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Guy
Marsden
Artwork
Engineering
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I have worked with Therese Lahaie since the mid 1990's. All her work has mechanisms that move glass, plastics, or light to create slow meditative movements. In these sculptures the light a moves slowly towards and away from the glass casting shadows on the wall that expand and contract rhythmically like the breath. For "Column" she asked me to engineer a mechanism that would move a light back and forth about 14". |
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| Here's a view of the inside of the mechanism. The aluminum base plate slides into the box and the wood board shown above screws on to the side to cover everything. The box is painted white on the outside to match the gallery ceiling. The view below shows the mechanism as it would be on the ceiling with the side removed. | |
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| The low rpm motor, is quite quiet but in order to further dampen any sound that might be transmitted to the moving carriage I mounted it on rubber shock absorbers and used a rubber timing belt which also reduces the motor speed to the chain drive so that the right travel rate is achieved. | |
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| I don't do a lot of mechanical work, but I recently acquired a small milling machine that allowed me to create the chain and belt sprocket supports. These fixtures can be adjusted to tension both the chain and the drive belts separately. | |
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I fabricated the carriage from UHMW (ultra high molecular weight)
plastic. This material self lubricates on the steel rails and slides
smooth and quiet. The industrial light fixture is wired to a flexible
cable that follows the carriage as it moves. The movie below allows you to see the details of the mechanism in motion. |
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contact Therese LaHaie at:
therese@thereselahaie.com
or visit her web site:
http://thereselahaie.com/
