Cutter Holding and Driving Devices For Milling Machines
The following holding and driving devices are used to hold and drive the milling cutters.
1. The Arbor
An arbor is a cutter holding device with a taper shank to fit the spindle taper hole of the machine; the short or long shaft end is used to mount and drive one or more cutters. having holes that fit on to the arbor. Standard milling arbors are made in three styles: A, B, and C.
2. A Draw-
It is fitted through the spindle, screw into the arbor and holds it too firmly in the spindle. Drive Keys on the spindle nose fit into the slots on the arbor flange provide positive (no slip) drive.
3. The Adapter
4. Spring Chuck
A spring chuck is an adapter that can be mounted in the spindle for holding and driving spring collets. A typical set of collets includes sizes from 3.18 to 25.4 mm (1/8 to in.) diameter for holding drills, straight shank cutters, and end mills. The collets holder has a ground taper shank to fit the spindle taper. Collets are held and located accurately in the holder by a cap nut, which forces the collets taper against the inside taper of the holder, clamping the collets tightly to the shank of the tool being held. Some other types of collets/devices are also used for holding cutters and tools, depending upon the nature of the work.
These are used to reduce the spindle or adapter internal taper to receive a smaller tapered shank tools.
6. Cam Lock
7. The Quick Change Spindle Nose
It is a specially designed attachment that can be clamped to the spindle nose for holding arbors and adapters. Various cutting tools needed to machine a job can be mounted in adapters or on an arbor and each used in sequence without changing the set up of the job. A special clamping ring, threaded on the outside, is bolted to the spindle nose. The adapters and arbors are placed in this clamping ring and held in a place by a ring nut. Because a draw-in bolt is not necessary much time can be saved when changing cutters.
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