dognose Posted January 21, 2014 Share Posted January 21, 2014 Assuming you have two of the same pieces of a known type/alloy of steel, let's say S2 for example, would the sparks appear the same to the eye if one of the pieces were in an annealed state, and the other in a hardened state? Quote Link to comment Share on other sites More sharing options...
HWooldridge Posted January 21, 2014 Share Posted January 21, 2014 The chemistry and carbon content is the same in either so there should be no difference - that being said, I admit to never testing that theory in the shop. An easy experiment is to anneal an old file on one end only and compare the spark on both ends. Quote Link to comment Share on other sites More sharing options...
Stefflus Posted January 21, 2014 Share Posted January 21, 2014 Yeah this needs trying. My guess based on fuzzy remembering (I wasn't looking for this, I was just grinding) is that one might get "leaner" and shorter sparks due to the particles ground being smaller and fewer Quote Link to comment Share on other sites More sharing options...
Stefflus Posted January 29, 2014 Share Posted January 29, 2014 This video shows the same grinding procedure prior to and after hardening, the sparks are actually richer as hardened, contrary to my guess. @ ca. 17min and 20min Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted January 29, 2014 Share Posted January 29, 2014 Stefflus; do you get more crumbs when you tear apart fresh moist bread or old dried bread? Best analogy I could come up with. Quote Link to comment Share on other sites More sharing options...
Rich Hale Posted January 29, 2014 Share Posted January 29, 2014 And now I want a sammich... Quote Link to comment Share on other sites More sharing options...
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