1. Welcome to the New & Improved BladeForums. New software info here. Please report problems in Tech Support, and read existing threads before posting! - Spark
  2. I've changed the default forum style to Flat Awesome based on feedback. Don't like it? Click here to change how the forums look Feedback on this is welcome here.

Spark Bong Dust Collector

Discussion in 'Hammer & Tongs' started by J. Hoffman, Dec 12, 2015.

  1. J. Hoffman

    J. Hoffman

    Jan 1, 2011
    I did this video showing my spark bong that I made for collecting dust and sparks from the grinder. Check it out and feel free to ask questions, or bring up concerns. I'm sure it's not perfect.
  2. Bill Sutherland

    Bill Sutherland

    Mar 13, 2016
    Mr. J. Hoffman,
    Your idea is great, it gets the job done, and done well!
    Is there a way to use the gravitational pull/fall of the spark debris within a non-heat-conducting pipe material, in addition to a copper tube heat sink positioned in the center of the downdraft pipe that pulls the heated air up and out of the bucket? The more you create sparks, the hotter the copper tubing becomes, and the more aggressive exhaust of heated rising air will create a negative pressure in the bucket which will suck-in the cloud of sparks. The size and configuration of the copper heat sink will determine the success of this design. A number of medium-sized copper tubes or a coil of copper tubing feeding into one small vertical tube will increase the velocity of air being exhausted. The catch pipe must not absorb heat, but must direct the sparks and heat to the heat sink tubing.
    If this works, there may be no need for a noisy shop vacuum.
    Thanks for your ear,
    Bill Sutherland
  3. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    That sounds good in theory, but what you are talking about is convection, not extraction. You need a moving air volume to extract the fines and the dust. It requires a shop vac or a large blower.
  4. Cody Hofsommer

    Cody Hofsommer

    Dec 2, 2011
    Jess, any idea what percentages of grinding dust ends up on the bong versus the shop vac? Or maybe a better way to say it is, how much makes it to the vac?
    I'm assuming you only use this for steel, not handle material.

  5. melsdad


    Apr 3, 2008
    With this set-up do grind both steel and wood without issue?

Share This Page