I am replacing the cutters in my jointer and debating between high speed steel and carbide.
What are the advantages and disadvantages of HSS vs carbide jointer blades?
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All else being equal, anytime you have a choice between HSS (high speed steel) and carbide, you have to consider the tradeoffs.
When does it matter?
If you're looking at long jointer knives, high-speed steel is a proven material, and if you happen to completely trash your knives by running nails through your machine, the knives aren't very expensive to replace.
If you're looking at a cutterhead with segmented knives or inserts, carbide is a good choice because at worst you'll shatter the inserts that hit the nails.