Carbide tools sharpening

[komatias]

Not done endmill but this is how I do my carbide scraper blades:

Start with the 150 to get the shape, go to 300 to refine and then lap using diamond past on an aluminium wheel.

You will be taking very little of the actual carbide off so it may not be suitable if you have chipped or broken bits.

[paulus.v]

thanks komatias!

then I will start with grit 150 and 400 wheels. Probably more than 400 will make no difference on my cheap carbide bits...