

1. Rotor length = 153 mm
2. Collector length = 45 mm
3. Diameter of rotor = 31.5 mm
4. Diameter of the manifold = 21.5 mm
5. Diameter of the wire =
6. Number of grooves = 12
7. Coil pitch = 5
8. Number of sipes on the collector = 24
9. Direction of winding of the rotor coils = right
10. Percentage of groove filling with wire = 89

The length, diameter, number of slots and number of slats can be obtained during the disassembly of the rotor.

Measure the wire diameter with a micrometer when you get the winding from the rotor grooves.

All the data you need to collect during the disassembly of the rotor.

Algorithm for winding the rotor

The winding order of any rotor depends on the number of grooves in the rotor, the number of lamellas of the collector. The winding direction you set before disassembling and sketched.

On the collector, select the reference lamella. This will be the beginning of the winding. Mark the starting point with the help of nail polish.

When disassembling the rotor, we determined that the rotor has grooves 12, and the collector has 24 lamellae.

And we also found that the winding direction is clockwise, if viewed from the collector side.

Having installed in the grooves insulating sleeves from the electrocardboard or its analog, soldering the end of the winding wire to the lamellae No. 1, start winding.

The wire is placed in the groove 1 opposite, and returns through the sixth slot( 1-6), and so to the desired number of turns with a pitch of z = 5.The middle of the winding is soldered to the lamella No. 2 clockwise. The same number of turns are wound in the same section, and the end of the wire is soldered to the lamellae No. 3.One coil is wound up.

The beginning of the new coil is produced from the lamellae No. 3, the middle part splits onto the lamellae No. 4, winding into the same grooves( 2-7), and the end on the lamellae No. 5.And so up to that state, when the last coil does not end on lamellae # 1.The cycle is closed.

Soldering the ends of the windings to the collector sipes, we turn to the rotor armoring.

The process of booking the rotor shell

The rotor is reserved for securing the windings, lamellas and ensuring the safety of the rotor and its parts when operating at high speeds.

Armoring is the technological process of fastening the rotor coils with the help of a mounting thread.

Impregnation process for rotor coils

The impregnation of the rotor should be carried out with an AC connection. This is done with the help of LATR.But it is better to do such a procedure with the use of a transformer, on the winding of which an alternating voltage is applied through the LATR.

Photo of impregnation with LATR

The problem is that when the alternating voltage is applied, the turns of wound coils are vibrated and heated. And this contributes to better penetration of insulation inside the windings.

It is recommended to use epoxy adhesive as an insulating material.

The glue is heated in accordance with the instructions. Apply epoxy glue to the heated winding of the rotor with a wooden spatula.

Makita 2470 Rotary Impactor Impregnation at Home

After thorough impregnation, allow the rotor to cool. In the process of cooling, the impregnation will harden and become a solid monolith. You will have to remove its stains.

The process of stripping the collector from surplus impregnation

No matter how carefully and carefully applied the impregnation, its particles fall on the collector's lamellas, flow into the grooves.

At the next stage, all slots and lamellas must be carefully cleaned and polished.

The grooves can be cleaned with a piece of hacksaw blade, sharpened as for cutting Plexiglas. A sweep of the lamellas can be done with fine sandpaper, holding the rotor in the holder of the electric drill.

The surface of the lamellas is first cleaned, then the manifold grooves are milled.

We now turn to the balancing of the anchor.

Armature balancing process

Mandatory balancing of anchors is performed for a high-speed tool. The perforator Makita is not that, but check balancing is not superfluous.

Properly balanced rotor will significantly increase the running time of the bearings, reduce tool vibration, and reduce noise during operation. Balancing is performed on knives, two guides exposed, to the horizon using a level. The knives are set to a width that allows the assembled rotor to be laid on the shaft. The rotor should be strictly horizontal.

If the balance of the rotor is broken, it will always occupy a position where excess weight will be lower. To compensate, it is necessary to push the load under the spool from the opposite side, so that it does not go beyond the diameter of the rotor. And you can drill excess metal from excess weight.

So, rolling the rotor on the knives, you can carefully balance it.

Everything! The rotor is ready for installation.