From the course: Introduction to Mill and Lathe Operation
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Up versus down milling
From the course: Introduction to Mill and Lathe Operation
Up versus down milling
- To upmill or downmill? That's the question. On your end mill, you have extended the spindle to cut your part, then the table starts to move. It is absolutely critical to know the direction the table moves relative to the direction the cutter is spinning. The easiest way to know the direction of travel is based upon what the cutter would do to the part. As the cutter is spinning, does it want to push the part away or does it want to pull the part in? Upmilling, which is also called conventional milling, would push the part away from the cutter. In the days before CNC mills, pretty much everything was upmilled. You push the part against the rotation of that cutter. With the advent of CNC mills, you now have the ability to downmill, or climb cut. It's called climb cutting because the cutting action pulls the part in to the cutter. When you're doing any manual milling, the direction your part moves as it gets cut is an absolutely critical factor to consider. You can only go in one…
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