Re: Growler??

Posted by Jon H on February 08, 2005 at 17:24:36 from (69.26.17.15):

In Reply to: Growler?? posted by AWB on February 08, 2005 at 15:30:40:

A growler is a big 120 volt AC coil with a V shaped laminated frame with the V open to the top. It is used to check starter and generator armatures for shorted windings. To test an armature you lay it in the V of the growler with the coil energised. The 60 cycle AC will cause a growling noise as the armature vibrates in the V of the growler frame. With the armature contacting the growler frame at the 4 and 8 o clock position and a thin steel strip laid parallel on top of the armature at the 12 o clock position,a shorted armature winding will cause the steel strip to vibrate wildly when held lightly against the armature. You slowly rotate the armature in the growler while loosly holding the strip at the 12 o clock position. If you find a spot that causes vibration of the steel strip,then either the insulation on that winding is defective or brush dust has shorted the commutator bars together. Clean the spaces between the commutator bars and test again.
Most growlers also have a built in test light with prods that when connected to the armature shaft and individual commutator bars will light the light if any windings have bad insulation and are shorted to ground. I asked my friend at the local salvage yard if a useable growler ever came in with the grage scrap,he walked me back to a shelf and gave me my choice of 4.
One note of caution is most older growlers have the test light wired directly to the 120V power supply,so touching the metal end of one or both of the test prods can give you a deadly shock. Even if you touch only the one prod connected to the hot side of the line and a good ground it will hit you with 120V.

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