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Ross Droplet Technique-Eliminating Grinder Static - Page 7

Postby jonny on Sun Dec 23, 2012 2:14 am

RapidCoffee wrote:Apologies for thread drift, but +/- 1g is not good enough. That's why nobody recommends using a +/- 1g precision scale to weigh your dose. Dose changes of 1 or 2 grams produce easily measurable changes in flow. There is clear impact on taste in the cup (for me) with dose changes of 0.5g.


Yes a difference indeed, but I find that if I'm dialed in, (for most beans) +/- 1 gram gets me in the ballpark of similar (not identical) shots and reasonably close to what I'm aiming for. Usually they are all good tasting shots, though I agree a discernible difference could be tasted as a straight shot. Also flow is quite similar with this variation with maybe a couple seconds longer or shorter. I'll admit, the shots that I allow this much variation on are headed for cappuccinos so high precision isn't quite as important. I'll even mention that I rarely even allow this variation for milk drinks since I check the weight on the scale and it is easy to bump the grinder to top it off into the +/-0.5 range. Straight shots I'm always making sure I've got at worst +/- 0.2. Of course I cannot eyeball this! I grind aiming low, depending on how much more I need, I bump or sweep or both. I like to clear the chute anyway if I won't be making another espresso for some time. This method of measuring after grinding with a quick doser sweep is how I would propose to potentially deal with static in my routine. I feel that sweeping out a doser is a more natural routine, but again, I've never been fed up with static problems to be pushed to the point of trying anything to fix it. Maybe even putting a humidifier in the kitchen would be something I'd consider.

I'm still very curious if anyone knows what their local cafes are doing to cope with static. I wonder if they are even controlling the climate in the cafe? Maybe someone with static issues with a local bean can ask the barista the next time they are in the shop?
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Postby RapidCoffee on Sun Dec 23, 2012 12:40 pm

jonny wrote:I find that if I'm dialed in, (for most beans) +/- 1 gram gets me in the ballpark of similar (not identical) shots and reasonably close to what I'm aiming for.

We may have to agree to disagree on this. Going from 14g to 16g doses on my gear, there are dramatic differences in both flow rate and taste. This is hardly a subtle phenomenon. IMHO, that 2g range (15g +/- 1g) is essentially the entire practical dose variation for the 53mm Spaz double basket.
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Postby jonny on Sun Dec 23, 2012 2:15 pm

Maybe I should say +/- 0.5 grams then, haha. I was implying more that if I'm aiming for 18 grams, which is usually my starting point, a 17 gram dose will usually still taste good with a slightly faster but still reasonable flow as the 18 gram dose. And on the other end a 19 gram dose usually still tastes good with a slightly slower but still reasonable flow. Of course comparing both extremes is a very noticeable difference and for a fickle bean, it can be the difference between a good shot and a sink shot. Let me emphasize again, though: I rarely allow this much variation and if I do, it's in a milk drink. I almost always dose within a few tenths of a gram as should everyone for consistency, especially when making straight shots. If this still isn't agreeable to you, yes, I'll agree to disagree, but I feel like we agree on the basics but maybe just not quite on the same page? Maybe even same page, just different paragraph?

To keep this on topic: How much coffee can get "lost" (in the grinder/doser) when static is an issue and you haven't done anything extra like more than sweeping out the throat or RDT? I'm sure it's at least a gram, probably more, right? Definitely enough to destroy the shot if not adjusted, and if adjusted, enough to waste a good amount of coffee, no?
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Postby RapidCoffee on Sun Dec 23, 2012 2:50 pm

jonny wrote:I feel like we agree on the basics but maybe just not quite on the same page? Maybe even same page, just different paragraph?

Nope. But if you're happy with your dosing practices, that's cool. Enough thread drift, in any event. :)
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Postby mariobarba on Sun Dec 23, 2012 7:25 pm

Anyone try this technique with a full hopper? I wouldn't want to wet beans that aren't being ground immediately afterward. Anyone think of a workaround? Only reason I ask is that I just bought a bag of Fantini Extra bar (because it was cheap, 20$/kilo and came with a set of 50th anniversary espresso cups) that I am guessing has a high percentage of robusta since even with an OE dosing funnel I end up with grounds all over my counter
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Postby Spitz.me on Sun Dec 23, 2012 7:31 pm

You must RDT the beans you're grinding.
I know I've pulled a great shot when the flavour is 'like a beany taste that tastes like a bean'.
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Postby erik82 on Wed Dec 26, 2012 3:46 am

Started using the Malabar yesterday and RDT didn't work with the Mini. The Malabar needs a very fine grind which the Mini is just capable of. When running the Mini this fine can cause it too choke which happened 2 times already without RDT. Using RDT only made this happen faster. I could see static was less when turning it coarser to stop the choking but doesn't work with this grinder. I lend it from a colleague so won't try again. I'll give it another go when I recieve the HG One.
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Postby jedovaty on Wed Dec 26, 2012 11:54 pm

mariobarba wrote:Anyone try this technique with a full hopper? I wouldn't want to wet beans that aren't being ground immediately afterward. Anyone think of a workaround? Only reason I ask is that I just bought a bag of Fantini Extra bar (because it was cheap, 20$/kilo and came with a set of 50th anniversary espresso cups) that I am guessing has a high percentage of robusta since even with an OE dosing funnel I end up with grounds all over my counter


Maybe try to jab a pipette or dropper into the hopper where you know beans will be ground, then release a few drops, and remove? If that works, perhaps "mod" your hopper by drilling a hole in the side and feed the dropper through that... kind of extreme though.

Edit: in retrospect, good idea by TomC, don't try to mod expensive grinders.. :oops:
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Postby TomC on Thu Dec 27, 2012 1:31 pm

I would not drill a hole in any part of a grinder to facilitate this.
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Postby FotonDrv on Fri Dec 28, 2012 2:12 pm

Italyhound wrote:Perhaps I should substitute a drop of melted butter for the popcorning Versalab? 8)


Not so sure about the Butter Effect, but the VL does seem to benefit from the RDT.
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