Archive:Tiefpunkts-CNC-Mill

   

CNC Mill Release status: experimental [box doku]
Description
Author(s)	tiefpunkt (Tiefpunkt)
Last Version	v0.1

Severin brought his CNC mill to the lab a while back. It's beginnings can be found here: CNC-Fräse

Build Log

Date	Activities
2015-04-24	Screwed down the main table
2015-04-26	Rebuild Y axis motor plate in OpenSCAD, and lasercut it.
2015-04-30	Printed new guides for the Y axis belt [1] -> A little to big. Screwed new Y axis motor plate into place. Belt a little too loose. Need to place pulleys a little higher.
2015-05-03	Printed parts to hold 2 endstops on the Y axis. Endstops are in place now, but not yet connected.
2015-06-14	Connected endstops to Arduino controller Updated grbl on Arduino to 0.8c (custom compiled, to accommodate for different pin configurations, and homing only on X and Y [2]) Testdrives Problems: Noise on the endstops, triggered e.g. when starting the spindle -> maybe bigger pullups? Right X endstop cannot be triggered, due to size of the z-axis sled

Issues

• Electrical noise
  • http://www.cnccookbook.com/CCCNCNoise.html
  • http://www.shapeoko.com/forum/viewtopic.php?f=5&t=1268&p=19246#p19246
  • https://github.com/grbl/grbl/issues/163
  • http://electronics.stackexchange.com/questions/51558/false-positives-on-arduino-input
  • http://forum.arduino.cc/index.php?topic=62065.0

Workflow

• Generating G-Code:
  • F-Engrave - DXF to GCode, single pass only
  • gcodetools for Inkscape (not tested yet)
  • dxf2gcode (not tested yet)
  • image2gcode online, not tested yet

• Executing on the machine:
  • Universal G-Code Sender - Java, requires rxtx library, on OS X follow [3] to install
  • grblgui not tested

References

• G-Code
  • Wikipedia
  • RegRap includes information on what commands are supported by grbl. Also has shorter Cheat Sheet