Initial import

dimensions.py

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+import math
+
+import components.audio_plug as audio_plug
+import components.usb_hub as usb_hub
+import components.keyboard as keyboard
+import components.screen_pillars as screen_pillars
+
+## Standard things (TODO move to separate file)
+
+# M3 threaded insert sizes
+ti_radius = 2.35
+ti_depth = 6.25
+
+# M3 hex nut dimensions
+m3_hn_diam = 5.5
+m3_hn_hole = 3
+m3_hn_thickness = 2.5
+
+# Dimensions for countersunk M4 screws
+m4_top = 9
+m4_bottom = 4
+
+## Keyboard dimensions
+keyboard.kbd_height = 95.5
+keyboard.kbd_width = 305
+keyboard.kbd_back_thickness = 19
+keyboard.kbd_front_thickness = 12
+# Pythagoras
+keyboard.kbd_actual_height = (
+    keyboard.kbd_height**2
+    - (keyboard.kbd_back_thickness - keyboard.kbd_front_thickness) ** 2
+) ** 0.5
+keyboard.kbd_angle = (
+    math.acos(keyboard.kbd_actual_height / keyboard.kbd_height) * 180 / math.pi
+)
+keyboard.kbd_pillar_positions = [
+    (19, 16),
+    (142.5, 25.5),
+    (keyboard.kbd_width - 20, 16),
+    (23.5, 79.5),
+    (145.5, 82.5),
+    (keyboard.kbd_width - 19, 79.5),
+]
+keyboard.kbd_pillar_offset_1 = 5.5
+keyboard.kbd_pillar_radius_1 = 5
+keyboard.kbd_pillar_offset_2 = 2.5
+keyboard.kbd_pillar_radius_2 = 2.4
+keyboard.kbd_screw_radius = 1.1
+keyboard.init()
+
+## Screen dimensions
+# Whole screen size
+scr_w = 231
+scr_h = 65
+scr_thickness = 5.5
+# Visible screen size
+vis_w = 219
+vis_h = 55
+
+
+## Dimensions for the base of the computer
+
+# Thickness of the outer material
+shell_t = 3
+
+# Size of the base
+width = keyboard.kbd_width + 2 * shell_t
+height = 159
+base_thickness = 30 + shell_t  # 30 inside
+
+
+# These are placed where convenient, and are used to join the top and bottom
+# parts of the case.
+# Measured from back-left corner OUTSIDE
+mounting_pillar_positions = [
+    (6, 6),
+    (6, 43),
+    (120, 6),
+    (170, 6),
+    (width - 6, 6),
+    (width - 6, 43),
+    (120, 48),
+    (170, 48),
+]
+
+# Offset for the USB port from back-left corner
+# of the case to left side of the hub
+usb_offset_x = width - audio_plug.item_w - usb_hub.item_w
+
+# CPU holder position from back-left corner of the case
+cpu_offset_x = 177
+cpu_offset_y = 2
+
+# Battery holder position from back-left corner of the case
+battery_offset_x = 15
+battery_offset_y = 3
+
+# HDMI out hole from back-left corner of the case
+hdmi_out_offset_x = 138
+
+## Dimensions for the Tandy lid
+
+# Size of the whole object
+tl_height = 66
+tl_height_bottom = 59
+tl_full_thickness = 48  # Will be shorter after construction
+# Screen angle
+tl_scr_angle = 20
+
+
+## Dimensions for the hinged lid
+
+# This is a constant used to control how far back the hinges go
+# when open. It's arbitrary and can be adjusted experimentally
+# printing small samples
+hl_hinge_slant = shell_t + 2
+
+hl_bezel_width = m3_hn_diam + 2
+hl_bezel_height = 1
+hl_bezel_thickness = 2
+
+hl_hinge_radius = 5.5
+hl_screw_radius = 1.5  # M3
+hl_ring_radius = 5  # M3
+hl_hinge_offset = max(p[1] for p in mounting_pillar_positions) + 6
+hl_hinge_width = 25
+# Base + this lid
+hl_full_thickness = 43
+
+
+## Dimensions for the simple lid
+sl_lip_thickness = 1.5
+sl_height = (
+    max([y for _, y in mounting_pillar_positions]) + 6 + shell_t + sl_lip_thickness
+)
+sl_thickness = shell_t
+sl_front_lip = 8
+
+## Dimensions for pillars that connect base and lids
+screen_pillars.pillar_width = 12
+screen_pillars.pillar_height = 12
+screen_pillars.screw_head_radius = 3
+screen_pillars.screw_radius = 1.8
+screen_pillars.screw_head_depth = base_thickness - 13  # (screw thread length - threaded insert depth)