Do you guys use the default surface speeds in GWizard or do you amend them with data from elsewhere?
The default numbers for an uncoated carbide 2 flute end mill for aluminum are considerably higher than the ranges I've seen in other calcs,
GWizard shows 1200+ SFM vs 500-800 in other calcs.
Doubling this number means a huge increase to the spindle speed and feed recommendations.
This would be a good thing if I can rely on the default surface speed numbers. It's not so great if the calc is relying on me amending that field with external data (that I don't have)....
If I am meant to amend the surface speed, how do I calculate the correct number?
Tool manufacturers usually state a range that's too wide to be useful (or nothing at all). Is it just a guess or is there any science to this number?