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24 May 2010
Author: Giorgos Lazaridis
Instant Cold Coffee Machine

Worklog - The mixer group (May 27 2010)

I will begin with the easiest group. A small high speed 3V DC motor will rotate the mixer. Either by PWM or voltage regulation, i will control the speed of this motor. The motor must be able to move up-down about 220mm, considering that a tall coffee glass is about 190mm. This is what i am talking about:

The construction of the linear guide

I cut with a round hollow drill 4 pieces of thick plexi glass. The diameter of these plastic pieces -that are supposed to be used as spacers and covers, was about 2mm bigger than the plastic tube that are supposed to be entered. So, i fixed each plastic piece on a M5 screw-nut, i fixed this screw on the chock of the drill, and using a file i fixed the outside diameter to fit the tube. I did this for all 4 pieces. I filed one piece conical. This is supposed to be the front cover. The bigger diameter is exactly the same (and maybe 1 tenth bigger) than the internal diameter of the tube, so that this piece will stuck inside. The other pieces can be a little bit smaller.

With a hollow drill, i removed 4 round pieces from a plexi glass I fixed each piece on a screw-nut Using the drill and the file, i decreased the diameter of the pieces to fit in the tube I made one piece conical, so that it will stuck in the tube

Then i did some router work on the front and back piece:

I grooved the front piece... For the rubber cover to fit Then o grooved the back side of the wires and the back side of the motor. This is the final assemble, yet not fixed

It was time to fix the spacers with the motor:

I cleaned with a strong degrease fluid and i roughed the surfaces of the motor and the plastic pieces I covered with tape the exposed shaft of the motor Using very strong glue, i glued the pieces on the motor. Then i placed the construction inside a half-piece of the same tube that they are supposed to be. I put some more epoxy and let it dry. I then turned the assy to the other side and put some more epoxy and let dry.

I let this piece to dry for one day (24hours). Then i put it all together:

This is how the parts will be inserted in the tube. The tube is 240cm long I drilled 2 holes on the tube I soldered 2 wires on the motor for power supply
I pushed everything inside the tube. They fit perfectly! With the drill, i drilled 2 holes, one on the plastic piece that is fixed on the back side of the motor, and the other on the cap-piece. I put 2 screws to hold the entrails inside. The shaker assy is ready. Now i need to make the up-down mechanism

Going Up, Going down...

First of all, i need to make a linear guide where the mixer will move to:

I cut two pieces of plastic tube with internal diameter 12.5mm, and a piece of marine wood I drilled the tubes in 2 positions. The holes goes through all the tube. One hole is 5mm diameter and one is 3mm. I screwed the two pieces on each side of the wood.
Then i cut two long aluminum tubes with external diameter 12mm. These will be the guides. Two U aluminum profiles with holes will hold the aluminum tubes in position I fixed the guide base together with very long screws. It moves extremely smooth!

A car with one window less

It was just about time to make it happen! I will use the motor and a part of the mechanism from an old car electric window. The following assy is only a prototype. I did this ONLY for test. The final assy will be on a better piece of wood.

This is the mechanism from the car electric window. I removed the base and some other small parts. But the wire is too long I removed about 12cm of wire
I stripped the plastic from... this thing (i do not know the name) I used it to join the wire. It is very tough!!! Isn't it sweet? It works perfect!

The final group assy

After some hours of testing the guides and the motor for vibrations and poimts of high friction, i was ready to make the final assemble. I took a proper piece of wood cut to size. Then, i used a threaded spacer and a screw from the wire-clipping of an old power relay. This clipping is a wide-angled V shape of a very hard metal and is used to clip the wire. It has a hole on the center for the screw to go through, which i had to remove this screw. I cut it and replaced it with my M3 screw. Then, i fixed this screw in the 10mm threaded spacer. I also added a washer. Between the washer and the wire clip, i put the wire from the mechanism. This way, the threaded spacer is now fixed to the wire.

I took a nice 16mm board cut to size I used a wire-clip from an old power relay, a threaded 10mm spacer and a washer to make the wire hook I screwed the wire clip to the threaded spacer, and between this clip and a washer i had the wire from the up/down motor hooked. The spacer is now fixed to the wire

Then i drilled an 8mm hole to the center of the wagon (base of the mixer). The 10mm spacer is inserted firmly to this hole. The wagon wood is 16mm and the spacer 10mm. With another 3mm screw and a washer, i fixed the wagon onto the spacer. Now, when the wire moves up/down, the spacer will also move and the wagon is fixed to the spacer. Although i could use a tie-wrap or a piece of wire to fix the wagon onto the wire, that would be lame.

I drilled an 8mm hole at the center of the mixer wagon for the 10mm spacer to fit in I put the spacer into the hole and fixed it with a 3mm screw and a washer This is the final assy! The spacer is fixed on the wire and the wagon on the spacer. The motor moves the wire up/down.



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  • At 3 July 2015, 6:23:11 user Alex wrote:   [reply @ Alex]
    • Still watching this space every other month only to find the project still not being updated. Hoping to see some progress soon. :)

  • At 28 March 2014, 3:28:25 user Nikos wrote:   [reply @ Nikos]
    • re si, nomizo the "redux" version should have an optional milk stage too for those of us who prefer it a bit easier to drink :)

      subscribed on YT, keep up the good work!

  • At 18 January 2014, 7:31:43 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @Alex In Greece during the Ancient times there was this saying: "Oyden monimoteron ek toy prosorinoy" which means that "nothing is more permanent than the temporary".
      But now that you said that again, i think i should restart this project, shouldn't I? Hopefully within this year.

  • At 17 January 2014, 19:59:52 user Alex wrote:   [reply @ Alex]
    • Dude what happened with this project, there hasn't been any updates for quite some time now. Looking forward to see the end result :)

  • At 13 November 2013, 17:56:48 user Robert wrote:   [reply @ Robert]
    • This is a great invention! I especially like the straw delivery, it is perfect. how wonderfully useless! you are a genious!

  • At 16 September 2013, 15:38:37 user praveen wrote:   [reply @ praveen]
    • excellent job......

  • At 14 June 2013, 17:45:35 user Amir wrote:   [reply @ Amir]
    • Hi ,

      Great work . From where did you buy the worm gear extruder ? Can you give me a website for that .

      Many thanks

  • At 29 March 2012, 21:03:02 user alex wrote:   [reply @ alex]
    • Hi you have a nice coffee Instant Cold Coffee Machine but you wanted to use a fridge for cold water but no water cooler that you use waron also in coffee automaaten is where you can get I know old water out of if not the name but it can look for you we have that built-in devices greetings alex
      mail alex.heijkens@kpnmail.nl

  • At 6 March 2012, 10:25:13 user Giorgos Lazaridis wrote:   [reply @ Giorgos Lazaridis]
    • @steve salvaged from an old photo copier. it was used to push the toner

  • At 5 March 2012, 13:56:29 user steve wrote:   [reply @ steve]
    • Where did you found the worm gear for the sugar and coffee supply?And awesome project.Good Job

  • At 9 January 2012, 9:40:16 user qwerty wrote:   [reply @ qwerty]
    • Tromeri i frapediera sou.bravo sou

  • At 24 August 2011, 11:38:08 user a.mira@vmcogulf.com wrote:   [reply @ a.mira@vmcogulf.com]
    • niccccccce i like this machine :) did you manufacuter it ???

  • At 26 July 2011, 17:53:16 user Sergio wrote:   [reply @ Sergio]
    • Excelent Job! Very good videos an explanations.


      Segio from Argentina

  • At 24 May 2011, 15:00:24 user Kammenos wrote:   [reply @ Kammenos]
    • @Fung no of course not. i will have different programs for different sizes. there are 4 sizes of cups (in respect to the volume)

  • At 24 May 2011, 14:24:55 user Fung wrote:   [reply @ Fung]
    • Do the cups which being used are restricted to the same size and same volume? (ie other cups are not allowed?)

  • At 14 May 2011, 19:27:58 user Ivan wrote:   [reply @ Ivan]
    • Great work.....

  • At 27 April 2011, 4:54:19 user Kammenos wrote:   [reply @ Kammenos]
    • @Dimitris it was part of an old photo copier, used to push the toner.

  • At 26 April 2011, 20:23:01 user Dimitris wrote:   [reply @ Dimitris]
    • Congratulations man!
      Awesome machine!
      Can you tell me, where did you find the 'worm' thing
      for the dispenser mechanisms?

  • At 27 March 2011, 6:16:30 user Kammenos wrote:   [reply @ Kammenos]
    • Hello George. Regarding the elements, these are hardware wiring to indicate wire connections between the modules. The orange boxes indicate wires coming from the output module (Digital Output Module - DOM), and the green indicate wires going to the Digital Input Modules. Notice that for example, from module "Rotary table", 4 wires comes out, then 2 of them arrive from the DOM and 2 goes to the CPU.
      As far as the diode is concerned, this is only for polarity protection. It is the same as the D2. But you are right, It is not necessary and i may not put it after all.

  • At 27 March 2011, 5:57:10 user George Hadley wrote:   [reply @ George Hadley]
    • I think your architecture diagram (first figure) is slightly confusing, because it seems to include elements of code (the elements above the CPU) with hardware elements. Ideally, you would have a system-level block diagram detailing your hardware and a separate functional block diagram to describe your code. If I'm misreading your architecture diagram, feel free to ignore this.

      Secondly, looking at your reset circuitry, I see you have a 1N4148 diode between your microcontroller pin and your ICSP header (pin 1). I'm fairly certain this diode is not necessary, so you may want to double check that.


  • At 25 March 2011, 11:45:30 user Fung wrote:   [reply @ Fung]
    • Why does PIC16F1937 have 2 Vdd's and 2 Vss's?

  • At 12 March 2011, 16:40:13 user de.das.dude wrote:   [reply @ de.das.dude]
    • you are sooooo awesome!!!

      there are no words to describe your awesomeness!

      i hope i can be as awesome as you!

  • At 25 May 2010, 1:53:39 user Tom Hargrave wrote:   [reply @ Tom Hargrave]
    • Frappé has become very popular here in the States. The difference is we use fresh coffee grounds to make coffee then we chill the hot coffee. But we tend to make more fresh coffee here while Europeans tend to make more instant coffee.

      To serve we pour some in a glass and add chipped ice.

      We also tend to add flavors to our frappé in the States. We can't leave a good thing alone - we have to tinker with it to make it more sellable.

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