[DICKEYBIRD]

I was reading the post on here about eBay TM motors and thought maybe someone could use the method I came up with to cool them. I removed the flywheel/fan from mine and immediately found that airflow is needed.

I made a wood plug that duplicated the shape of the fan housing and the motor O.D. I turned the round end in the lathe, shaped the transition from round to square with the mill, a plane and coarse sandpaper. I then glued on a pair of blocks to make bumps to clear the brush boxes and then shrunk a 2 liter soda bottle tightly around it. I slit it down one side to remove it from the plug and then installed it with a tyrap, a piece of aluminum 200 mph tape and a strip of filament tape.

The soda bottle (P.E.T. plastic, polyethylene terephthalate) shrinks about 25-30% at approx. 400 deg f. and is amazingly tough stuff after shrinking.

The 1st fan I tried was from an old PC power supply but it didn't flow enough air so I bought a 12v 80 mm sq., 80 cfm server fan off eBay for $9.00. It does a great job but is a tad noisy. The fan is mounted to one of the motor studs via a cobbled up aluminum bracket. I mounted it so that it draws air from t'other end and blows the ozone rich air away from the motor guts. The insulation ought'a last longer that way.

I added a small switch and chose to turn it on & off manually so I can leave it running a few minutes after use to cool the motor all the way down.

Hope this helps someone. :cheers:

edit: Sorry, I just noticed the last pic shows the 1st fan and that it's set to blow air the wrong way. That was before someone on another forum mentioned the ozone thing.