Tabletop CNC Lathe
Design of a 2-axis tabletop CNC lathe suitable for educational purposes and small prototyping applications, in a group of 5.
Constraints
Should have enough power to machine materials such as aluminium alloys and polymers
Should be able to accommodate cylindrical bar up to 40mm in diameter and 60mm in length (of which 20mm is used for clamping the component in the chuck)
Specified maximum deflection at cutting edge, cutting velocity, depth of cut and feed rate
Size of 625x250mm maximum
Design Process
All calculations were made on shared Excel sheets
Calculation of cutting forces and total deflection at cutting edge to select suitable hollow spindle inner and outer diameters
Deep-groove and angular ball bearing selection from NSK catalogue as well as selection of X and Z-axis translation tables rails and carriages
Calculation of axial loads about to tables to select suitable lead screw, mounted ball bearings and nuts
Selection of both spindle and table motors from the Maxon catalogue using a speed-torque diagram and after choosing an appropriate speed ratio of 3
Pulley, belt and key selection using an estimated inter-shaft distance and chosen coefficients
Spindle housing and drive train cross-sectional view
X-axis tables cross-sectional views
Z-axis tables cross-sectional views
Individual CAD drawings
