PCB ROUTER MACHINE

hi jeswanthmg
how u manage the mechanical work of cnc

well i am an ECE student i have experience in carpentry, and i have done research on cnc machines for more than 3 months now i am becoming clear of it but i guess i can do it sir

well i am an ECE student i have experience in carpentry, and i have done research on cnc machines for more than 3 months now i am becoming clear of it but i guess i can do it sir

jeswanthmg

thats good if u have experience of CNC machines that will help you a lot....

i am agree this project will take long time.....but be patient and passionate

did u select motors?? which servo you will use for three axis movement???

which motor u will use for spindle movement mean that will work as drill.... will use D.C motor with PWM drive ??? did u select any thing or collect any data regarding this... ?

@coolmirza

well i dont have experience working on them but i guess for past 3 months i have collected enough information to construct my own i guess

yeah i am very very passionate about it

yeah i have selected the motors but i am not doing it on servos i will be doing it using bipolar steppper motors of 1.8 degree step angle which looks almost like this



its from japan servo co ltd

For spindle motor i will select it after completing whole CNC and testing it by just drawing a 2d diagram yes i will include PWM drive it would be nice

i am just worried about the backlash problem what do you suggest for it which method should i do

@jeswanthmg your thread is really interesting i like it

Hope you wife and girlfriend both are fine

i don't think you need motor like this for axis movement!!! why are u using this high power motor ?? you can use simple stepper structure using two small motors see this..







here is one more 3 Axis CNC machine



you can see all step by step making of hardware with PICs here....

Easy to Build Desk Top 3 Axis CNC Milling Machine

here is stepper motor driver circuit...



and PCB



for more info of above schematic and PCB see this link

@AJAY

LOL i thaught you are a serious geek you to have good sense of humor he he he

@COOLMIRZA

Ya i have seen them but the one i am working on is this big



cause i am thinking of using it to engrave big boards and wood carvings etc so motors require more power but i am not getting good threaded screws and bolts, also i am not able to solve the backlash error completely i require guidance on it

cause i am thinking of using it to engrave big boards and wood carvings etc so motors require more power but i am not getting good threaded screws and bolts, also i am not able to solve the backlash error completely i require guidance on it

jeswanthmg

As you know from your research, backlash and general accuracy is mainly down
to the quality of the screw drives and rigidity of the framework.

I don't see why steppers should give extra backlash, just use as fine a step angle as possible.

@EXPERIMETERUK

no sir i am not saying stepper motors problem but without assembling the threaded rod i can observe considerable backlash i just want tips on how to reduce them what type material is good as it is my first time

@EXPERIMETERUK

no sir i am not saying stepper motors problem but without assembling the threaded rod i can observe considerable backlash i just want tips on how to reduce them what type material is good as it is my first time

jeswanthmg

there are two methods of removing backlash software based and hardware design based like Preloading...

see these links for more help...

http://www.machinetoolhelp.com/Repairing/What_is_backlash.html

http://www.machinetoolhelp.com/Repairing/Backlashaxis.html