Machining A36 plate

Rough with a cheap coated 4 flute 1/2" carbide? Does it need to be 5/8?

You can buy them in 1/2" for under $30 each...
 
No doesn't have to be 5/8". 5/8" is what I had on hand.

I just bought this. The outside profile is very loose as to dimensions. can be .005 over or undersized. I used a 5/8' rougher/finisher and the finish was acceptable. So I just bought this off ebay. A rougher/finisher keeps me from having to finish the profile with another tool which cuts machine wear and tear.

 
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