1.750 MT drill bit

My insert is too big. Although that's nothing a little grinding couldn't fix I suppose. Not really an off the shelf solution.
 
Why can you not maybe order some thick walled aluminum. Tube?

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I am turning this blank down with a 2" taper from 2" to ~ 1.220.
 
FYI Shars can be a good source for taper shank drills.
 
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