Let's Make Robots!

New Arduino Mega CNC machine......(UPDATED)

Cutts soft materials, wood, plastic etc.

My new machine, the other one was a prototype, now this one will use all the electronics....

 

Made with MDF, bigger than the prototype......

Almost done...

 

 CONTROLBOX.JPG

My new control box, X, Y, Z axis, DB9 conector for the limit switches, and usb conection to computer.

 

ARRANGEMENT.JPG

 

 

 Better cable arrangement.....

 

 

 

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can you route pcb with it?
yes it can route a pcb.........

The Arduino Mega is conected to my PC using USB, then the steppers are driven by SN754410NE Hbridges....

On the arduino side i modified the reprap gcode interpreter to listen the usb port for instruccions.... the reprap firmware controls the steppers by standard step/dir pins, but mi drivers use a diferent two pins settups.  The stepper driver circuit is on the arduino webpage, two pin stepper control. the code i am using is on sourceforge/proyects/cncarduino...

 


 

 

bipolar_stepper_two_pins2.png 

 

 


https://sourceforge.net/projects/cncarduino/

 


 

 

 

Hi, this is newbie question.

Where is 'step pin' and 'dir pin' on that schematic?

I found function do_step() in stepper_control.pde file.
Is this function to drive the stepper? 

Thanks.

it´s not esy to design the z axis, it depends in your machine size and the tool you are using. for the other part of the machine i consider easyer to have a steady object and move the tool.... the best way to do it is to drive two steppers on the y axis, side by side...... but mi design uses one stepper on the center....... look at this page... http://www.cncroutersource.com/do-it-yourself-CNC-router.html this is a good resource for designing a cnc machine........  this page opened mi eyes on the design things i must have in my mind when building the machine.

 hope it helps...

i decided to use sn754410ne hbridges for two reasons.... first, is the one i can find here... two, it is the best replacemente for the l293d hbridge... i think is better.

 

there are lots of ways to drive steppers, in fact you don´t even need the arduino (microcontroller) but my goal is to use an ethernet shield or a sdcard reader to load the job and then execute....

 see ya.

 

 

 

zaxis.JPG

z axis pic shows limit switches... 

 

worked1.JPG 

 

electronics.JPG 

 

these are my electronics, arduino mega and stepper drivers... first messy setup..... lots of cables. item on the redesign table....

 

 

 the  diagonal play on the X-axis ? do not understand the question...

buddy, i used two bearings ontop of the allunimum rail and one on the bottom of the rail to hold the structure down. if it is well adjusted is almost does not have the play that you say.... also it has a piece of mdf from one side to the other to keep it square. the lead screw is attached to the center of the structure. your solution is the best one to avoid that problem..

 

 

i am having serious problems on understanging design software. cad or cam, i am impressed, i build the machine, i test it with downloaded codes fron the internet... but i cant make my own designs........ what a sh*@$t....... help..... please....