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What are these drill bits called?
What are these drill bits called?
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Old 11th April 2012, 06:28 PM   #11
KatieandDad is offline KatieandDad  United Kingdom
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I've never had to sharpen any of mine. I only cut alluminium and very thin plate steel.

They are over 10 years old now and working fine.
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Old 13th April 2012, 04:05 PM   #12
simon7000 is offline simon7000  United States
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Quote:
Originally Posted by KatieandDad View Post
I've never had to sharpen any of mine. I only cut alluminium and very thin plate steel.

They are over 10 years old now and working fine.
Try it and see if you notice a difference. Aluminum sometimes leaves a residue on the edges that makes punching slightly harder. Steel does dull punches, but it really depends on thickness.

Some of my machine tool punches are expected to be able to punch 300,000 holes before needing to be replaced. I am on my third set for some!
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