Anyone here know what a damper gear or rotary gear is?

Reply Sun 22 Mar, 2009 10:38 pm
I'm designing a flip-down door on a high end video/audio system and someone told me I needed this rotary damper or gear damper to slow the opening and closing of the door. I looked at the cassete tape decks, DVD players, CD-ROM and notice gears are making this happen.

My knowledge of gears can fit into a thimble. I have no idea how to set the gear ratio, what number of gear teeth I need, if the mating rotary gear has 11 teeth, what diameter size gear I need, etc.

Anyone here an engineer or studying to be one? Can you guys give me some useful pointers?
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Reply Sun 22 Mar, 2009 11:12 pm
Two gears of different diameters that have meshing teeth e.g. spur gears can allow one to change the rpm by meshing the input gear with an output gear of a different diameter. Input gear with 12 teeth and and output gear of 24 teeth would result in slowing the rpm by half.
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