Vernier clock

Stationary disk with 60 slots, with a rotating disk with delta 1 lines behind.

On a caliper, the vernier site of the scale has 11 increments for 10 on the main side.

Does it matter which side becomes the hand and which the background? Test...

to do

• better prototyping. maybe extension
  • no easy documentation on cloning in scripting

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Actioned 2021-10-31

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• Cargo

• cut it out
• need a flat, thin material. Darrel suggested an LP - that would not laser, but maybe 1/16" routing would be OK

work flow

• select shape
• set rotational center appropriately

run macro-ish:

• create tiled clones
  • make as many rows as blips needed (x)
  • shift y -100% per row
  • rotate 360/x per row
• take one clone drag it elsewhere
• clone that one as
  • x-1 rows
• shift y -100%/row
  • roteate 360/(x-1)
• disconnect clones
• the x-copy becomes the top:
  • make cuttable: red outline only
  • put indicator for hour hand
  • group
• the x-1 copy becomes the background
  • make black, no outline
  • group
• align the two on top of each other (left and top)

manually rotate to test

minute-off-hour phase

disk:

• 13 divs
• 360/13 = 27.692
• 360/26 = 13.846

backgr:

• 12 divs
• 360/12 = 30
• 360/24 = 15

file

\ projects\vernier clock

options if current design does not work

• need to figure out the hours part... maybe spiral?
• could do the whole thing with only 5 minute increments and use hour speed

givens

• Clock mechanism
  • diameter hour 5.75mm or 5mm (it has a step)
  • diameter minute 3.55mm