Installing the rotor into the chuck

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While rotating the rotor, try to center it in the drill chuck.

How to center a drill rotor before grinding
The rotor is centered in the drill chuck to ensure minimal runout of the radial surface of the collector relative to the rotor shaft.

First, check the runout of the chuck jaws. Secure the drill in a vice, install the largest diameter drill bit in the chuck.

While rotating the drill, bring a pencil to the rotating side surface of the drill, resting it on a simple stop. With minimal beating, the pencil will outline a solid line on the surface of the drill.If the runout is significant, change the chuck in the drill or select a drill with a smaller chuck runout.

Now, instead of a drill, clamp the rotor shaft and use the same method to determine the locations of the rotor or collector runout.

The process of grinding the collector
The collector grinding process should begin with the selection of sanding material. It is recommended to use sandpaper or a file for collector grinding.

Choose sandpaper of several numbers, starting from 100 and higher.

Now start sanding. Apply a wooden block with sandpaper hong kong telegram data attached to the collector, rotate the drill and, without pressing the block too hard against the collector surface, sand.

Grinding the collector in a drill
The grinding operation is recommended to be used on rotors that have already been in operation and have minor collector wear.

Correct sparking of brushes
If you have replaced the collector on the Makita 2470 rotary hammer, then after it is mounted on the shaft, the collector must be ground. This operation is performed to eliminate the radial runout of the surface of the lamellas of the new collector relative to the anchor shaft.

It is best to turn the collector on a lathe using mandrels. But this operation can also be done at home. However, you cannot do it without an additional device. The video will help you understand how to turn the collector.