Following on from https://markwjburness.wordpress.com/2017/04/29/kruve-what-can-it-tell-us/

My sieves in the larger sizes (1200/1400/1600) arrived. Initially, I tried 500 & 1400, but the 1400 only separated out a few % at the larger end of my usual settings (not enough to make a difference should I choose to remove it). The 500 tended to leave me with a cut-off around 20%+ at the smaller end. Whilst useful if I wanted to discard the smaller particles, dropping this to a slightly smaller sieve would give me better feedback on characteristics when sifting.

Since I rarely remove the smallest particles, I figured I’d go back to 400 as the smallest sieve & also dropped the largest sieve to 1200. This x3 interval in mesh size equates to a standard deviation of 1.73 when 68% of the ground weight falls between them. This seems realistic with respect to the hand grinders I typically use. It also sits very well with my settings for 1 mug, manual drip brews.

Also, 400 as the smallest sieve will help when it comes to sharing grind settings as everyone who has a Kruve has the 400 sieve.

I also thought I’d tweak the way I record results, I figured a straight line graph would be simplest. When comparing two grinders at an equivalent setting, the closer to vertical the plot, the less of the ground weight falls outside of the sieves & the tighter distribution.

The three grinders shown below all hit mid-box extractions, with the same recipe [see, “Hario V60 Recipe for 1 mug, light/medium filter roasts.”] at the settings shown.

The Feldgrind & the Lido E are so close as to be basically the same distribution as far as this method can detect (standard deviation 1.7). The Porlex Tall has a slightly wider distribution (standard deviation extrapolated to be ~1.9), but not so wide as to make it significantly worse. Indeed, if I set the other 2 grinders coarser & stretch out the pour, I can still hit tasty, mid-box extractions at a coarser grind and a standard deviation of over 2.0.

Setting a Lido E, or Feldgrind so that 11-12% passes through the 400 sieve (2 minutes of shaking) should result in essentially the same grind setting as shown below. Typically, no part of the distribution is removed in my daily brews. However, removing just the portion over 1200 & correcting the dose weight back to 13.5g can allow a sweeter & higher extraction, without upsetting other aspects of the recipe.

You can save your own template from this Google form: https://docs.google.com/spreadsheets/d/1jXCV7TVuCAn4rPPyCVtSlD8kROhF267ePbe5iLIvE7c/edit?usp=sharing

Enter sieve mesh size, grinder details & weights captured, as required in the yellow shaded cells (all others self populate). Don’t delete all the info (name & weights) for any one grinder as you might then lose a plot & the legend colours won’t tie up any more.

EDIT: Standard deviations quoted only apply to grounds sifted with the Kruve sifter, these are not transferable to wire mesh sieve analysis.