here is a neat tip..................perhaps skally could make a tut for it.
This is what I do with the label hole!
Because the center hole is probably the most important part of any disc in terms of it's stable operation under field conditions, I make a PSD HOLE file for each label i produce and then save it as a png file.
Normally, i make two just in case of accidents etc.
I then print these out on matte adhesive backed (plain white) paper which means I can peel them straight off when needed.
Once the hole has been peeled away from the adhesive (great care is required when performing this task as a hole can be easily damaged by over zealous peeling) then it can be carefully centered onto your media.
Neat trick (IMG:style_emoticons/default/winking.gif
) and after a little practice you will become as good as me at it.
CENTER HOLE BURRS are axial extensions that protrude beyond the substrate surface. They are not allowed on the CD entrance surface, or both surfaces of DVD discs, and standards require a prescribed chamfer or radius of the center hole edge. Center hole burrs can interfere with proper mounting of the disc onto the drive spindle, and are usually caused by improper molding or subsequent handling of the ejected substrate before it cools.
RADIAL RUN OUT: Precise disc centering is assured by a highly accurate, custom spindle. This allows both track eccentricity and outer rim concentricity, or radial runout, to be measured to an accuracy of 0.01 mm using a specially mounted, laboratory grade microscope. Magnification enables any burrs on the outer rim to be quantified.
Eccentricity evaluates azimuthal variation of the track radius, and provides important assurance that changes in track location remain within the dynamic range of the track servomechanism. High frequency variations of radial track position are evaluated by radial noise tests, while sudden, low frequency variations can be measured by radial acceleration tests. High eccentricity can be generated during stamper punching, molding, and subsequent handling of the ejected substrate before it cools.
Concentricity measures radial runout of the outer rim relative to the geometric center of the disc as determined by the center hole, and contributes to disc unbalance. Excessive values are usually caused during molding or subsequent handling of the ejected substrate before it cools.
HAVE FUN, MAKE HOLES (IMG:style_emoticons/default/cheers.gif