What is the basic difference between UP milling & down milling?

Question

anonymous · Answer

the depth of the chip and the direction of force

anonymous · Answer

Up Milling is the operation when the milling tool is rotating in the opposite direction as the feed. This means that the teeth of the tool are pulling the chips out. It is scooping the metal starting at the bottom of the depth of cut scooping upwards. In up milling the chips start small and have a very low force at contact. This low force can cause a pull of the table, which can be dangerous if the work piece is not securely fastened or if the force is great enough to pull the table off the ground.
Down Milling

Down Milling is the operation when the tool is rotating the same direction as the feed. This means that the teeth of the tool are pushing down on the work piece. It scoops the metal starting at the top of the depth of cut and goes all the way to the bottom. The chips are generally bigger because of the high forces at contact. The high forces and high impact secure the work piece to the table.

anonymous · Answer

in the biz it is called conventional and climb