by boar_d_laze on Fri Dec 09, 2011 3:31 pm
Eyeballing is measurement. It's accuracy depends on the eyeball.
I don't think anyone in this thread has espoused never measuring. Rather the thrust of the "don't weigh every time" side of the argument is not to weigh every time as opposed to never measuring or never, ever weighing.
Like Marshall, like a few others, and as I made clear in my first post in this thread, I use my grinder's timer for everyday measurement.
In my opinion, the "weigh every time" argument doesn't stand well on its own without a great deal of context. At minimum it needs to be said that some baskets and machines are very particular about particular weight ranges, others less so.
Similarly, dose weight doesn't mean a hell of a lot without extraction weight... in other words, brew ratio.
Distribution comes into play very strongly as well, as exact weights don't mean much in the face of varying extraction ratios, i.e., whether the coffee is under, fully or over extracted.
Accuracy is as accuracy does.
Something people should have learned in high school chemistry is that you can't make an entire system more accurate by more accurately measuring a single element. That reduces one aspect of inconsistency, which is very nice, but until you've got a decent handle on ALL of the important variables you're dancing in the dark.
That basic truth seems to have gone by the wayside for a lot of people. Not all, but a lot. Science can become "anti-science" by over-reliance on some things and inadequate consideration of others. Context. Context. Context.
It makes more sense as a matter of practical convenience to weigh beans for single dosing, than it makes sense to weight already ground coffee when beans are dispensed from the hopper. With sufficient accuracy in the alternative methods of measurement (timer, doser thwacks, overload and finger wipe, or whatever works to "good enough") convenience trumps accuracy.
The argument that Marshall needs to supply concrete examples of great shots made without weighing is poorly taken in that the burden of proof is on those who claim there's only one way of doing things well. However, if you must: Heather Perry, Scotty Callaghan, Marshall and me. You may doubt Marshall and me, but what about the other two?
Don't quote Jim Schulman on the importance of consistent and accurate weighing to me, unless you include the complete context of Jim's methods -- which include, inter alia, not adjusting grind for conditions, and the limitation that different coffees get different weights. The same goes for Dan, Jim Fox and a lot of other authorities whose acumen, taste and methods I greatly respect.
I am (or more accurately, we are) always interested in what they say and enjoy puzzling it out, but they're not the only role models on the block. Actually, the same goes for me. If you think about what I've written and it enriches context, whether or not you do as I suggest, I've succeeded. I can't speak for him, but it appears Marshall has the same goal.
My old machine was fine with it, but my new machine didn't do well with overdosing the stock basket and finger wiping to set the dose. Empirically, the La Cimbali does best with an 18g Strada basket in the stock, double pf; and an 18g (plus 0.3, minus 0.5g) dose. The combination of machine, pf and basket are cranky that way. With a known and dialed in bean, my Max Hybrid doses close enough for exceptional espresso using my attached timer. Weighing every shot isn't necessary; and great is good enough, at least for me.
Similarly, I get enough information about brew ratio and extraction levels by watching the stream and the surface of the pour. When I do weigh (and yes, I occasionally check just as Marshall does), I find that my brew ratios are very consistent with those coffees I brew often; variables sufficienly controlled.
New coffees and roast profiles require calibration of timer and senses. No surprise. My scale (remember, my basket wants something pretty damn close to 18g) makes things easier
Along the same lines, it's a good idea to encourage beginners to purchase a scale which can weigh doses and shots; and use it to determine an appropriate dose range for their equipment, and their preferred dose ratio(s). But, I agree with Marshall that over-hyping the importance of extreme accuracy can be off putting, and that our primary responsibility is to encourage rather than brow beat.
My experience in preparing food -- including general cooking and bread baking -- tells me that accurate measurement can only take you so far. That relying only or too heavily on numbers is limiting. And that going beyond requires "touch" and taste.
You may be more of an exact measurement recipe follower than a line cook or recipe writer, and still be a great cook. Nothing wrong with it. Certainly, you can save yourself a lot of time and grief by dialing in the acceptable (or even "very good" if you like) before you start delving too deeply into nuances.
My scale is very helpful for set up and to occasionally calibrate other methods of measurement (including those which are strictly sensory), but once set up and calibrated, weighing every time is far more nuisance than an aid. That said, I respect you, your palate, and your methods even though those methods are not mine. Please respect mine (and Marshall's) equally.
BDL