Technical industrial manufacturing illustration of a ballpoint pen being machined on a conventional milling machine. Scene: - Horizontal knee milling machine (classic manual mill) - Workpiece made of aluminum clamped in a machine vice - Partially machined cylindrical pen body Show: - Step milling process of outer contour (multi-side milling to approximate round shape) - Drilling operation for internal ink refill channel (deep hole drilling) - End milling of conical pen tip - Separate second setup for threading (manual tapping) Include: - Visible cutting tools (end mill, drill bit, tap) - Chip formation (aluminum chips) - Measurement marks on workpiece - Fixture/vice clearly shown - Work coordinate reference Style: - Technical engineering illustration - Semi-realistic CAD + hand-drawn blueprint hybrid - Clean workshop environment - German industrial machining documentation style - Labels: "Schaft", "Spitze", "Innenbohrung", "Fräsen", "Spannen" Lighting: - Neutral workshop lighting - High clarity, instructional diagram feel Color: - Mostly grayscale with subtle metallic aluminum tone High detail, educational manufacturing diagram, precision engineering focus Ver mais