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Increase mounting holes, add courtyards around mounting holes, move conflicting resistors #132

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merged 3 commits into from Apr 22, 2019

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electroniceel
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Was part of the discussion for #130.

Also increase the size of the mounting holes:

  • 3.2mm is the standard mounting hole size for M3 screws. But this requires tight
    tolerances that sometimes are difficult to achieve with hobbyist tools. 3.5mm
    allows for more tolerance

  • a M3 washer has 7mm outer diameter. A 3mm screw+washer can be offset 0.5mm in a
    3.5mm hole -> 8mm space necessary around the center of the hole. Add 1mm
    clearance + tolerance around gives a 10mm diameter courtyard keepout zone

  • change to a pad style with small vias in it because the vias slightly increase
    the adhesion of the copper to the FR4 material. I think it also looks nice.

Move R5 and R6 out of the way:

resistors

Do not change the lvds connector, even if it conflicts with the courtyard as per discussion on IRC.

… space around

- 3.2mm is the standard mounting hole size for M3 screws. But this requires tight
  tolerances that sometimes are difficult to achieve with hobbyist tools. 3.5mm
  allows for more tolerance

- a M3 washer has 7mm outer diameter. A 3mm screw+washer can be offset 0.5mm in a
  3.5mm hole -> 8mm space necessary around the center of the hole. Add 1mm
  clearance + tolerance around gives a 10mm diameter courtyard keepout zone

- change to a pad style with small vias in it because the vias slightly increase
  the adhesion of the copper to the FR4 material. I think it also looks nice.
@whitequark whitequark merged commit 95e1c26 into GlasgowEmbedded:master Apr 22, 2019
@electroniceel electroniceel deleted the mounting-holes branch April 22, 2019 11:33
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2 participants