I know you ask about the PC 555 model, BUT one of the best ways is the router table, most of the projects you make will fit on the router table
, and with one arbor and 3 slot cutters and the right bearings you are set to put any biscuit slot in your project.
At the right price and it's safe to do on the router table.
All you need to do it mark the stock and push it into the slot cutter and because you are using the table it right on every time.
Here's just one or two of of them, the 3 wings bits are the best by the way.
http://www.mlcswoodworking.com/shops.../biscuits.html http://www.mlcswoodworking.com/shops...hor%20slotct3w http://www.mlcswoodworking.com/shops...s/bt_slot.html
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Review below on the PC 555
http://www0.epinions.com/content_6471716484
Bj