DF83V (expect the unexpected)

prezes I didn’t have to slow feed even using light roast. I am using 600rpm at the moment so can’t comment on lower.

Does this include no longer needing to “hot start” e.g. feeding the beans in with the grinder running?

For the first three/four days I’ve not tried hot starting at all and had no issues with stalling etc.

this weekend I started doing it on an off to see if it makes any difference to the extraction but didn’t notice anything major.
I will make some notes on flow times hot starting and not over next few days and post an update.

DavecUK Not for some user.

giampiero this looks bad! I tend to grind 7.6 / 15 g but on initial setup done few lots of 40g at once cold starting at had no issues.

My zero point seems to be set very much like his and I’m currently grinding between 6-14 on the dial.

giampiero Not for some user.

There just seems to be something about these Chinese variable speed brushless systems, they do seem to have stalling issues. perhaps not all, or perhaps it’s for light roasted beans. I don’t know but too many reports about it now to not be a “thing”.

I have some suspicions as to what it might be and why some may start out not stalling then get worse and worse…

did see someone got one of these and they had grease on the burrs.

DavecUK The real differentiator between DF and Niche, Option O, Olympic, Zerno is that the DF stuff is first and foremost cheap. That is its principal virtue. I cannot conceive that anyone would purchase a DF instead of a P64 for example if they were the same price.

Since cheapness, not longevity nor reliability, is the chief design criteria, something must go. Otherwise it would cost as much as a P64. It is price versus quality.

DF83V is £799 in the UK

https://bellabarista.co.uk/products/copy-of-the-solo-df83-single-dose-grinder

BrendaninBrooklyn I don’t think that price tag is the reason🤭

giampiero I think of Weber as a sort of Yves St Laurent sports car, i.e, not well-engineered but designed to appeal to a certain type of consumer. The fact that it is so while being expensive has nothing to do with the quality trade-offs in DF products. Again, assuming same price, who would actually not buy the Option O, Zerno, etc?

£800 stuff that.

@tompoland that’s the one 😂 I’m not thinking copper slip 😂😂😂😂

I unexpected the expected and spontaneously combusted

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

Opened up to see what’s inside after roughly 1.2kg of coffee:

prezes that’s one hell of a tin foil shim…

Cuprajake I only needed one small layer lol