Abstract: Apparatus for the in-place machining of trailing axle spindles of self-propelled motor vehicles utilizing a spindle shaft retained within a housing. The apparatus includes frame means with inner and outer end panels, and with the inner end panel having a bore for receiving a spindle shaft therethrough. Clamping means are arranged to dispose the bore concentrically with the spindle being machined. Drive means are provided, along with a main drive shaft mounted for rotation within each of the end panels. A second drive shaft in the form of an hexagonal drive shaft is also mounted for rotation within the end panels. Cutter head carriage sleeve means are journably mounted on the drive shaft and include a carriage body along with a hollow cylindrical housing journably secured to the body and having a plurality of radially disposed cutting blades coupled thereto. Preferably, an uneven plural number of such cutting heads are utilized to provide for proper treatment of the work.