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Removing CAD ridges from tiny hard to reach areas


#1

I have a mounting that is CAD/CAM. I am trying to remove the ridges
from the casting in the areas for tiny melee setting areas, but I
can’t figure out what to use. There are some setting areas without
azures, so compound loaded strings are not an option and pencil
polishing sticks are too large. There is milgrain adjacent to these
areas, making it all the more challenging. Any suggestions
appreciated!

Thank you,

Donna W
Huntsville, AL


#2
I have a mounting that is CAD/CAM. I am trying to remove the
ridges from the casting in the areas for tiny melee setting areas,
but I can't figure out what to use. 

A couple of options come to mind, since I’ve dealt with this problem
myself. First off, it’s a lot easier to clean up a wax model than it
is a metal casting. Too late for that. So, the next thing is this.

  1. If you have any skill with gravers, you can brighten up the areas
    by engraving the details back to a smooth, shiny surface.

  2. Use “Robinson brushes” and bobbing compound. These are rotary
    brushes you use in a flex shaft hand piece. They can be bough in
    three grades, hard, medium, and soft. I prefer medium. They act as
    tiny buffing wheels, except that the bristles can get down in
    recesses and roll over the high areas taking off a minimum of
    material where you want to keep it. Bobbing compound is about as
    course as Tripoli, but it’s a little stickier so it hangs on the
    brushes longer. You have to keep re-loading the brushes as the
    compound only stays on for a very short time.

David L. Huffman