Does the router OF 1400 take all collet sizes?

Yes, the OF 1400 takes all collets. The router comes with the ¼ inch and ½ inch collets as standard and other sized collets that will fit the OF 1400 are available if requied.  Note: Collets need to be purchased complete with locking nut as the various sized collets have a uniques rubber ring that locks it into the locking nut.