Physics behind climb cutting and conventional cutting

[hihiip201]

Hi guys:


For basic info: wikipedia: mill cutting : conventional cutting and climb cutting, there's a graph showing how a mill cutting cuts.

Yesterday in the shop my instructor taught me that climb cutting gives better surface finish than conventional cutting, yet it requires more load(torque). But I have yet to understand the physics behind it.


Wikipedia page's explanation is not that satisfying either, there's nothing that it says about climb cutting I cannot say the same about convention cutting. On the page it says that in conventional cutting is slides across the surface of the part hence dulling the tool, but if I understand this correctly when you are cutting, the tip of your tool is always sliding across the new surface you are creating as you are cutting, so I don't see how climb cutting is better than conventional to be honest.

What am I not seeing?

 

[hihiip201]

The only reason I can possibly come up with , is that the chip in climb cutting acts as an mechanical leverage that allows the force to be distributed on more surface of the cutter.