I have been using the following approach to Zero Z probing after I damaged my table top and I would like to share it with you and also ask for your comments and advices. I know there are some better methods for this out there but this one in particular makes a lot of sense to me due to its simplicity and low cost. Also, it is good enough for the kind of work I do (mainly wood). The approach is as follows:
- Using the embedded Z probe (see drawing below), I Z-zero the machine at table top.
- Measure the working piece thickness.
- Z jog the machine to that thickness.
- Z zero the machine again
- Now the machine Z-zero is the top of the working piece
The main advantage to this method is that the router bit will never touch the table top and the router will correct any thickness irregularity that the piece may have.