My first router table will use a free Roto-zip tool.

It's basically a much more powerful and larger version of a dremel tool.



My Z axis will have 4 inches of travel.
I am not sure how high off the table surface I should make the Z Axis tool holder.

If I had a 2 inch long drill bit in my rotozip, I would have to start with the Z axis lower so I can reach the workpiece.
If I had a 4 inch long drill bit in my rotozip, I would have to start with the Z axis higher.
Then there's the workpiece surface height to consider.
I guess I have to decide what the maximum height of a workpiece material will be?

It would be nice to be able to slide the RotoZip up or down and relock on the Z axis tool holder for different height tools.
My brain is spinning trying to figure out where a good place to fix my Z axis tool holder.

Any suggestions on what the real world operating conditions would be, typical tool lengths, etc.
How have other people set up their z axis tool holder heights above the table surface?

Thanks for any help.