The type of router bit many people use is a bottom-cleaning bit, & the size I use for standard Paulson
THC chips is 7/8". For these bits you usually either need to go to woodworker's shop or mail order them - I just
Amazon'd them.
The drill press you can get at any hardware store. I'd recommend against the entry level Ryobi model at Home Depot, though. A lot of people love the 6amp motor for the pricepoint, but you don't need 6 amps to scrape clay/plastic - the more standard 3 amp motor will do just fine for you. You do *not* need a standing drill press - a table/bench model should work just fine.
There's some pictures in this link that show the press/bit. It also has a good picture of the jig he's created to help center the chips. Additionally, you'll need another piece of wood - scrap or otherwise - to hold the chip in place while the press is in action (which can also be seen in the pictures).
http://www.chiptalk.net/forum/threa...otstamps-starbursts.76688/page-5#post-1238909
To judge the results, here's the results of some milled chips pre-labeling...
http://www.chiptalk.net/forum/attachments/dscn0788-jpg.37863/
And here's some after labeling...
http://www.chiptalk.net/forum/threa...otstamps-starbursts.76688/page-4#post-1177987