Resharpening dull taps by hand is probably not a good idea when you could be making parts. Plus, a thorough reconditioning requires a grinder designed for grinding the actual tap form. So resharpening dull taps is one job best left to the experts.
Source article: https://mfgaxis.com/press-releases/considerations-when-having-taps-resharpened/
Company: Tapco Cutting Tools Inc.
Press Release: Considerations when having taps resharpened
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