First making the seat top 400mm by 400mm. Then made the column half the size of my model (200mm diameter) with the thinner part of the column measuring 420mm. Working out the thickness of each layer so that the total hight is ergonomically correct at 450mm
Next I added in the five reduced sized cogs measuring 100mm diameter circle, so with two cogs totally 200mm with the column at 200mm the mechanism should actually sit directly underneath the 4000mm diameter square seat
Next I
added in the base/crochet design that worked well in my original wooden model. It is crucial that the height at which the cogs are suspended and the distance from the column is spot on and identical for all five cogs because if one is off it could jam, flawing the mechanism. Already I can see an improvement in the aesthetics, the proportions, angles and components sit really well together as much more refined piece
Next using the Arc tool in SketchUp I could easily show a rough idea of the five arms that are attached to the five cogs, that curve around the edges of the seat and up to surround the neck of the victim
I really like how my chair trap is looking as is becoming more than just a simply mechanism
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