Conventional Milling Machine
The Milling Machine uses a rotating milling cutter to produce machined surfaces by progressively removing material from a work piece. The vertical milling machine also can function like a drill press because the spindle is perpendicular to the table and can be lowered into the work piece.
VERTICAL FEED HANDCRANK
HIG-LOW SPEED CONTROL
QUILL FEED HANDLE
QUILL FEED LEVER AND SELECTOR
These readouts were added to the milling machines to aid in the accuracy of cuts and increase productivity. The lateral movement of the table can be measured to 2/10,000th of an inch with the readouts. Other operations the readout can perform include dividing any dimension by two, running with absolute or relative measurements, and displaying in inches or millimeters.
Peripheral and Face Milling Techniques
Peripheral milling uses teeth on the outer edge of the cutter body. The surface produced corresponds to the contour of the milling cutter, which can range from a flat surface to a formed shape.
There are two different methods of peripheral milling, Conventional or Up Milling and Climb or Down Milling. The figures on the left show the rotation of the cutting tool with respect to the direction of the part on the table.
In conventional milling the work is fed against the cutter which compensates for backlash in the table. Each tooth of the cutting tool starts its cut in clean metal, prying the material off the work.
Down milling will give a better quality of work and is better suited for thin pieces of material since the cutting action forces the work into the table. This method should not be used on hard materials and the machine has to be rigid so backlash cannot occur. The cutting tool will also last longer using Down milling as long as good tool pressure is maintained.
The machines in the shop are suitable for both types of milling. If you are unsure of which method you should use ask somebody in the shop for assistance.
Face milling uses the bottom of the mill to machine the work instead of the sides. The cutting comes from the combined action of cutting edges located on the face (or end) of the cutting tool as well as the edges on the periphery. The direction of the feed with relation to the rotation is not important when using this method.