I wish to impose somewhat on you who know about this stuff. First of all I'm not at all trying to avoid the old RTF rejoinder but I don't know where to find it! I have been trying to get into CNC for a couple years. But I don't want to just plop down a couple grand and push "start", so I built a 3 axis milling table. Then I went to ebay and bought three stepper motors with power supply and control circuits (tb6560 drivers straight from hell) and could find NO documentation on how to set it up and wire it etc. I got it half way working till one of the drivers went up in smoke (literally). And I'm tired of trying to find old computers with parallel ports.
I am now trying to learn from the ground up how to use a serial port with arduino to control a cnc. grbl seems to be pretty inclusive and might be the way to go.
I managed to flash grbl 1.1 to my uno and now I want to start experimenting with the steppers. I have found several cheap and not so cheap grbl shields, and this is where I need help. First of all does it matter that I have grbl 1.1 because all the docs seem to say that the most of the available shields are for ver .9 or ver .8
Any and all advice will be much appreciated.
Hi
Please point to the ebay product so we know what you have...
I don't have anything yet but was considering "Longruner GRBL CNC Shield Expansion Board V3.0 +UNO R3 Board + A4988 Stepper Motor Driver With Heatsink for Arduino Kits " and similar or the gshield from synthetos
terryking btw, tks for the info for those sites. A lot of gr8 info. will take some time to disseminate
These links may help
Stepper Motor Basics
Simple Stepper Code
I suggest you get each of the motors working separately with my simple code before trying to get them working with GRBL. That way you will know that you have all the connections correct and, if you do something wrong you will only destroy one motor driver or motor. 
...R