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Would a 3/4" roughing endmill be too big for my PM-835S?
- Thread starter Pcmaker
- Start date
- Joined
- Jun 12, 2014
- Messages
- 5,071
One is SFM, the second is IPM which is a function of the SFM/RPM. You are looking at a particular feed rate where you are getting a chip load per tooth. Falling to far out of this will cause increase wear and poor performance. As I mentioned, I use the calculations as an approximation starting point and will be machine specific. With the first pass I usually do it manually, I look at the chips coming off as well as the feel/feed pressure, vibration of the mill and my DRO reading of IPM. In doing repetitive passes I use the power feed. It can be done manually as well, but it helps to know the IPM. If milling a material that work hardens, a power feed will give a more consistent chip load, and decrease the risk of work hardening. Power feeds also will give a more consistent finish, although this is less of an issue with a rougher.