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colored acrylic

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ChadTower:

It's vibration that causes the cracks.  I always have best success when I sandwich the acrylic between two pieces of wood and drill/cut that way.  Almost entirely prevents the acrylic from vibrating when the bit is doing its work.

selfie:
Acrylic is a very hard and very brittle material. When you drill wood and metal the swarf bends as the spiral of the drill bit cuts it away from the panel. The acrylic swarf will not bend when it is cut so the drill bit digs in and then breaks away the material from the panel causing the cracking, this is why a slow drill speed doesn't always prevent cracking. Blunt drill bit "work" as they heat the material, through friction, as the blunt edge slowly cuts.
By scraping, rather than cutting the swarf is disconnected from the panel as it is removed.

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