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24 May 2010
Author: Giorgos Lazaridis
Instant Cold Coffee Machine




Worklog - Improving the mixer rising-lowering mechanism (June 23 2010)

In the third page i presented the mixer mechanism along with the rising-lowering system. That was incomplete though, as the limit switches (high and low) were missing. I also decided to make a linear encoder to have an approximate position monitoring of the mixer. So, first the linear encoder. A ready-made linear encoder costs a lot to get. After all, they usually come with a high precision of some tenths of a millimeter, something that i do not need. So i made one myself, with an unused spare part from a CNC (a Balluff metal detector) and some screws:


I drilled a hole for the sensor to fit in First i put a pencil inside and moved the mechanism all the way side to side This way i had a straight line drawn on the base wood, directly at the center of the sensor hole
I used the caliper to mark equal spaces around 10mm each These are the marks. In each mark, i drilled a screw.


The first half of the encoder is ready. Now i had to fix the sensor inside the hole. The sensor will send a pulse each time that it is close to a metal (like the screws).


This is the sensor that i am about to use for the linear encoder I put it inside the hole. The sensor has a sensitivity range max 1.5mm. So the distance from the screws is critical. Not too big as it will not work, not too small as it will crash. This is the final assemble. I did not use the connector of the sensor as i did not have one right now. So i soldered 3 wires (+ - and signal)




The hardware limit switches!

Each CNC axis has two means of overrun protection: the software limit switch and the hardware limit switch. The first one is -as named- controlled by software. In my example, i know that from top to bottom i have 17 screws, so i expect 17 pulses to arrive. During the rising operation for example, when the controller reads 17 pulses, it will stop the motor as the head is at the top. But what if this procedure fails for any reason? Then the hardware limits will save the day. The hardware limit switches is -as named- hardware switches placed at the two sides of a shaft. They are usually located a little bit further than the software limit switch, and they control the power of the motor directly, not through the controller. If any of this switch is actuated, the power of the motor is immediately cut-off because it means that the head is about to go out...


I will use 2 L metallic pieces From which i shortened one side I screwed one on each side of the mixer wagon, about 3mm distance from the base This is how it looks with both L profiles screwed
I had once ripped some switches from a pinball game... Very useful items I removed from both the metallic extension. With the wagon about 5mm from the top side, i fixed the first switch... ...and the other switch at the opposite side with the wagon about 5mm from the bottom. When the wagon is about 5mm from a limit position, the switches will cut off the motor power supply (NC contact) and will inform the controller (NO contact)



















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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
      Amir

  • 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.

      Congratulations!


      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.

      --George

  • 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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