Q. Are there advantages to having a router with a 1/2" chuck rather than a 1/4" chuck? Are the 1/2" bits that much better?

A. (Rob Johnstone) "The only advantage to a 1/2" chuck is that you can use bits with 1/2" shanks. The chief advantage to the larger shank size on a router bit is the amount of power you can deliver to the cutter. Also, a larger shank can support a larger cutter head. The other obvious advantage is a router that accepts a1/2" collet will also accept a 1/4" collet. The opposite is not always true."

A. (Michael Dresdner) "You can add a sleeve insert to make a 1/2" chuck accept 1/4" bits, giving you more versatility in the bits you can use or buy. I often get resharpened 1/2" shaft bits at cheap prices. Once they are sharpened, the outside cut diameter is smaller by about .007", which creates problems for users of multi-head CNC machines and pin routers. These folks often sell off these very useful but slightly undersized bits for a song. Also, the shaft of a 1/2" bit is twice as thick and therefore stronger, which may result in more user confidence when you are pushing wood through one of those huge panel raising bits."

A. (Rick White) "As the others have mentioned, you get a lot of flexibility with a 1/2" chuck because it can be adapted to use both kinds of router bits. The heavier shaft on 1/2" bits will also reduce chatter when you're cutting because you'll be using a bigger bit. The larger bits also run cooler."