"""Parallel dowel pin (ISO 8734 style), plain cylinder with chamfered ends.
Its axis is Z, from the origin up."""
from steve import Model

diameter = 4.0  # mm Nominal diameter
length = 16  # mm Length

chamfer = min(0.1 * diameter, 0.25 * length)

model = Model()
with model.sketch("profile", on="XZ", name="Profile") as sk:
    sk.polyline("outline", [(0, 0), (diameter / 2 - chamfer, 0), (diameter / 2, chamfer), (diameter / 2, length - chamfer),
                            (diameter / 2 - chamfer, length), (0, length)])
model.revolve("pin", "profile", axis="Z")
result = model.result()