Opening up a motor


I recently had to open up a motor to clean up the commutator. I didn’t have a real gear puller so I put one together with the following parts I had lying around:

  • Some perforated steel strapping
  • a long 3/8″ threaded rod with nuts
  • two 1/2 pipe flanges
  • four small bolts with nuts and washers.
  • Four larger bolts with modified wingnuts.

The photo pretty much show how I did it. I used the strapping to make “legs” which were attached to the end of the motor that I had to pull off using the longer bolts and wingnuts with one wing cut off. I did this so I could tighten the bolts without having to hold the nuts with a wrench.

The other end of the straps are bolted to a pipe flange. The threaded rod goes through the flange and then through another one so that the nut is easy to reach with a wrench. (The wire wire ties, by the way, are holding the spring-loaded brushes out of the way.)

The end of the threaded rod is bearing on the end of the motor shaft.

A few turns of the lower nut, holding the threaded rod with pliers and the end of the motor came right off.

An ad-hoc socket extension

Faced with having to turn a 1/4″ socket without an extension for the ratchet handle I improvised. It turns out that a tap has a 1/4″ square drive end. So that, plus a pair of Vise-Grips allowed me to get the job done.

Be sharp!’ screwdriver.

In order to work well without slipping or stripping the head of a slotted screw, the screwdriver blade should be sharp. Not like a knife, but not rounded. Here are some pictures of good screwdriver blades and bad:

Showing a nice sharp screwdriver tip.
A nice sharp screwdriver tip.

Showing a dull screwdriverA  dull  screwdriver  tip
Show a screwdriver which is too small for the screw.This screwdriver is too small
Showing a screwdriver which fits the screw head well.This screwdriver is just right.