Group 2

Jarni, Benedik, Richard

DIY CNC mill

Workflow

Links: Nextcloud:

3D modeling:

• everyone works on thier sub assemblys
• work in private directorys
• upload versions to the shared folder

Design decisions

General

standart PCB sizes:

• metric: 150mm*100mm
• imperial: 127,38mm*102mm (5inch * 4inch)

material goals:

1. PCB milling very precise 0,4mm traces
2. engrave stone soft limestone

work table (fixed)

• 160mm*120mm
• 15mm? height

outer diamensions: (might change based on final design)

• 350mm width
• 300mm depth
• ? height

Machine bed (work table):

• uper bed: (waste board)
  • HDF/MDF
• lower bed: steel or aluminium
  • connect upper bed and lower bed with screws

assembly groups

mechanical

electrical

software

Y-Axis:

X-Axis:

• leadscrew: trapezoidal thread T8
  • two T8 nuts counterd for minimal backlash
  • new stepper + axle coupling
  • prefered: prusa stepper axle assembly
  • bushing for trapezoidal axle

• guiding rods

Frame:

• vertical: 60*30 extrusion
• horizontal: 30*30 extrusion
• additional support by steel wires for structural regidity

idea list:

component list: mechanical structural: - alu extrusion 20*20 moving: - 2x 8mm leadscrews with brass nuts - 4x 8mm guide rails - electrical: mechatronic: manufacturing methods:

• milling parts

Links:

• https://marlinfw.org/

• design decicions: