Need to create a slot a circular disk can fit in

[darrellmead (Darrell J Mead)]

I need to have a 1/4 bit start at the wood surface, as it travels 2.15 inches, I need it to cut down to .7 inches and back up to the surface. This will allow a round disk fit into the slot snug. It should be easy in 3d modeling, I am just missing it.
Any suggestions?
Thanks
Darrell

[WillAdams (William Adams (Carbide 3D))]

It will be necessary to model this a bit larger than the end result.

and to model the stock in its full thickness:

Apply

Then, model the rounded removal:

Then draw in the region which one wishes to define the slot:

and add the area which defines the Stock to the selection by shift-clicking.

Then model it to thickness equal to the stock:

Apply

[darrellmead (Darrell J Mead)]

Thank you, I was hoping it was simple.
Darrell