|Project by Stefflus||posted 06-02-2014 01:44 PM||1147 views||1 time favorited||16 comments|
This is the finishing exam for 2014.
I haven’t made anything shareworthy this year, we’ve concentrated on product development and the business side of crafts, but I did make an experimental series of stains with trees as the raw material. This clock is stained with such stain, the light brown is Birch bark stain and the dark red is Rowanberry stain.
The clockwork frame is birch, the wheels are a plywood sandwich with Oak or Ash teeth (the escapement wheel which is visible has Oak teeth, but I found this particular Oak to be too brittle, so I made the rest of the wheels with Ash). The clock case is Aspen. I would have prefered Birch, but it was not available the instant I needed it.
Every internal part is wood, except the bearings which are Moose antler. Also there is some Moose in the escapement pivot bearing. The mechanism is called a “Grasshopper escapement”, invented by John Harrison, and this clock is partly meant to pay homage to him and the 300 year anniversary for the “Longitude Act” laid down in the British Parliament in 1714.
My mockup model had a fully functional grasshopper mechanism, but the final product has given me some trouble. One of the pallets isn’t grabbing properly, so I reconfigured it to work by the “Verge” principle for now. I will replace it when I get the clock back from evaluation. Even with this minor hickup the clock runs and quick tests suggest it keeps reasonable time.
-- -Steffen, from Norway