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fra589 / grbl-Mega-5X

5/6 Axis version of Grbl, the open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on an Arduino Mega2560
https://github.com/fra589/grbl-Mega-5X/wiki
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How to interface with a Scara robot - A, B and Z axis #191

Closed tarsisprado closed 3 years ago

tarsisprado commented 3 years ago

I am developing a simple Laser Scara Robot (two rotating joints and a linear Z axis). I am new here and I am starting to use grbl now. As my robot only has three axis, I would like to use grbl-Mega with Arduino Uno and Uno CNC shield. Is it possible? The grbl for Arduino Uno can only control 3 linear axis until I know. Coud you please help me interfacing with my Scara robot? Any help would be really appreciated.

Thanks in advance.

fra589 commented 3 years ago

Hi @tarsisprado,

The Grbl-Mega version of Grbl work only on the chip Atmel AVR ATmega2560 which has more resources (FLASH, SRAM, and EEPROM) than the 328p.

My Grbl-Mega-5X version work weel with the RAMPS 1.4, 1.5 or 1.6 shield which is not much more expensive than the Uno + CNC Shield.

You can do what you whant by editing the config.h file with this: 

(...)  
  #define N_AXIS 3            // Number of axes
  #define N_AXIS_LINEAR 1     // Number of linears axis
(...)  
#define AXIS_1_NAME 'Z' // Axis names must be in X, Y, Z, A, B, C, U, V & W.
(...)  
#define AXIS_2_NAME 'A'
(...)  
#define AXIS_3_NAME 'B'
(...)

The Z axis must be the firsh axis as linears axis must be located before the rotating axis in the internals calculation structures.

@++;
Gauthier.

tarsisprado commented 3 years ago

Hello Gauthier,

Thanks very much for the quick reply. I also have Mega and Ramps 1.4 here. I will try the changes you suggested in config.h, seens very easy! Thanks again for your support.

fra589 commented 3 years ago

You're welcome