I found an even cheaper source of endmills:
www.drilltechnology.com
I e-mailed them, and got quoted these:
Quote:
5 Pcs EM2XL-0400 US$4.75/each
10 pcs EM2XL-0400 US$2.50/each
I would try it without TIN coating. This is Sub Micro Grain Carbide and it very hard so wear against copper should not be an issue.
TIN would just add extra cost.
I have never done TIN before but I would imagine it is US$2.00 each.
It is considerable because of the Minimum that I hit against with the coater.
We send it out to get coated.
TIALN is also available and that is US$3.00 each.
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At $2.50, I can send one to JD for the top, and the rest to Fixittt.
What do you think guys?