For those of you watching the LIDO progress.....this is what seems to be becoming a weekly update....
We are about 1/3 done with our grind distribution study, and you can imagine that we have a lot of grinding to do. We started out (Saturday, our semi official day off) to make a correlation between burr adjustment setting and predominate particle size, to see if we could calibrate the grinder in a slightly more geeky way. What ensued, besides a LOT of grinding (Red Bird Espresso 6 day post roast) is what is, to us, a very interesting set of numbers. We started at the coarse end of the range after testing our sieve system using a Ditting batch grinder with new tooled blades as a benchmark. Once we got the methodology worked out to be consistent using the Ditting and vibrating the stack of sieves by holding them on the edge of our mass finishing tub vibrator (30 seconds rattles both the teeth loose and the particles through)...10 gram samples all with the separate sieves weighted, 3 repetitions each for burr settings on the LIDO (2.5 turns of the adjuster from 0, 2.25, 2.0, 1.875, 1.75, 1.5....that is as low as we went for our first session....frankly, as a former lab tech this type of work does bring back some memories, not necessarily good ones...a bit on the tedious side as these things are wont to be). At least we had some good smelling coffee to work with! I had dialed in the LIDO for press at 2 turns on the adjuster from 0 and from the data found that I could go from 1.75 to 2.25 and then tweak the steep time at will...for an espresso person this is all quite enlightening.
Anyway, what we are seeing so far is what we expected to see from a conical burr, or at least the small size conical. Since we are starting on the coarse end of the range we are getting a nice big hump of particle size in the 1mm size range with fairly constant super fines (about 5% of total on the Ditting and about the same on the LIDO) and as the burr setting is tightened by small increments there is not a lot of change until we enter what would be thought of as the drip range.....medium coarse or the coarser end of the fine range....this is where we stopped yesterday but what seems to be happening is that as we tighten the burr the bimodal nature of the grind is starting to show itself. I am sorry that we burned out on the grinding because from the graphs we got it is all starting to get interesting as we go finer and we look forward to getting the time to grind out all the data points to try to better understand just what is happening with the burr and the particle size across the setting spectrum.
After an hour or so or hand grinding I had a brain phart and put a nut on the axle, rigged up a simple interloc and ran the LIDO on a cordless power drill at slow speed. Dual fuel!!! How sweet it is
More to come...still waiting for the neoprene travel bags. 165 American.