Step 1: What You Need
2. Pointed cone cutting tip (show below)
3. A hard surface to cut your disks on (like a tray)
4. Some practice disks
5. The real disks
6. A filtering mask (if you are ultra careful you won't want to breath in any plastic/aluminium dust from the disks)
7. A stencil (for the desired shape) and a marker
8. A steady arm/hand
Step 2: Some Information
A compact disc is made from a 1.2 mm thick disc of almost pure polycarbonateplastic and weighs approximately 16 grams. A thin layer of aluminium (or, morerarely, gold, used for its longevity, such as in some limited-edition audiophile CDs) is applied to the surface to make it reflective, and is protected by a filmof lacquer. The lacquer is normally printed directly and not with an adhesivelabel. Common printing methods for compact discs are screen-printing and offset printing.
Hence we know CD's are made from plastic and a thin Aluminum layer. This means we can cut and shape disks by using a suitable cutter with a high enough RPM (revolutions per minute)
Disc shapes and diametersA Mini-CD is 8 centimeters in diameter.A Mini-CD is 8 centimeters in diameter.The digital data on a CD begins at the center of the disc and proceeds outwardsto the edge, which allows adaptation to the different size formats available. Standard CDs are available in two sizes. By far the most common is 120 mm in diameter, with a 74 or 80-minute audio capacity and a 650 or 700 MB data capacity. 80 mm discs ("Mini CDs") were originally designed for CD singles and can hold up to 21 minutes of music or 184 MB of data but never really became popular. Today nearly all singles are released on 120 mm CDs, which is calleda Maxi single.
Hence, we can cut away the outer parts of disks which have no data written to them (provided we have not used the entire disk space)
An easy way to make sure you cut safely is to look at the shiny side of the disk and see how much of the area is darker or shaded. This shows the area of the disk onto which data has been written. The rest of the disk can be cut away.
Step 3: Preparation
You need to find the right shape to cut a disk. Disks are best cut into shapes which have rotational symmetry. These will also play better in some drives, as they will not make any excess vibrations. In the video, I cut 2 cds, one into a heart shape and another into an 8cm disk. The heart shape will not fit into a conventional PC CD-ROM drive, but the 8cm disk would. The images below give you some indication of what is required, but you can (and should) experiment with other shapes.
Also, keep in mind that the more you cut away, the less data you can store on the disk. I also recommend you first write data to your disks BEFORE cutting/shaping them.
Step 4: Cutting Technique
Step 5: Cutting 12cm Disks Into 8cm Disks
1. Use a suitable stencil for your 8cm disks. I used a coffee/tea mug.
2. Position the stencil in the center by marking the disk 2cm in (shown in video)
3. Using a marker, draw around the stencil
4. Cut from the outside of the disk in, making sure you don't touch your marking.
5. Once you've cut the basic shape, use another tip for your cutter to smooth it off.
Please practice with some old ones first. Once you get the hang of it, its actually quite easy.