Spirals with the router

Channel: Matthias Wandel

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This in response to Izzy Swan's latest video where he made a wonderfully complicated contraption for routing spirals, using gears and threaded rod.
Izzy swan's video: http://youtu.be/ouI3HRsomn4
Granted, you may have to build a pantograph, but the pantograph is easier to build than Izzy's jig: http://youtu.be/vtm4u583YOQ
More about the pantograph: http://woodgears.ca/pantograph