I have a very specific and weird task I need to accomplish.

I have a concrete wall that I need to get samples of the concrete dust to grind and get them tested, i plan on using a plunge router with a vacuum collar type setup with a grinding head of some sort ... problems are

  • needs to be in-situ ( i can't do a standard core then chop it up )
  • I can only find one grinding head that appears to do what i need https://i.imgur.com/4IhxHMW.png
  • needs to be about 50-70mm diameter sample area and not miss any of each "layer"
  • i need to do this about 50 times and i'm not sure a vacuum bezel head will last long?
  • i need to drill in 0.5mm increments each sample of the dust

i thought id check and see if anyone else has an idea of an easier way I could accomplish this! Surely i'm not the only one who has encountered something like this.


  • $\begingroup$ Sounds like a drill with a drill bit... $\endgroup$
    – Solar Mike
    May 10, 2019 at 4:50
  • $\begingroup$ @SolarMike concrete drill bit's have a tapered end... i need to be going in depths of 0.5mm exactly not slightly more in the center compared to the outside .... $\endgroup$
    – Luke Smith
    May 10, 2019 at 5:00
  • $\begingroup$ Re-grind a spade bit... $\endgroup$
    – Solar Mike
    May 10, 2019 at 5:29
  • $\begingroup$ Drill out a core, then make saw cuts (like partial slices) using a thin blade. if you cut from various points you may be able to get the "definition" you require. $\endgroup$
    – Solar Mike
    May 10, 2019 at 9:47
  • $\begingroup$ @SolarMike see first bullet point $\endgroup$
    – Luke Smith
    May 10, 2019 at 10:35


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