grbl_mill

• fully printable
  • large parts are printed with a 0.8 mm nozzle
  • smaller parts with a 0.4 mm nozzle
• completly designed with openSCAD
• derived from http://www.thingiverse.com/thing:44854
• you need the MCAD library https://github.com/SolidCode/MCAD

Usage

• open grbl_mill_main.scad in openSCAD to view the assembled mill
  • you can select the viewed part in the main file by commenting out the appropriate line
• in grbl_mill_const.scad you can adjust the main construction
  • in the division Configuration you can configure the width (count) of profiles for each direction separatly
  • there are some more flags to configuring the mill
• some tuning is done directly in grbl_mill_parts.scad
• all things are downloadable

Working Area

• xy: 107.5 mm x 84.3 mm
• z = about 40 - 50 mm, depending from tool and using the t-nut profiles
• is enough for milling pcbs or hobbed bolts

Profiles

• using alu profiles from http://www.kinetikmsystem.de
• K30 for the basic construction
  • you can use for all directions a width of 3 basic profiles (like in the original design)
  • but i had some sourcing restrictions so i am used on y 4 basic profile width and for the other two profiles
  • length for z: 200 mm (movable) and 300 mm (fix)
  • length for x and y: 260 mm
• K20 for the t-nut plate
  • length is the same like for x: 260 mm

Screws and Rods

• to connect the end parts to the profiles i have used M6 self cutting screws
• to fix the slider and the TR8 nut i used M3 screws

• fixing the t-nut profíles use M4 screws

• the T8 threaded rod and the TR8 nut i have sourced from http://www.metallbau-pietrzak.de (ebay)
• the trapezoid rods are 300 mm (x), 250 mm (y) and 200 m (z) long
• the motor coupler on all axes is from http://www.thingiverse.com/thing:173335

CNC-Control-Unit and Spindle

• Arduino Uno with Grbl V0.9j https://github.com/grbl/grbl
• GrblShield with DRV8825 driver chips
• the spindle is from ebay (China) with a Driver Board, that can be connected to the Grbl-Board