Goldfish have pigment in their skin that reacts to light. When their skin is deprived of light or they have less exposure, this impacts on their skin. Over time, they can lose their colour and turn white. Think of it this way: When people go outside a lot, they get a tan.
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Also aluminium is best drilled with a larger point angle. When drilling plexiglass, the risk of cracks when the drill goes through the mate-rial is reduced with a larger point angle. Centering drills usually have a 90Â° point angle.A drill bit needs to have the right lip clearance angle to cut the material.The clearance angle varies from 7Â° to 14Â°.ount the Drill Bit For small drills, up to approx. 8 mm (5/16 ) you can use the special Tormek Magnifier.Turn the drill holder so the bevelled side points towards the machine.The cutting edges should be parallel to the pin in the Magnifier.