After over twenty years of usage I decide to make restoration of my very first drill machine Narex EC 513. Everything was all right until I replaced front bearing on the armature. The fan, which was very close to the bearing, totaly shattered. So, the drill was postponed as useless.
I realised, I can make one good machine from two broken ones. I decided to use the propeller from Black&Decker
to repair the Narex drill. And I had a good luck - the fan was little bit larger and hole for the spidle
was narrower.
First it was necessary to adjust the rotor. I removed the slot in front of the coils to get the space for new
fan.
With the propeller it was easy. When secured on the lathe the hole was adjusted for the diameter of the armature spindle.
New hole diameter is about 0,2 mm smaller than the spindle diameter. It allow to set the fan on the spindle by press only.
The bearing fitting.
Although the new fan has larger diameter still is possible to close the machine. Both motors are high speed so the new fan will work properly.
After the assembling my excelent Narex drill machine runs great.