I want to know if it is normal for the back or bottom end of a drilled whole to looks like this. What can I do to improve it and or what is the best way to clean it up. The material is alum. Thank you in advance, Similar Threads: Anyone indicated off a vertical side hole?Newbie- Trying to figure out how to do back side of part. Deburring the back side of a hole side mount tool changer-I take back what I said aboutNeed Help!- Help cuttting from the back side??
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