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Just jumping back to Rolleys rust issue (which I have been reading with interest).......The fact that both the side and the separate warming tray plate (made of different metals, and possibly in different factories!) are effected would indicate strongly that the cause was with the cleaning of the unit, or some other environmental factor at the consumers end.
Rolley, it is good to hear you received a replacement. Please let us all know if the problem returns with your new unit (fingers Xed it doesnt), or if you think of anything else that could have caused the initial problem. Naturally, we would all love to know how to avoid this happening to our own machines as well!
I have just spoken to someone scientifically minded, it seems that chlorine is the likely culprit in this case. So, any cleaning product containing chlorine (i.e. bathroom & floor cleaners as well as bleach) can cause stainless steal to rust.
Depending the grade of the SS, will depend on how quickly this will happen.
Apparently, all that is needed is a wipe from a cloth containing chlorine (which will quickly dry), and slowly and surely the exposure to air and moisture (humidity) will eat away at the surface.
Wow, that is CRAZY! But really interesting and good to know. Thanks for that. I might put a sign up above the machine, JUST IN CASE!!
I will definately let yas know how we go.. but the new machine actually sounds slightly different as well, so Im wondering if the other one had a bit more wrong.. The pump seems quieter with the new one.. weird i know.. Anyway.
Ta
Rolley
Originally posted by Rolley link=1172992656/75#78 date=1174557725
.. but the new machine actually sounds slightly different as well, so Im wondering if the other one had a bit more wrong.. The pump seems quieter with the new one.. weird i know.. Anyway.
Ta
Rolley
I think there has been a couple of production runs of the 6910 now. I also had an issue (not rust!!) with my 6910, and subsequently had it replaced. I also found the pump noise on the replacement was much quieter (or at least more muffled) than the first one. The 2nd one also came with a commercial sized milk jug, which was a handy addition over the little 600ml one I first got!
Little by comparrison, not little from a functional perspective. The big one now ships standard, so there must have been some feedback that customers wanted a larger jug!
You need a 10L just so you can marvel at its steaming power.
Re: bleach - corrosive on SS. If you leave a drop of bleach on a SS benchtop overnight, you will come back in the morning to find a discoloured spot, where the bleach has eaten into the SS. This is with 6% bleach.
Originally posted by Thundergod link=1172992656/75#82 date=1174564752
Why would you need larger than 600ml?
When making 3 or more milk based drinks in a single hit? I did this only yesterday, and the big jug was perfect!!
Originally posted by nunu link=1172992656/75#83 date=1174566365
You need a 10L just so you can marvel at its steaming power.
Re: bleach - corrosive on SS. If you leave a drop of bleach on a SS benchtop overnight, you will come back in the morning to find a discoloured spot, where the bleach has eaten into the SS. This is with 6% bleach.
Yep, sounds like nasty stuff as far as SS is concerned. Particularly so if consider that it continues to eat away whilst dry, so presumabaly you wont notice until its too late! Do any metallurgist subscribe to these forums?!
Nope, but Ive studied materials engineering and a helluva lot about the different modes of corrosion, causes, ramifications engineering and economic wise, rectifications and preventions.
Did you know corrosion costs Australia approximately over $10 billion annually? Maybe I should move in to the materials side of mechanical engineering...thats where the money is!
Just regurgitating what I learnt in 2nd level materials. Something like over 2% of Australias annual GDP.
As for a big jug...anything over 600mL in capacity.
At work, we go through 100+ kilos of coffee a week (thats A LOT OF MILK) and we only use 600mL and 300mL jugs. The best coffee houses will grind per shot and steam fresh milk in the appropriately sized jug. At one of the cafes I work at, I admit the robur dosing chambers are full during rush hour, but is usually fully used up in less than 10 minutes (from bottom to top of dosing chamber). But I tend to regulate how much is in the doser during rush hour, too keep stale coffee at bay.
I suppose when Im making more than two milk based drinks around my house I tend to end up with one wanting a lactose free, another wanting skim and another wanting full cream.
Ive switched to lite as I said previously, so everyone asking for skim now gets that and so do the full cream drinkers.
I have been a full cream milk drinker all my life; my mother used to make me drink a bottle a day as far back as I can remember; when we moved to Sydney the milk tasted watery to me as I was used to the real stuff in the country.
But even I have relented and now drink the lite. So if I can they can (even if they dont know it).
When I worked at that cafe for a few days, I had to use their own dubious practices; one being using 1 litre jugs and continually topping them up.
The place was slow and it would be a 50/50 split between single and multiple coffee orders, so the jugs were really too big for the orders coming through.
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