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24 May 2010
Author: Giorgos Lazaridis
Instant Cold Coffee Machine

Worklog - Remaking the revolver (June 9 2010)

Unfortunately, the first revolver did not work. The idea was good, the implementation suffered. The lack of precision caused the whole thing to collapse after some tests. So i had to re-make the revolver with better materials and better precision. Regarding the materials, the only change i made was a smaller in diameter revolver chamber aluminum tube. This would cause the straws to be more vertical when they go down the chamber. As far as the precision is concerned, i managed a 0.2mm precision! How? Well, the answer is a CNC machine. I went to a customer of mine named Polidorou. He owns a high end CNC for wood processing. Here are some photos from the whole process:

This is the machine (half of it) Ant the CAD/CAM software. Here i program the pieces These are the pieces ready with astonishing precision! The owner of the machine. Thanks Christara!

I then cut the new (and smaller in diameter aluminum tubes) with a saw again in the company of Mr. Polidorou. The assemble of the revolver looks perfect now! The whole construction is rigid and the tubes are firmly placed in position.

I decided NOT to make a commutator as before. I will test the vibrator fixed on the housing. This way, the revolver will be simpler. Mechanics loves simplicity because it works. The vibrator is strong enough, and hopefully it will shake the whole group. Then, i did 2 holes on the revolver plates and i used 2 long screws to fix it all together. I have oder blind nuts for the top side because now it looks awful. On the bottom side, i routed pockets for the nuts so they do not go over the plane of this side. I cut narrow self-stick air-block tapes and sticked them at the perimeter of the two revolver pieces. These pieces are about 4mm smaller in diameter from the straw tank diameter which they are supposed to fit in. The air-stop will act as a bush-bearing... or something. Also, the scary noise from the vibrator will be eliminated.

I made 2 holes on each revolver plate for the screws to go thorugh Two pockets will "hide" the nuts inside the bottom piece of the revolver The aero-stop will act as a bush-bearing and as a noise shield

Time for the sensors

The sensors are basically mounted on the base of the revolver. This is the 3rd piece with the single hole. First of all, the straw sensor. This sensor checks if there is a straw on the chamber ready to be sent to the coffee glass. I routed 2 pockets one opposite the other, at the perimeter of the straw hole. One pocket is for the LED, and the other for the photo resistor. The circuit that i used for the sensor is the Light / Dark Activated Relay, the third circuit (with the 741). Of course i do not use the relay! The transistor output is sent directly to the PIC. First i tried an SMD blue LED. Ridiculously, it did not work! The blue light penetrated the straws! Unbelievable. I changed then the LED with a normal red 3mm (i had no SMD red LED). It works perfectly.

I did 2 pockets at the perimeter of the hole At first, i used a blue SMD LED. Ridiculously, the blue light penetrated the straws unaffected! I changed it with a red 3mm LED With hot glue, i glued the LED opposite the large photoresistor. Whenever a straw goes through the hole, the beam is cut!

Next, the alignment sensor. For this sensor, i drilled one 2mm hole at the base, near the edge (perimeter), not too close though. I also made a pocket for the small photo-resistor. Then, i made 4 2mm holes at the bottom piece of the revolver in a way that, when one chamber is aligned with the base hole, one 2mm hole of the bottom piece will be aligned with the base hole! The, i drilled the tube that the revolver goes inside and i planted an LED inside. When the holes are aligned, the LED light will go though the 2mm holes directly on the surface of the photo-resistor and voila! I used the same Light / Dark Activated Relay circuit for this sensor as well.

This is the hole with the pocket for the small photo-resistor And these are the holes on the bottom revolver piece. I also sticked an opaque black film to cut parasitic light rays The holes are aligned! I drilled the tube that the revolver goes in and planted the light-transmitter LED from the sensor pair.

The revolver and the sensors are now completed. I used the same technique as before to fix the motor on the revolver, but i spent more time and i did a professional job. It was just about time for the.... stinger!!!!



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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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