Refillable Portable Air Can

An empty pressurized can that has been lying around my garage and a handy air pump gave me another idea to make my dusting job a lot easier. 

And.. of course, a valve from discarded bicycle inner tube will definitely complete the project. Ensure to sandpaper, and clean the area to be soldered. Don't forget to remove the inner stem of the inner valve since the stem have some plastic parts. I recommend to using at least 50 watts soldering iron. 

I would stay safe with 60 psi of pressure.

Cut-Off Grinder Exposed

Lately, I've been having a problem with my grinder. It seems that that normal whining sound has been replaced by a low growling with a combination of of a crakling sound sound. I decided to open it and exposed the mechanism.

An old cut-off grinder salvage from flea market retrofitted with a different ac plug.

Other than the regular specs shown of 115v, 1.5 amps.

Inside mechanism exposed. Brushes are still in good shape.

This culprit with the dirty bearing as shown. Commutators seemed smooth and clean.

Most grinders have this so called straight shot wiring, single phase commutator motor. This small capacity series motor can also be operated on dc (direct current) or single phase alternating supply of same voltage with the same characteristics, called universal motors.