import cadquery as cq
w0=cq.Workplane('YZ',origin=(5,0,0))
r=w0.sketch().segment((-100,-84),(-47,-84)).arc((0,-96),(47,-84)).segment((100,-84)).segment((100,84)).segment((47,84)).arc((0,96),(-47,84)).segment((-100,84)).close().assemble().finalize().extrude(-10)