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Bitter is caused by a few things.
Roast level eg dark roast
machine running hot
slow shots
Your palate
Dirty machine (needing backflust)
Dull grinder burrs
id day yours are on slow side but not drastically
What dose are you using?
I've tried a couple of coffee beans and I am able to try in another machine - where I know its not bitter so..
I could:
Roast level eg dark roast - Checked and Ok
machine running hot - decrease pressurestat ?
slow shots- coarser grind
Your palate- new tongue and mouth
Dirty machine (needing backflust)- clean machine
Dull grinder burrs- sharpened burrs - this shouldn't be an issue as I had this checked about 12 months ago and I would only put through about 10 kgs per year
Sounds right, get a new tongue and mouth transplant. Probably cheaper on the black market too
Oh and you don’t sharpen burrs, you get new ones.
Backflush the machine to make sure it’s clean and make the shots a bit faster (coarser grind)
Without being there it’s about all that can be suggested. Test and try really
Good luck
"Oh and you don’t sharpen burrs, you get new ones."
Sharpening burrs? something I've been meaning to investigate.
In my distant past I used dreadnought rasps as well as farriers rasps, when they lost their edge we had them sharpened chemically, this could be done a number of times, whilst they were not quite a good as a new rasp the process certainly extended their useful life and was a real money saver.
The burrs on a coffee grinder are very similar to the rasps I mentioned, there should be no reason why they cant be sharpened in the same way.
I've done a quick search and it seems like the process can be carried out using citric acid.
I'm just about ready for a burr change on the Mazzer, may well give the process a try, certainly nothing to lose.🙂
I have a feeling that Citric Acid wouldn't take a lot of material off the face of the burrs, I use it a lot in "water purifier" construction and it really only removes oxides even on steel in my experience.
It'd clean them really well, but I doubt it would sharpen much
Phosphoric or Muriatic acid may be a better bet imho
if you're a homebrewer, some undiluted Starsan or Stellarsan should do the job
As an Engineer, I disagree with the value of sharpening burrs. If we are chasing uniformity and consistency, and spending thousands on machines and beans, it makes no sense to spend as much to do a half job of self sharpening as to buy new production made burrs. Just my 2c
I have a Vibiemme (Super Manual) and have finally , (with assistance from Ronin ), got it pouring great shots.
Now I notice there is a bit of condensation in both of the gauges and the glasses on top get moist.
Opened it up and I think the anti vacuum valve need to be replaced or could it be the boiler safety valve ?
I have noticed that when pouring a shot - the pressure will sometime drop and the pump will start to operate - not sure why this happens - any ideas?
I have recently ( about 3 months ago ) rebuilt most of this machine - replaced most of the seals , pulled the boiler out and cleaned, replaced element, new controller.
Only things I didn't replace were the micro switches and the water level probe.
HI All,
I have a Vibiemme (Super Manual)
I have noticed that when pouring a shot - the pressure will sometime drop and the pump will start to operate - not sure why this happens - any ideas?
I have recently ( about 3 months ago ) rebuilt most of this machine - replaced most of the seals , pulled the boiler out and cleaned, replaced element, new controller.
Only things I didn't replace were the micro switches and the water level probe.
Any ideas??
Thanks Coffeed2
You mean as in when steaming milk - pump will kick in?
Is it rotary or vibe ?
BTW How did the transplant end up ? Doc did as good job ?
When you are pouring a shot the pump starts running as soon as you raise the lever??
Also it would be unlikely that the safety valve is leaking as the only usually do in over pressure situation 1.7 or 2 bar to save the boiler from exploding. The anti-valve being faulty or stuck would explain moisture and lack of steam power. You can try a couple of things, grab a plastic or wooden spoon and give it some decent presses and purge some steam to see if you can clear any debri (don't burn yourself). Remove the anit-vac valve when the machine is cool and give it a physical clean and/or chuck it in descaler for a few hours.
If you mean the pump stalls part way through a shot then either the pump is a dud (there are a few that are not bench tested and can fail out of the factory) or maybe you a problem with your OPV valve.
If you mean the pump stalls part way through a shot then either the pump is a dud (there are a few that are not bench tested and can fail out of the factory) or maybe you a problem with your OPV valve.
Can ad to Ben's list....Or MicroSwitch is faulty or needs re-adjustment to match the activating 'cam' on the lever.
So Did the Wife like/agree with the Surgeons' handywork ?
PS MAybe Coffeed2 means there is a rise in decibles / noise / pitch or tone during the shot ?
Is it a woop wwoop wwwoooooppp type sound Coffeed2? high pitch metallic sound?
Re the water level sensor, they are pretty basic but can get blocked with scale. Again you can just physically clean or throw in some descaler for a few hours. They are just a stainless steel rod with a plastic sleeve and a male spade terminal connector on top.
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