Help pls in designing cnc

[Paul Hemans]

I am completely new to cnc.
I want to build a cnc for cutting mdf. I would prefer to have the motors slightly overspec'ed for the job. I also want the controller to be arduino based (which is why I am here). 

My problem is that I am a bit confused as to the way to drive the motors, as I would like reasonably strong motors and I am not sure the gshield will drive them.
Are kits like this Wantai setup possible to be controlled via Tinyg G2 running on a due?
http://www.ebay.com.au/itm/221541459102?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Would the gshield do the job, or can I cable directly to the drivers in the Wantai kit?

This is the spindle I am going to use
http://www.ebay.com.au/itm/151748133545?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Are there any pages that might describe how to control larger motors using the tinyg G2?

[Carl McGrath]

These are just quick look comments:

It would appear that the kit you highlight is intended for use witha MACH3 (parallel port) but the individual drivers are probably compatible with tinyG2/DUE.

TinyG(and G2) are enable-bar (active low enable), a simple inverter could solve that.

Providing spindle speed control will take some effort, if you want automated (computer controlled) speed.

It does not appear that the controller directly accepts a PWM pulse rain

Some addition places to look:

https://plus.google.com/communities/110852928951643236736 - Many Ox users are using G2 and external drivers

https://www.synthetos.com/forums/tinyg/tinyg-support/  The tinyG wiki - some discussion on G2 and external

https://github.com/synthetos/TinyG/wiki/TinyG-Using-External-Drivers - Most of what applies to tiny G would be same for G2/DUE. Both are 3.3V logic

[Paul Hemans]

Thanks for the info Carl, I'll have a look at the links.