Hi guys, at the moment I'm a moderately complex carving out of light density hard wood ( mainly American Walnut) 200 x 200 mm to a depth of 17 mm. To complete this its taking nearly twelve hours. I use a 6 mm end bit to rough out the block then a 3mm ball nose to finish. I have however realised that I could actually get away with a 6 mm ball nose that I will buy from flea bay tonight. What I was was wondering is , is there a cutter / bit that can cut at that depth in one go ? And what in you opinion is the maximum feed rate for this material ? Have you any tips for speeding up production please ? And one more question, I'm having trouble when swapping the bits from rough to finish as in they have different shank lengths and therefore I cannot simply push it to the top and it will be at the correct depth in the chuck, anyone any tips on how to swap out bits so they are at the same depth or should I just buy end and ball nose bits with same length shanks to make things simple ?