Bobby posted above for me. To clarify. On smaller gauge materials we cut a finished hole on the table. On thicker materials like 3/16 and up we will cut the hole on the table and then simply run a construction reamer through the hole for a more precise fitment.
Here are examples of the reamers for those interested.
http://www.mscdirect.com/browse/tn/Holemaking/Reamers/Bridge/Construction-Reamers?navid=12106086
Let us know if we can ever any any questions for you guys. Bobby will be posting some on here for me. I don't always have time to get on the forums. If you need me direct feel free to email me or call the shop.
Thanks
Dan DuBose