Can you sharpen on a firebrick?

Discussion in 'Sharpening Station' started by inferno, Sep 11, 2019.

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  1. Sep 11, 2019 #1

    inferno

    inferno

    inferno

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    I'd say no. unless you are "sharpening" unhardened steel that is.

    So today at work i sawed up a hard firebrick for my forge. i used an angle grinder for this. and it took a long time. and the brick ate the first cutoff disc very very quickly. switched to cubitron and then it lasted like 3-4x longer. it still was very slow.

    so i figured maybe these firebricks are hidden gems for sharpening. and guess what. they're not.

    I tried the light yellow one first. its very coarse. like 50 grit or so. and while it did abrade unhardened steel pretty fast. It did absolutely nothing on my 15n20 blade i'm trying to grind a main bevel on. well it lightly scratched it. thats it.

    then i tried the 15n20 on the orange one. and this was was even worse. if thats even possible. Supposedly it a lot of aluminum oxide in these stones. i guess it doesn't really matter.

    don't try this at home!

    because its a waste of time...

    I do however guess these are better than flower pots and probably asphalt and regular concrete. and maybe even better than common garden rocks. but i didn't really do any comparison test here. Not going to either.

    firebrick.JPG
     
  2. Sep 11, 2019 #2
    You should do that comparison test :D
     
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  3. Sep 11, 2019 #3

    kayman67

    kayman67

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    They look good though ☺️☺️☺️
     
  4. Sep 11, 2019 #4

    Xenif

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    Just stamp it with a Honyama stamp and the performance should improve significantly
     
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  5. Sep 11, 2019 #5

    Garm

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    Looks like some cool renge on the left one..
    Maybe use the other as a nagura?
     
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  6. Sep 12, 2019 #6

    HRC_64

    HRC_64

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    I'm pretty sure this is why they bothered to mine all those cutting stones back in the day :p
     
  7. Sep 12, 2019 #7

    Cbt

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    Your experience reminded me of a video on youtube I never bothered to watch about sharpening on a brick.

    Nevertheless here is the link:
     
  8. Sep 13, 2019 at 12:54 AM #8

    Chuckles

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  9. Sep 13, 2019 at 10:52 PM #9

    inferno

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    i guess my bricks are actually more abrasive than those in the vids. i guess you can do it up to a certain hardness. 62-63 is not it.
     

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