Build Daily


August 12, 2017 18:08

Rotor Repair punch Makita


  • 1 Where to start?
    • 1.1 How to find a short circuit in the rotor
  • 2 order of dismantling, repair, rotor punch
    • 2.1 assembly as wound rotor with your hands.
    • 2.2 Book rotor shell
    • 2.3 process of impregnating the rotor coils
    • 2.4 process of stripping the collector of excess impregnation
    • 2.5 process armature balancing

If you determine that yourpunch faulty rotor, and means a new you do not have, or have the desire to resurrect the piece with your hands, then this guide is for you.

device Makita rotary hammer so simple that repairs Makita 2450, 2470 does not cause much difficulty.The main thing is to stick to our advice.

By the way, repair the gun with their hands can perform almost every user with initial locksmith skills.

Where to start?

Since the device simple punch, the punch makita repair should start with disassembling.Dismantling the gun is best done on the already proven procedure.

disassembly algorithm punch:

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

Remember stator body green body mechanical unit with the rotor in black.

disconnected from the mechanical rotor unit, turn to the definition of the nature of the fault.Rotor Makita HR2450 poz.54;Article 515668-4.

How to find a short circuit in the rotor

As you produce independent repair drills, you need
circuitry punch Makita 2450, 2470.

The rotary hammers Makita 2470 2450 used collector AC motor.

Definition commutator motor integrity begins with a general visual inspection.At a faulty rotor poz.54 traces of burnt coil, scratches on the manifold traces of burning on the commutator bars.Short-circuiting can be determined only at the rotor, in which circuit there is no interruption.

to determine the short-circuit (SC) is best to use a special device IR-32.

Check armature short-circuit with the help of the indicator

Checking armature short-circuit with the help of a home-made display

Satisfied with the help of this device, or device improvised, is that between the rotor windings short circuit, proceed to its dismantling.

Rotors before dismantling

rotors before dismantling

necessarily fix the winding direction before disassembling.This is done very simply.Looking at the rotor end by the collector, you will see the winding direction.Directions winding there are two: clockwise and counterclockwise.Secure and record the data you definitely need for self-winding.We Makita rotary hammer rotor winding direction clockwise, right.

order of disassembly, repair, assembly, rotor punch

Here is the sequence of the rotor repair short circuit windings:

  • Trimming the frontal part of the windings;
  • Removing the collector and the coil ends and the measurement of the diameter of the wire to shoot;
  • removal and cleaning of the isolation grooves with counting the number of turns on the slices;
  • selection of a new collector;
  • Installing a new collector;
  • blanks Manufacture of insulating material;
  • Installing cartridges into the slots;
  • armature winding;
  • Pin layout;
  • shrinking process;
  • Reservation shell;
  • impregnation shell;
  • impregnation collector;
  • Slotting lamella collector;
  • balancing;
  • Stripping and rotor resurfacing.

Now look at everything in order.

Phase I

At the first stage it is necessary to remove the anchor collector.The manifold is removed after boring or cutting end windings.

Cutting end windings

Cutting frontal parts

winding If you are self-repair the gun, then sawed the end winding can be using a hacksaw for metal.Clutching the rotor in a vice through the aluminum pad, Saw circular end winding, as shown in the photo.

Phase II

To release the reservoir, the latter have to hold the key for the gas and turn the slats together with the trimmed end winding, turning the key in different directions.

The second way to remove the reservoir and the front parts

second way to remove the reservoir and the front parts

rotor with the clamp in a vice through a soft metal gasket.

Collector remove

collector shot

Similarly shooting and a second frontal part using a pipe wrench.

Always check the rotor locking force in a vise, constantly pulling clamp.

Stage III

When you remove the collector and the sidewall of the winding, proceed to remove the wire from the slots residues, traces of insulation.The best thing to do to use a hammer and chisel aluminum or copper.The insulation must be completely removed and the surface grooves tipped sandpaper.

We clean the grooves of the insulation

We clean the grooves of the insulation

But before you remove the traces of the winding groove, try to count the number of coils, arranged in several grooves.Using a micrometer, measure the diameter of the wire being used.Be sure to check up, how much percent of the slots are filled the rotor conductor.For a small filling can be used for a new winding wire of larger diameter.

Measuring the diameter of the wire before removing the wires from the slots

Measuring wire diameter before removing the wires from the slots

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

Pick a new collector and construction of the desired diameter.The installation of a new reservoir is best done on a wooden bar, the addition of a vertical rotor shaft.

shoved collector on the rotor, soft hammer blows through the copper nastavku drive in the collector to the old place.

Planted new collector

planted new collector

turn came to installing insulation sleeves.For the manufacture of insulation Insulating liners use, Sintofleks, Izofleks, varnished cloth.In short, what is the easiest to acquire.

Installing new cartridges in slots bare

Installing new cartridges in slots bare

Now the most difficult and responsible.

As the wind rotor with your hands.

rotor winding is time-consuming and complex process and requires perseverance and patience.

winding two options:

  • Self-winding by hand without tools;
  • using simple tools.

Option I

In a first embodiment, the rotor must be taken in the left hand, and harvested the desired wire diameter and required length with a small margin on the right and to wind, constantly monitoring the number of turns.The rotation of the winding itself clockwise.

Widget from SocialMart

winding Procedure simple.Secure the top of the wire for the bearing, thread the slats in a groove and start winding in the rotor groove opposite the groove slats.

Option II

can assemble a simple tool to facilitate the winding process.It is advisable to collect the device at more than one winding anchors.

Here's the video of simple devices for winding rotor commutator motor.

Device for winding anchor with counter number of turns

adaptation for winding the armature with the counter number of turns

But we must begin winding data preparation.

The list of data shall include:

  1. rotor length = 153 mm
  2. manifold length = 45 mm
  3. Rotor diameter = 31.5 mm diameter collector
  4. = 21.5 mm
  5. Wire diameter =
  6. Notches= 12
  7. Step coil = 5
  8. number of sipes on the collector = 24
  9. winding direction of the rotor coils = right
  10. percentage filling slots wire = 89

data length, diameter, number of slots and the number of slats you can getduring the disassembly of the rotor.

Wire diameter measured with a micrometer, pull out a coil when the rotor slots.

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

armature winding algorithm Makita

algorithm armature winding Makita

rewind algorithm rotor

any procedure for the winding of the rotor depends on the number of slots in the rotor, the number of lamellae collector.winding direction you set before dismantling and sketched.

On lamella collector, select the reference.This is the beginning of winding.Designate the start point lamella using nail polish.

Start winding

Start winding

When disassembling the rotor, we found that the rotor slots 12, and the reservoir 24 slats.

And we found that the winding direction clockwise, when viewed from the collector.

installing insulation in the slots of the sleeve of insulation or an analogue thereof, the end of the winding wire soldered to the slats №1, start winding.

wire 1 fits into the groove in front and returns via the sixth slot (1-6), and so on until the desired number of turns with a pitch z = 5.Mid winding soldered to the slats №2 clockwise.In the same section is wound the same number of turns, and the end of the wire is soldered to the slats №3.A coil is wound.

beginning of a new coil is made with slats №3, unsolder the middle lamella to №4, winding in the same slots (2-7), and at the end of the slats №5.And so to the state when the last reel is finished on the slats №1.The cycle has closed.

wound rotor

wound rotor

soldered ends of the windings to the commutator bars, go to the booking of the rotor.

Book rotor shell

Reservation rotor is made to secure the winding lamella and securing the rotor and its parts when working at high speeds.

Proper securing winding before impregnation

Proper securing winding before impregnation

booking process is called securing the rotor coils with mounting thread.

process of impregnating the rotor coils

rotor impregnation should be performed with a connection to the AC network.This is done by Latro.But it is better to do this procedure using the transformer, the coil is supplied by an alternating voltage LATR.

Photo impregnation Latro

The problem is that when an alternating voltage coils wound coils vibrate, heat.And it contributes to a better penetration into the insulation windings.

As the insulating material is recommended to use an epoxy adhesive.

Epoxy adhesive

Epoxy adhesive

Grown glue in the warm state in accordance with the instructions.Apply epoxy glue on the heated rotor winding with wooden blades.

impregnation rotor punch Makita 2470 at home

After thorough impregnation allow the rotor to cool.In the process of cooling the impregnation hardens and becomes a solid monolith.You will need to remove it drips.

process of stripping the collector of excess impregnation

How would you not carefully and accurately applied impregnation, its particles fall on sipes reservoir flows into the grooves.

In the next stage, and all the necessary grooves and sipes thoroughly cleaned, zapolirovat.

grooves can be cleaned with a piece of the saw blade, sharpened for cutting Plexiglas.A sweep of the slats can be made with fine sandpaper, hold the rotor in an electric socket.

first trimmed surface of the slats, then milled grooves collector.



turn to the balancing of the armature.

process of balancing the armature

Compulsory balancing anchors made for vysokooborotisty tool.Hammer Makita is not, but check the balance is not superfluous.

properly balanced rotor will significantly increase the time of bearings reduce vibration tools reduces noise rabote.Balansirovku perform at loggerheads, two exposed rails, using the horizon level.The knives are mounted on a width that allows to lay the assembled rotor shaft.The rotor should lie flat.

Balancing by drilling a metal surplus

balancing by drilling a metal surplus

If disturbed balance of the rotor, it will always take a position at which the weight is below.To compensate for the need to stick to the opposite side of the gasket load coils, so that it does not extend beyond the diameter of the rotor.Can Drill excess metal from overweight.

For rolling rotor with knives, you can it carefully balanced.

All!The rotor is ready for installation.