Niche Zero: grind size mysteriously got much much finer
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I've had my Niche Zero for 3 months now and everything had been working smoothly and as expected. Then recently over the weekend, I ground the same beans and the extraction completely clogged up my espresso machine. I increased the Niche's grind setting another 6 notches (i.e. ground much coarser in relative terms) to get a similar extraction time as before (say 18g in, 36g out in 27 s roughly), so the problem isn't the espresso machine. I opened up the grinder several times, cleaned, calibration never changed, reassembled, the mysterious +6 offset was still there several coffees later: all these coffees extracted as consistently as before.
When I had the burrs removed, I noticed that the triple sweep arm at the bottom was raised from the grind chamber floor by a business card's thickness, fractions of a millimeter. I could've sworn the sweep arms are supposed to sit flush, but I never paid close attention before and I don't remember for sure. It's like the motor shaft or something near there (bearing assembly?) suddenly shifted up, pushed the sweep arms up, which then moved the lower burr closer to the top burr. I didn't see any grounds or debris in the motor shaft area that would force the sweep arms to sit higher suddenly. The motor shaft seems tight in all directions.
Could someone confirm whether their Niche's sweep arms sit flush on the grind chamber floor and makes contact? It makes sense that they would to achieve little to no retention. If this is true, then I am not sure what happened.
When I had the burrs removed, I noticed that the triple sweep arm at the bottom was raised from the grind chamber floor by a business card's thickness, fractions of a millimeter. I could've sworn the sweep arms are supposed to sit flush, but I never paid close attention before and I don't remember for sure. It's like the motor shaft or something near there (bearing assembly?) suddenly shifted up, pushed the sweep arms up, which then moved the lower burr closer to the top burr. I didn't see any grounds or debris in the motor shaft area that would force the sweep arms to sit higher suddenly. The motor shaft seems tight in all directions.
Could someone confirm whether their Niche's sweep arms sit flush on the grind chamber floor and makes contact? It makes sense that they would to achieve little to no retention. If this is true, then I am not sure what happened.
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- Posts: 76
- Joined: 9 years ago
This is interesting, I have the opposite happen to me.
I have one of the original Made in UK indegogo Niche Models.
I was usually grinding for espresso in the 15-18 mark, very consistent, never changed over the time I've had it. But all of a sudden I had the opposite issue, my grinds became very coarse. Now I grind at the 2-3 mark. Haven't touched the calibration (since I did it out of the box), nor have I ever opened up the grinder...
I have one of the original Made in UK indegogo Niche Models.
I was usually grinding for espresso in the 15-18 mark, very consistent, never changed over the time I've had it. But all of a sudden I had the opposite issue, my grinds became very coarse. Now I grind at the 2-3 mark. Haven't touched the calibration (since I did it out of the box), nor have I ever opened up the grinder...
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- Posts: 1833
- Joined: 7 years ago
What you're describing is different I believe. Quite a common thing with the NZ. You probably simply need to clean your Niche thoroughly and recalibrate. You'll likely be back close to your initial settings although with burrs seasoning, it's normal to expect some changes towards finer grind settings.
LMWDP #592
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- Posts: 76
- Joined: 9 years ago
Thanks! Just gave it a deep clean and settings are back to normal. Was pretty gross in there!
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- Posts: 14
- Joined: 8 years ago
My grind setting have changed twice only after deep cleaning. Started out of the box at setting 18 for 17g ~> 34g out in 28 seconds
1st cleaning after 1 month caused my setting to increase to 21 to keep same output and time.
2nd cleaning i'm now at 25.
I'm puzzled, but keep trying to figure out why.
1st cleaning after 1 month caused my setting to increase to 21 to keep same output and time.
2nd cleaning i'm now at 25.
I'm puzzled, but keep trying to figure out why.
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- Posts: 246
- Joined: 4 years ago
Good demonstration of why people hesitate to treat grind #s as universally applicable... My espresso, before and after clean/calibrate, is always less than 10 on NZ
"All people by nature desire to know" -Aristotle
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I think grind numbers will be consistent across NZ machines when the roast and bean are consistent.
I have been surprised at the need to tweak the grind for the same country of origin and same roast style from two different roasters. And "need" is relative - always reaching for the perfect cup.
I have been surprised at the need to tweak the grind for the same country of origin and same roast style from two different roasters. And "need" is relative - always reaching for the perfect cup.
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- Posts: 14
- Joined: 8 years ago
After about a week of the sudden grind size change, things returned back to normal. Having the only way grinds could get so fine without me physically adjusting the settings is that after my cleaning, the pieces settled back into place.GW2K wrote:My grind setting have changed twice only after deep cleaning. Started out of the box at setting 18 for 17g ~> 34g out in 28 seconds
1st cleaning after 1 month caused my setting to increase to 21 to keep same output and time.
2nd cleaning i'm now at 25.
I'm puzzled, but keep trying to figure out why.