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Thread: 2 machines different milk foam.

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    2 machines different milk foam.

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hi, I have 2 sunbeam machines, a 6900 and a 6910, the 6900 has had the electronic circuit board upgraded to the 6910. both have been de-scaled and have the same steam settings. they sit side by side, the 6900 makes perfect micro foam and the 6910 makes rubbish. any ideas why.

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    Re: 2 machines different milk foam.

    Because no two machines are identical.

    In your case, either one machine is performing better than average, one is performing worse than average or both.

    It could be that the descale worked better on one than the other or that the tolerances of the electronic components are such that theres a performance difference or one steam pump is not as good as the other etc. etc. etc.

    In other words, "how longs a piece of string?"

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    Re: 2 machines different milk foam.

    The machine that is crap I bought brand new and I put up with the bad milk thinking I was just crap at frothing, the other machine I got found at the dump, took it home and repaired it, and it froths too much and I have to finish with the wand deep. maybe I just got a crappy machine from new.

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    A_M
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    Re: 2 machines different milk foam.

    The EM6900 does not use a steam OPV and used a modified steam tip to manage back pressure etc... It also has a copper liner in the steam thermoblock. This means with a EM6910 board you can get EXTRA HOT and better pump rates.

    The newer EM6910 use a steam pump with a OPV and if set wrong or bits of coffee dust it can be less than ideal (I block the OPV to ensure no pressure is lost and mod teh steam valve tip so it is like a EM6900).

    The EM6910 has SS liners in the thermoblocks so you need to set high in the temp and LET it warm up for longer..

    Yes a EM6900 may be ready for coffee in 10 ::) but an EM6910 should be sitting for at least 20 min to allow the Group and Steam block to FULL Y come up to temp ;)

    In addition it can be teh luck of teh draw :P but more offten than not there is a reason for it. The trick is to be able to find and understand why. Then you can work with it. ;)

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    Re: 2 machines different milk foam.

    Ah, now I understand why the 6900 doesnt shut off the steam fully when the valve is closed and the 6910 does, because it doesnt have an over pressure valve. Am I able to adjust the OPV and can you tell me how you modified the tip on the 6910, I might give that a go, or any other mods I can do to the 6910. I have the steam setting set at +4 temp and +4 pump.

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    A_M
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    Re: 2 machines different milk foam.

    Quote Originally Posted by 455542535317171713270 link=1298209212/4#4 date=1298506459
    Ah, now I understand why the 6900 doesnt shut off the steam fully when the valve is closed and the 6910 does, because it doesnt have an over pressure valve. Am I able to adjust the OPV and can you tell me how you modified the tip on the 6910, I might give that a go, or any other mods I can do to the 6910. I have the steam setting set at +4 temp and +4 pump.
    OPV is adjustable but I just Block it and then mod teh Steam valve tip.

    1: Look at your Steam valve tip on the 6900 and you will see what you have to do... Got a file ;)

    2: The opv is a black unit directly on top of teh pump. One leg goes up to the steam block the other goes off and joins into the waste. If it is looking dirty / dark grey smudges. Then a chance teh OPV is letting pressure out at some stage. A number of ways to block it, but if you do incorrectly you could have a leak and that is BAD in this area.

    I find it is best use a plug and seal the OPV outlet and still leave the tube on..

    If ya stuff it or the pump it is ONE part not two :D






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    Re: 2 machines different milk foam.

    ye ha, proper micro foam at last, thanks Angermanagement, I doubled over the pressure relief hose and cable tied, then filed the valve stem to relieve the pressure. seems to work well. re checked the steam settings +10 deg and .2sec rate. just finished a coffee with 10mm of micro foam at last, and a rosette to finish. thanks again. :)

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    A_M
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    Re: 2 machines different milk foam.

    Quote Originally Posted by 445443525216161612260 link=1298209212/6#6 date=1298551396
    ye ha, proper micro foam at last, thanks Angermanagement, I doubled over the pressure relief hose and cable tied, then filed the valve stem to relieve the pressure. seems to work well. re checked the steam settings +10 deg and .2sec rate. just finished a coffee with 10mm of micro foam at last, and a rosette to finish. thanks again. :)
    Thanks for the follow up...

    The issue with teh valve tip is that if not done heat and pressure will make their way around and cause issues for the pump. They are only rates at about 50C :o

    With the modified valve tip, the steam dies but not instantly and I find that it tends to keep the insides of teh tip a bit cleaner.. I let it bleed into the wast tray. A minor issue.

    As stated the EM6910 will take longer to get good heat into the system that the 6900 so a few extra min for heat up time is worth it all the way round.

    PS. If you have played with the group temp and you let it sit for longer, you may wish to knock the temp back ONE step... If you at the hottest.



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