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hervema Thanks a lot to share your settings about grbl in cpu_map.h !! this allow to work perfectly with grbl >= 0.9, you avoid many hours of research. Thanks again ! Best Regards.

rarisoft 04/01/2018
The assembly of the machine was relatively easy. But I also consider IKEA furiture easy to build :-). I havent used the T-nuts provided in the package but used bigger ones instead, see https://www.banggood.com/50pcs-M5-T-Sliding-Nut-Zin-Plated-Carbon-Steel-T-Sliding-Nut-for-2020-Aluminum-Profile-p-1048439.html The Z-axix comes out of a 3D-printer, which is surprisingly sturdy. However, the little spax are very brittle, I turned the head of two of them, the holes seem to be too tight so the thread scuffs the screw. This means, I need a new part. Be careful not to over tighten the screws. I also will alter this design later to allow easy tool changes, i.g. from a spindle to a laser head or pen for plotting. The controller is preflashed with grbl 0.8c and works with the grblController software provided. In case you want to upgrade the grbl software running in the Arduino Nano, the following settings need to be altered to accommodate the different layout of this special CNC shield. I found the following works correctly for CPU_MAP_ATMEGA328P. This setting is working for the CNC shield of the CNC2417 see config.h for grbl version <= 0.8 see cpu_map.h for grbl version >= 1.1 (0.9 I haven't checked :-) ) #define X_STEP_BIT 3 // Nano Digital Pin 3 #define Y_STEP_BIT 5 // Nano Digital Pin 5 #define Z_STEP_BIT 7 // Nano Digital Pin 7 #define X_DIRECTION_BIT 2 // Nano Digital Pin 2 #define Y_DIRECTION_BIT 4 // Nano Digital Pin 4 #define Z_DIRECTION_BIT 6 // Nano Digital Pin 6 Search for "#ifdef CPU_MAP_ATMEGA328P " in the file according to your version and in the section you will find the 6 entries to modify. Once compiled and uploaded, you also can use Candela to control the machine Happy engraving, Ralph.
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