Build Daily


August 12, 2017 18:08

How to Recover a punch Makita collector


  • 1 How to polish the surface of the collector
  • 2 How to center the rotor in the drill before grinding
  • 3 process grinding
  • 4 collector How to clean the grooves collector punch
  • 5 How to control the condition of brushes

correct operation of the punch Makita 2450 with commutator motors is accompanied by a slight sparking brushes in collector area.We regularly operating motor sparks even with a short tail.

By changing picture sparks can determine the nature and location of the fault in the punch Makita 2450, 2470.

reasons for the increase in the collector sparking motor brushes may be malfunction and wear, short circuit or open circuit armature windings of the motor stator fault, failure or improper mountingbrush holders.

Significant sparks in the collector region leads to the appearance of furrows on a collector plate burning, uneven abrasion of brushes.

emergence of these defects causes rapid wear and production of slats of the collector.

The roughness of the above rules

roughness above normal

Since the punch is a powerful tool that allowed a small spark without load, with significant efforts on the tool may of running single sparks around.In case of heavy sparking need to find out the cause of a strong spark.

most common malfunction of the collector is an increasing roughness of the slats when amplifying sparking brushes.

Increased surface roughness collector punch Makita 2450 is not only due to the strengthening of sparks.On a copper plate collector is formed of copper oxide, carbon brushes hardness exceeding hardness.The magnitude of the roughness affects uneven brush wear and carbon deposits from the spark.

Scratches formed not only due to uneven wear of the brushes and the different structure of the material, but also falling into the solids of the working zone air.

punch Makita Improper storage can cause oxide on the copper plate collector due to high humidity or significant temperature fluctuations during operation.

to eliminate surface defects of the collector, it should be sanded.

How to polish the surface of the collector

Before finalizing collector punch Makita 2470, it is necessary to perform a balancing of the rotor.

Option measuring heartbeat collector relative to the rotor

Metering Option collector beats the rotor

At home, grinding collector punch Makita 2470 2450ili best done with sandpaper attached to a wooden board already balanced rotor.

end of the rotor shaft is mounted in the chuck drill through the soft copper or aluminum foil.Drill with the rotor fits securely in a vise or a homemade device.

rotating the rotor, try to center the drill chuck.

Installation of the rotor in the cartridge

rotor installation into the cartridge

How to center the rotor in front of the drill grinding

rotor centering chuck drills made to ensure minimum runout radial surface of the reservoir relative to the rotor shaft.

First check runout chuck jaws.Secure the drill in a vise, set in the cartridge of the large-diameter drill.

Rotating drill, move to the side surface of the rotating drill pencil, placing it on a simple fence.At the minimum heartbeat pencil will outline to drill the surface of a solid line.If palpation significant, change in the drill chuck, or pick up a drill chuck with a lower beating.

Now, instead of a drill, hold the rotor shaft and in the same way to determine the rotor runout space or manifold.

grinding process collector

process of grinding the collector must begin with the selection of emery material.For grinding collector is recommended to use sandpaper or a needle file.

Choose sandpaper several rooms ranging from №100 above.

now proceed to grinding.With a wooden block to the collector with a fixed abrasive paper, rotate the drill and not much holding block to the collector surface, grind.

Grinding collector drills

Grinding collector drills

grinding operation is recommended to use an already working rotors with low output of the collector.

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Proper sparking brushes

Proper sparking brushes

If you have made on the rotor punch Makita 2470 replacement of the collector, after its attachment to the shaft, the collector should be pierced.This operation is performed to eliminate the radial run-out surface of the slats of the new reservoir with respect to the armature shaft.

eat through manifold best on a lathe using mandrels.But it is possible to perform this operation, and in the home.However, without an additional device is not oboytis.Video help understand the manifold groove.

Typically, brush holders to rotary hammers mounted opposite each other.Continuous operation results in the formation of the brushes in the collector grooves forming undulations on the surface.Such production can be resolved only on a lathe machined manifold.

To reduce the formation of grooves on the collector, you should try to have the brush holders in a checkerboard pattern.

How to clean the grooves collector punch

But stripping slots between the sections should be carried out as mica, gasket material between the slats, firmer copper slats and less wear.Eventually Micanite pads wear out less, and their height exceeds the height of the copper slats.

To align the notches in height between the slats are milled, or, in simple terms, prodorozhivayutsya.

Milling own hands is best done with a piece of metal saw, sharpened by the collector groove width.

Milling grooves manually

milling grooves manually

parallel to the edge of the groove is applied metal ruler, saw her pressed against the edge and pulled with a weak pressure.The groove is milled to an altitude of copper fins.

milling grooves finishes removing the rest of the material using a hair brush and chamfering using a scraper made of needle files.Grinding is better to make felt.

Any milling should finish grinding and air purge.

The magnitude of production manifold influences and the condition of bearings.Deterioration of the bearings leads to increased collector beats, which in turn leads to accelerated wear of the carbon brushes.To eliminate the beats collector suspicious bearings is recommended to replace with new ones.

How to control the condition of brushes

installing new carbon brushes, recommended necessarily grind them for a better fit to the collector surface.

It is best to adjust the carbon brushes in a homemade lapping.Lapping is a shaft on which the sandpaper is secured.The easiest way to perform a shaft of a tree diameter equal collector machined workpiece on a lathe.Inside the shaft tight metal rod is inserted along the axis.The device is mounted in the chuck of an electric drill is turned on, and brushes are supplied to a rotating emery wheel.

Fit should be carried out carefully, periodically applying a brush to the collector rotor to check them against the light.

priter brush to the collector, before installation it is recommended to check the correct fastening of the brush holder.Brush holders during the factory setting are set to neutral, which minimizes sparking on the collector.If the factory tag is not present, the installation adjustment is performed by shifting the brush holder brush holder in the direction opposite to the rotation of the rotor to a minimum spark formation.

Brushes should not hang out in the brush holder, and tightly pressed against the commutator bars.Pressing force is regulated by springs in the brush holder.

Sparking faulty collector

sparking a failed collector

Increased sparking on the collector of the rotor may occur due to short-circuit the armature, the armature coil breakage, short-circuit winding on the armature body.All these problems can be solved only with the major rotor repair.