Monarch (Dean, Smith & Grace) CNC250 and CNC305 Lathe. Detailed Maintenance Manual with Phillips 3482/PC20 PCI Ladder charts, Parts Manual as Engineering Drawings and Electrical Diagrams. The Parts drawings were issued on a blue paper, have been scanned at very high resolution, carefully adjusted and are best when viewed on screen where the details are much clearer. This manual, is, therefore, supplied on a pen drive or as a full-resolution download..