Simple block removal program

I don't have computercraft coding experience, and I would like a mining turtle to remove the outermost layer of a 7x7x7 cube when I turn on a redstone wire. I don't know how to do this but it seems simple enough. Could I have some help?

Thanks in advance

We can help you, but we won't write it for you. Take a look as some of the other code posted on the forums, and the wiki available to you at your convenience. Come back here with what you get, and we would be happy to help give you suggestions, or pointers.

don't forget: we will need more details than that. we need to know the position of the turtle relative to the cube, will the turtle have to go back to the original position afterwards, at a later stage would he have to put the layer back?