Router bit recommendation, spindle speed and feed rate?

[Tenson]

A quick on-topic hijack if I may. Why do hand-held routers use straight flute cutters? A good brand is certainly expensive enough to have any design that works well. When cutting wood on CNC, is there a reason to use spiral cutters instead?

[JAZZCNC]

A quick on-topic hijack if I may. Why do hand-held routers use straight flute cutters? A good brand is certainly expensive enough to have any design that works well. When cutting wood on CNC, is there a reason to use spiral cutters instead?

Yes because hand routing is relatively slow feed rates in comparison to CNC the straight flute cutters have more time to clear chips. CNC use high feed rates so spiral upcut helps with chip clearence and still maintain a good quality finish.