What is a vidra saw?

Answer 1

I have never heard of a "Vidra" saw, nor can I find anything on such a saw, I found a "Vibra" lapping tool, to which I will post an explanation to, if this is not what your looking for, Please check the spelling and re-submit another post with as much information as you can. (excerpt from vibra lap machine):

Vibra-lapping: To polish a flat surface, like a book end or geode, you use a saw to cut your flat surface, then a grinder to remove any burrs left by the saw, and then a vibra-lap to polish. A vibra-lap is a round pan that vibrates. You place grit and water in the flat pan and then place your rock in on the grit. It vibrates and grinds down the surface. When vibralapping, you complete the process in 3 stages--coarse, fine, and polish. Each stage takes 6-8 hours. You fill the pan 2/3rds full of rock, so if you are polishing geodes, usually you can do 3-4 sets at a time.

* http://www.rocks4u.com/gettingstarted.htm