As mentioned last week I’ve been making notes so see below.
Purposely didn’t adjust grind size if shots run too fast or too slow without trying both hot/cold starts first, unless it was way out.
Mainy used 600 rpm except few as highlighted, 8 sec 2 bar preinfusion followed by declining profile 9-8-7-6 bar for all shots. Normacore tamper, for double shots, to take one variable out. One spray of water.
Had two attempts at 400rpm.
No stalling to report.
List isn’t chronological as have been changing coffees daily/morning evening but kept notes against each particular coffee.
One thing I noticed, comparing to Niche, is with most coffees I could maintain the ground setting between 7.5g & 15g VST baskets whereas on df83v it requires a notch finer grind for 7.5g basket.
When adjusting grind size by more than two levels there’s obviously some grounds left as the first shot is always slightly out compared to the following.
A lot of trial and testing is required to see what difference does each change of rpm make and what impact on flow, taste etc it’s got. This is a task for @tompoland grinder lab!
I am happy how the grinder performs to this point with results being consistent enough.
Do you need variable rpm or is it just a bonus when you fancy to play with it and/or you know what you doing ? I think this is for every person to assess on their own .
Video below using cold start 400rpm.
Volcanic Java Kopi Bayukidu 15.5%FC/14.6% loss. roast date 22/2/24
Setting 6
- cold start - 15.1g in - 15g out . 32.1g @ 44sec
- hot start - 15.3g in - 15.3g out. 33.5g @ 41 sec
- 800rpm - cold start - 15.2g in - 15.1g out. 34.8g @ 31 sec
- 800rpm - hot start - 15.5g in - 15.5g out. 36.5 @ 33 sec
- cold start - 7.7g in - 7.8g out. 16.7g @ 32sec
- Hot start - 7.7g in - 7.9g out. 17.1g @ 36 sec
- cold start - 7.5g in - 7.6g out. 17.1g @ 32 sec
- Hot start - 7.6g in - 7.6g out. 17.4g @ 33 sec
- 800rpm - Cold start - 7.7g in - 7.7g out. 16.3g @ 28 sec
- 800rpm - hot start - 7.6g in - 7.6g out. 16.7g @ 27 sec
Setting 7
- cold start - 15.1g in - 15g out. 34.2g @ 30 sec
- Hot start - 15.4g in - 15.3g out. 34.8 @ 33 sec
Kenya Samburu estate AA - 12.4%FC/15.2% loss. Roast date 20/2/24
Setting 9
- cold start - 7.6g in - 7.7g out. 16.5g @ 24sec
- hot start - 7.6g in - 7.5g out. 16.3g @ 25 sec
Setting 8
- cold start - 15.1g in - 15.2g out. 39.5g @ 38 sec
Iron & fire Colombian decaf roast date 12/2/24
Setting 8
Cold start - 7.7g in - 7.8g out. 16.4g @ 23 sec
Hot start - 7.6g in - 7.7g out. 15.6g @ 28 sec
El Salvador Finca Tapantugusto rfa- 12.8% FC/ 16.7% loss. Roast date 26/2/24
Setting 6
- cold start - 15.2g in - 15.2g out. 33.9g @ 60 sec
Setting 8 - cold start - 15.4g in - 15.3g out. 33.7g @ 40 sec
- Hot start - 15.3g in - 15.2g out. 33.4g @ 34 sec
- Cold start - 15.3g in - 15.2g out. 33g @ 35 sec
- Hot start - 15.2g in - 15.1g out. 33.6g @ 32 sec
- Cold start - 15.1g in - 15.1g out. 33.5g @ 34 sec
- Hot start - 15.2g in - 15.3g out. 32.8g @ 30 sec
- 400rpm - cold start - 15.2g in - 15.2g out. 35g @ 28 sec
- 400 rpm - hot start - 15.2g in - 15.2g out. 32.2g @ 27 sec
- Cold start - 7.6g in - 7.5g out. 17.2g @ 28 sec
- Hot start - 7.7g in - 7.7g out. 17.4g @ 27 sec
Colombia Superemo el botan - 13.8%fc/15.3% loss. Roast date 29/2/24
Setting 8
- Cold start - 15.3g in - 15.3g out. 40g @ 26 sec
Setting 6 - cold start - 7.6g in - 7.7g out. 16.8g @ 32 sec
- Hot start - 7.7g in - 7.8g out. 17.4g @ 29 sec
mailto:kafar@btinternet.com
