The amount should be something like .25 or .5 of an inch. It cannot be more than 1" or more than the thickness of the board. If you want it to all cut out at one time, do not select it. Remember if you make it too little, you are putting a lot of pressure on the two ends of the bit and it may snap. Most wood types can be made with one pass. Some may need two or three passes.
CarveWright CX Packaged System - starting at $2000
CarversClub 1 Year Subscription - $150.00/year
Adv. Support w/out CC membership - $25.00/issue
CarveWright Community Forum - PRICELESS!