"""Deep groove ball bearing, shielded (2Z), ISO 15 boundary dimensions. Envelope: inner and outer rings joined by
recessed shields (one solid), centred on the origin with its axis along Z."""
from steve import Model

designation = "608"  # Bearing designation

# designation: (bore d, outside diameter D, width B)
BEARINGS = {
    '623': (3, 10, 4),
    '624': (4, 13, 5),
    '625': (5, 16, 5),
    '626': (6, 19, 6),
    '608': (8, 22, 7),
    '688': (8, 16, 5),
    '6000': (10, 26, 8),
    '6001': (12, 28, 8),
    '6002': (15, 32, 9),
    '6003': (17, 35, 10),
    '6004': (20, 42, 12),
    '6200': (10, 30, 9),
    '6201': (12, 32, 10),
    '6202': (15, 35, 11),
    '6203': (17, 40, 12),
    '6204': (20, 47, 14),
}
d, D, B = BEARINGS[designation]
ring = (D - d) * 0.22   # radial thickness of each ring's face
recess = min(0.4, B * 0.06)

model = Model()
with model.sketch("rings", on="XY", name="Rings") as sk:
    sk.circle("outer", (0, 0), D / 2)
    sk.circle("bore", (0, 0), d / 2)
model.extrude("body", "rings", distance=B, both=True)  # both: B in all, centred on XY
model.plane("face_top", on="XY", offset=B / 2, name="Top face")
with model.sketch("shield_top", on="face_top", name="Top shield") as sk:
    sk.circle("out", (0, 0), D / 2 - ring)
    sk.circle("inn", (0, 0), d / 2 + ring)
model.extrude("recess_top", "shield_top", distance=-recess, op="cut")
model.plane("face_bottom", on="XY", offset=-B / 2, name="Bottom face")
with model.sketch("shield_bottom", on="face_bottom", name="Bottom shield") as sk:
    sk.circle("out", (0, 0), D / 2 - ring)
    sk.circle("inn", (0, 0), d / 2 + ring)
model.extrude("recess_bottom", "shield_bottom", distance=recess, op="cut")
result = model.result()