Carbide bits do not require any special tightening. If you follow the 1/4" rule and take off no more than 1/4" in a single pass you should not have any problems. Multiple passes are always recommended; this reduces the load on your router, avoids overheating the bit, eliminates burning the wood and gives you a better finish cut. Perhaps the most common reason for a bit to come loose is it was seated all the way in the bottom of the collet. This does not allow the collet to tighten properly. An easy way to prevent this situation is to insert an 1/8" o-ring with a 1/2" OD into the collet before installing the bit. A thin fawcet washer can also be used. The rubber will compress and allow the collet to tighten properly and it gives you accurate installations of the bit every time.
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Mike
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