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Blasting Abrasive

Discussion in 'Fit & Finish' started by dancom, Apr 25, 2014.

  1. dancom

    dancom Dust Maker Best Shop Tool

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    For Christmas, I received a sand blaster (enclosure type) and haven't had a chance until now to get it installed and the airline hooked up.

    I was wondering if anyone can share some wisdom on what type of abrasive to use on stainless steel, 154 flavours in particular. I am looking for a matte silver finish.

    So far it looks like aluminum oxide, glass bead, steel shot and walnut shell is readily available.

    Also, what sort of blade prep is required before blasting. I have one ready to try blasting that is sanded up to 400 grit. Do I need to take it to near mirror finish before blasting?

    Thanks as always for your expertise.

    Dan
     
    Last edited: Apr 25, 2014
  2. Alexander13

    Alexander13 Member

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    The only abrasive I have any experience with is aluminum oxide, 180 grit, and it gives a matte gray finish, not really silver. Although it might be different with a higher grit.
    As for the finish prior to blasting, I think 400 should be good, but really I don't think it makes a difference because you are completely refinishing the surface with the sandblasting medium. Before you use an actual blade, though I would take a few little pieces of scrap with different finishes to see if it does make a difference, but my hunch would be no, but it's always best to test before you potentially ruin a finished blade.
    I would think that very fine steel shot and very fine Aluminum oxide would be your best starting points.

    Sorry can't be any more help than a few suggestions.
    Joel
     
  3. dancom

    dancom Dust Maker Best Shop Tool

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    Thanks Joel.
    I've found that some makers claim to use a mix of aluminum oxide and glass. Perhaps the glass has the effect of fining up the grit(?)

    I hear ya. I'll certainly try my techniques on some test pieces before ripping into my hard work.

    Dan
     

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