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Thread: Creating a bottomless portafilter

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    Creating a bottomless portafilter

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Created a naked portafilter - WOW! the pour is extraordinary, will put up a video as soon as i have a spare moment.

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    Re: Creating a bottomless portafilter

    Quote Originally Posted by 282E233A222E364F0 link=1301662443/23#23 date=1304379947
    Created a naked portafilter - WOW! the pour is extraordinary, will put up a video as soon as i have a spare moment.
    I have been meaning to convert one of my spares too. Did you just use a hole saw then polish it or get someone to take it out on a mill?

    Cool toy too but I prefer the open springs on my groups 8-)

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    Re: Creating a bottomless portafilter

    Hey BF, I recently did the naked Conversion. See my post in my azkoyen bravo thread (extreme machines) for details

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    Re: Creating a bottomless portafilter

    Quote Originally Posted by 7077737C747E6B7B7C75120 link=1301662443/24#24 date=1304820997
    Did you just use a hole saw then polish it or get someone to take it out on a mill?
    I actually did it carefully with an angle grinder! You cant see any difference except when the portafilter is off and you turn it upside down, otherwise you would be none the wiser as to whether it was a home mod or a manufactured part.

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    Re: Creating a bottomless portafilter

    thanks guys, I have a tame mill and lathe owner around the corner and I have a pedestal drill with a good vice and a dremel mini grinder to tidy it up. I think I will bash my own based on the pics. :)

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    Re: Creating a bottomless portafilter

    Quote Originally Posted by 6166626D656F7A6A6D64030 link=1301662443/27#27 date=1304842139
    thanks guys, I have a tame mill and lathe owner around the corner and I have a pedestal drill with a good vice and a dremel mini grinder to tidy it up. I think I will bash my own based on the pics.* :)
    That sounds fine BF, with that gear you will be able to do it easily and as I say no one will ever be the wiser just from looking at it in place.

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    Super Moderator Javaphile's Avatar
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    Re: Creating a bottomless portafilter

    Id been meaning to knock up a bottomless for my La Cimbali M28 for some time now and after getting a bunch of new portafilters a bit ago I was ready to sacrifice one of my older ones and this thread finally pushed me over the line. So I loaded up the 2" hole saw into the drill press and locked one of the older portafilters into its vice and drilled away after setting the press for the slowest speed its capable of. With only a light amount of pressure the general purpose hole saw cut right through the 6mm thick brass so easily I didnt even bother to use any cutting fluid/lubricant. My Dremel quickly cleaned up the edges and after a thorough cleaning the now bottomless portafilter was ready to go.

    All-in-all a very easy mod. Unfortunately though the first pull with it will have to wait until after I get some shuteye as Ive been up all night and its now 6:15 in the morning here and time to go to bed! ::) :D

    Seeing as weve gone so far OT from the OP I split this off and put it here in its own thread.


    Java "Now Naked! :o" phile

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    Re: Creating a bottomless portafilter

    Quote Originally Posted by 6C6A677E666A720B0 link=1304379949/0#0 date=1304379947
    Created a naked portafilter - WOW! the pour is extraordinary, will put up a video as soon as i have a spare moment.
    Gday galumay. I am using my Pompeii pretty much exclusively with a naked as well. Its the only machine where I do this because the pours are so beautiful to watch and the results are in the cup.

    Your 2 hole steam tip and DVD are in an express post bag heading north. Hopefully you should have them in a few weeks!* ;D

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    Re: Creating a bottomless portafilter

    Anyone know anyone who could machine mine for me - Silvia PF - and Im just near St Kilda Road, Melb.

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    Re: Creating a bottomless portafilter

    Well the new bottomless worked a treat. The mouthfeel and flavor of the coffee has definitely changed. And its fun to watch the pour too! :)

    I tried to take a video of a pour but all I have available at the moment is an older VGA res phone and it did not turn out too good so yall will have to wait until a friend with a better phone comes over and Ill take a vid then. :)


    Java "Scaring the neighbors!" phile

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    Re: Creating a bottomless portafilter

    Finally got naked, slowest speed on the drill with a touch of oil to help cutting. Tidy up with the Dremel and a little wet and dry. I need to go and buy a different sized saw to do my spare on the Izzo (55mm) now.

    really bad phone camera shots in bad light too.




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    Re: Creating a bottomless portafilter

    Nice - my cousin has had my PF for a year now! How hard is it to machine one - geez! ::)

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    Re: Creating a bottomless portafilter

    Quote Originally Posted by 7366746F6E62070 link=1304379949/11#11 date=1305528435
    my cousin has had my PF for a year now! How hard is it to machine one - geez!
    Getting around to it can take a while, but the process itself only takes minutes.


    Java "Ill try to snap a pour from it tomorrow." phile




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    Re: Creating a bottomless portafilter

    Quote Originally Posted by 2E3B2932333F5A0 link=1304379949/11#11 date=1305528435
    Nice - my cousin has had my PF for a year now! How hard is it to machine one - geez!
    I have been going to make one for over a year for the Izzo and as it sleeps in the shed where the drill is which is in the same place I work 6 or 7 days a week. All good things take time is the only excuse ;)

    I really now need to add a silicon mat to my bench to use the naked but apart from that an easy job 30-40 minutes and the pours look and taste great. Really love the tiger stripes 8-)

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    Re: Creating a bottomless portafilter

    looks like you have had some errant spurts of coffee on the side of the cup there beanflying. Thats one of the reasons I put my bottomless away, the spouts are so much cleaner

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    Re: Creating a bottomless portafilter

    Quote Originally Posted by 6761767D6760787A130 link=1304379949/14#14 date=1305699102
    looks like you have had some errant spurts of coffee on the side of the cup there beanflying. Thats one of the reasons I put my bottomless away, the spouts are so much cleaner
    The whole idea of the naked portafilter is you are able to see your extraction and then avoid spurts by getting your technique right!

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    Re: Creating a bottomless portafilter

    Yep and that is why I have one.

    Has it improved my dosing and tamping, yep, I think it has. Is my espresso machine and surrounds cleaner for putting it away, definitely ;D

    I still get it out every now and then to check my technique but IMHO one tiny spurt wont make much difference to the shot quality, sometimes you dont even see them, just the resulting messy chrome.

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    Re: Creating a bottomless portafilter

    Java - there seems to be still a decent sized rim around yours, did you keep filing the edges or does the basket fit in there?

    Quote Originally Posted by 6364606F676D78686F66010 link=1304379949/13#13 date=1305532066
    I really now need to add a silicon mat to my bench to use the naked
    I can see the down side would mean that youd have to be extra careful not to get grinds onto the PF.

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    Re: Creating a bottomless portafilter

    Quote Originally Posted by 445143585955300 link=1304379949/17#17 date=1305727009
    there seems to be still a decent sized rim around yours, did you keep filing the edges or does the basket fit in there?
    If you check the bottom of your basket the holes dont go all the way to the edge so as long as they holes in the basket are clear of the hole in the bottom of the portafilter you will be fine.

    I have a small wooden board that I use to tamp with and thats perfect for resting the end of the portafilter on when I tamp, you could use the edge of the bench as well.

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    Re: Creating a bottomless portafilter

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    Quote Originally Posted by 1702100B0A06630 link=1304379949/17#17 date=1305727009
    Java - there seems to be still a decent sized rim around yours, did you keep filing the edges or does the basket fit in there?*
    Quote Originally Posted by 787E6962787F67650C0 link=1304379949/18#18 date=1305761836
    If you check the bottom of your basket the holes dont go all the way to the edge so as long as they holes in the basket are clear of the hole in the bottom of the portafilter you will be fine.
    The only additional work I did on the portafilter was to clean up the edges and polish up the cut area a bit with my Dremel.

    As you can kinda see in the (Admittedly pour quality.) pic attached there is quite a bit of space between the side of the basket and the side of the portafilter. Plus as Trentski stated the holes dont go all the way to the sides of the basket. The hole is slightly larger than the holed area on the basket and the pour doesnt touch the portafilter at all. I would assume it would be even less of a problem with the baskets that others use. The one in this shot is one of my monster 28g baskets which barely fits into the portafilter.

    Leaving more of the portafilter intact give a larger heat sink for better heat retention as well as better integral strength. This is not a problem with the Cimbali portafilters as theyre so heavily built but other brands arent so thick and sturdy.

    Plus a 2" hole saw was all I had available when the whim hit me to do it. ;D


    Java "Enjoying the nekkidness of it all" phile




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