"""Plain washer, inch series, Type A preferred sizes of ASME B18.21.1-2009 (formerly B18.22.1-1965; narrow N and wide W
series), for #0 to 1/2 in screws; and fender washers (F) for #0 to 1/2 in screws as step.parts' published models draw
them (no standard covers fender washers).

Envelope model: a flat ring (inside diameter ID, outside diameter OD, thickness T, nominal values). It sits on the
XY plane, centred on the origin, axis along +Z. The model is in millimetres (1 in = 25.4 mm).
"""
from steve import Model

size = "1/4 N"  # Washer size (screw size, series)
material = "steel"  # Material

# Inches. Type A plain washers, preferred sizes: size: (inside diameter ID, outside diameter OD, thickness T), basic
# values. ASME B18.21.1-2009 (R2016), which took over B18.22.1-1965 unchanged, as reproduced at
# https://amesweb.info/Fasteners/Washers/Type-A-Plain-Washers-Dimensions-Chart.aspx (sizes No. 0, 2, 4 named there);
# same values in B18.22.1-1965 (R1998) at https://engineersedge.com/plain_washers.htm and
# https://www.globalfastener.com/standards/detail_1111.html (Table 1A).
WASHERS = {
    "#0": (0.078, 0.188, 0.020),
    "#2": (0.094, 0.250, 0.020),
    "#4": (0.125, 0.312, 0.032),
    "#6": (0.156, 0.375, 0.049),
    "#8": (0.188, 0.438, 0.049),
    "#10": (0.219, 0.500, 0.049),
    "1/4 N": (0.281, 0.625, 0.065),
    "1/4 W": (0.312, 0.734, 0.065),
    "5/16 N": (0.344, 0.688, 0.065),
    "5/16 W": (0.375, 0.875, 0.083),
    "3/8 N": (0.406, 0.812, 0.065),
    "3/8 W": (0.438, 1.000, 0.083),
    "7/16 N": (0.469, 0.922, 0.065),
    "7/16 W": (0.500, 1.250, 0.083),
    "1/2 N": (0.531, 1.062, 0.095),
    "1/2 W": (0.562, 1.375, 0.109),
}
# Fender washers (F), mm: measured on step.parts' models asme_fender_washer_<size>_simple (MIT; their bore and outside
# cylinder radii and their thickness, read from the faces). No standard covers fender washers; these models are
# proportional (OD 3.2 d, ID 1.08 d, T 0.18 d with d the screw's nominal diameter, T at least 0.45 mm).
# size: (inside diameter ID, outside diameter OD, thickness T)
FENDER = {
    "#0 F": (1.646, 4.8768, 0.45),
    "#2 F": (2.3592, 6.9901, 0.45),
    "#4 F": (3.0724, 9.1034, 0.5121),
    "#6 F": (3.7856, 11.2166, 0.6309),
    "#8 F": (4.4988, 13.3299, 0.7498),
    "#10 F": (5.212, 15.4432, 0.8687),
    "1/4 F": (6.858, 20.32, 1.143),
    "5/16 F": (8.5724, 25.4, 1.4287),
    "3/8 F": (10.287, 30.48, 1.7145),
    "1/2 F": (13.716, 40.64, 2.286),
}
# material choice: (STEVE material library id, appearance colour)
MATERIALS = {
    "steel": ("steel-generic", "#b8bcc2"),        # carbon steel, zinc plated
    "stainless-18-8": ("stainless-304", "#c9ccd0"),
    "stainless-316": ("stainless-316", "#c9ccd0"),
}
INCH = 25.4

ID, OD, T = FENDER[size] if size in FENDER else (v * INCH for v in WASHERS[size])
material_id, colour = MATERIALS[material]

model = Model()
with model.sketch("washer_sketch", on="XY", name="Washer") as sk:
    sk.circle("outside", (0, 0), OD / 2)
    sk.circle("inside", (0, 0), ID / 2)
model.extrude("washer", "washer_sketch", distance=T, name="Washer")
model.material(material_id, color=colour)
result = model.result()