DavecUK There just seems to be something about these Chinese variable speed brushless systems, they do seem to have stalling issues.
Agree, the pattern of stalling is well established at lower RPM and yes, there and there is a need to hot start.
I’m running light beans through the DF64V at the moment but at 1,000RPM and hot starting of course. Three days in and no issues at all. I’ll try 600RPM and see what happens.
(Personally I have no issue with hot starting or cold starting, but the manufacturer needs to be upfront and explicit about these limitations or requirments)
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?
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
prezes 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!
It’s on my list of comparisions for sure.
I also want to blind taste compare 64mm verus 83mm burrs, starting with SSP Espresso (HU)
(Just received an email to say that my DF83V (and DF54) are being shipped this week.)
So Niche has been back since Saturday. In my opinion the shots are less fruity and offer less clarity but are very well rounded.
I’d love to be able to keep both as I am impressed with df83v and had no issues with it but as can’t do that and original intention was to play about with it I will be selling it on.
How are owners finding the adjustability? Early days yet, but after 3kg of seasoning, I’m finding that a one digit change in the dial results in quite a big change in the flow rate. Unlike the DF64V and DF64 Gen 2 or the Duo. It either needs more seasoning or the thread pitch is not fine enough.
