Does coloring the edges of CD's help the sonics?

Try purple (violet) on the edge next time. Then try to explain why it works....

The blade on the disc trimmer should be positioned such that the entire edge of the disc is timmed at an angle, not just half the edge. What good would it do to trim half the edge, as the light would still be directed out the half that wasn't beveled? The other advantage of beveling the entire edge is that it makes the disc symmetrical, cutting back on wobbling during play.

Another problem with only trimming half the edge is the potential for the polycarbonate to shatter. But primary issue is that it wouldn't be effective.

YRMV...

Cheers

Tbg, please take the time to read the many reviews for the trimmer. You will find that the trimmer is intended to bevel the entire surface of the edge. Reasons for beveling the edge completely include (1) eliminating surface imperfections on the edge, (2) truing up round of the disc and (3) redirecting the scattered laser light, none of which would be accomplished, or completely accomplished, if only half the edge was beveled.

Lastly, can I point out CD cleaners do not perform any of the functions of the disc trimmer, therefore should not be viewed as replacements for the trimmer?

I rest my case. :-)

~ Cheerio

According to web page you provided, "The edge of the beveled disc should be 0.2 mm." Since the edge of an unbeveled discs is around 1 to 1.3 mm, that 0.2 mm thickness is only about 1/5 to 1/6 of the original thickness. Probably best to leave a very slight edge so as not to cut oneself on the edge while handling and help prevent chipping.

So, half is not enough according to manufacurer. Edge should be beveled about 80-85% of the way through

The scattering occurs below the surface and when laser hits the edges of the pits and lands....

Actually, it does, or very nearly. The rotating arm/blade cuts a perfect circle, so the circle formed on the upper surface of the disc by the bevel is perfectly round. Enough mass is removed from the edge during circumcision that the disc should be much more balanced while spinning. You can ignore the little 0.2 mm nub left on the edge.