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A Jitterbug sander is a vibration sander.  The sanding pad moves back   an forth. This usually refers to an air driven vibration sander.
An Orbital sander moves it's sanding disc in an orbit or circle.
A Random Orbital sander moves it's sanding disc in a random pattern.    This prevents swirls on the surface.
A Belt Sander move it's sanding belt in a straight line on the surface.

The following link has a picture of a Jitterbug sander.  I am using a random orbital sander on my Polyfiber primer and Superfil filler.

http://www.grizzlyindustrial.com/fcgi-bin/lookup.fcgi/products/lookup.cfg?q=
item&kw=H0594


Ranny Fullinwider
Equiva Trading Company
(713) 277-5234

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.