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Thread: Another DIY Rotary Film Processor

  1. #11
    Jac@stafford.net's Avatar
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    Re: Another DIY Rotary Film Processor

    Quote Originally Posted by Graham Patterson View Post
    I use a 6"/150mm woodworking bubble level. Takes only seconds to check. I move my Jobo when it is not in use, so a check is advisable.
    Ah, ya cheat. I use a digital level, too.
    .

  2. #12

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    Re: Another DIY Rotary Film Processor

    thanks for the tip on keeping the drum level.
    I hv put up the Arduino sketch (code) on my blog. Be warned that I am no coder. I pieced the code from various sample codes and modified it to suit my needs.

    http://sgwetplate.com/2016/11/arduin...ilm-processor/

  3. #13

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    Re: Another DIY Rotary Film Processor

    Why the one second pause between cycles? if your 4.5 second rotation step is exactly reproducible in reverse (same number and fractions of a drum rotation) you risk a 10% increased development zone. Since you do not pause between forward and reverse, there does not seem to be a mechanical need for a pause. Otherwise I would have expected the pause time to be split between the two directions.

    I am not saying you are wrong - I just want to understand why it is done this way, and if it has any effect in practice. My Jobos (a CPE and CPE+) both take a fraction of a second to reverse, and actually rotate a different number of rotations (the CPE is mechanically reversed and rotates less per cycle). There is also a slight drift between forward and back, so over a few minutes the tank progresses in one direction.

    You are actually inspiring me to get my Jobo timed start and temperature reporting application up and running. The Raspberry Pi has all the hardware - I need to finish the code so I can remote interrogate it from the main house.

  4. #14

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    Re: Another DIY Rotary Film Processor

    Ha good question. the part of the code was taken from another project I did earlier where there is a pause period before the motor reverse. So what I did was only to change the timings involved. I guess it can be easily change to remove the pause but I have not really run enough sheets through to see the impact of it.





    Sent from my Redmi Note 3 using Tapatalk

  5. #15

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    Re: Another DIY Rotary Film Processor

    I think I would ensure that the rotation is something over two revolutions per direction, up to maybe 5. On the other hand, many people get by happily with a uni-directional drive. The nice thing is you have complete control, and room to experiment.

  6. #16

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    Re: Another DIY Rotary Film Processor

    Quote Originally Posted by pound View Post
    I finally put this project together after moving on to shooting 8x20 and could not bear manually rotating the drum.
    Basiclaly it is made up of a roller base with 4 Rigid Wheels, a motorized arm with 2 wheels and a Arduino Uno box.
    More details on the parts and components at http://sgwetplate.com/2016/10/diy-ro...ilm-processor/

    The roller base with 4 Rigid wheels
    I connected the 2 pieces of plywood using 2 brass rails (they were from a forsaken camera project). They are locked down using 1/4" bolts and nuts. This will allow me to adjust the distance between the 2 rolls of wheels for catering to drums of different diameters. At this point the drum should rotate smoothly and evenly by hand.

    The motor and the shaft coupler
    For now I am using a 12V 30 rpm motor. To mount the 3/8" threaded rod (again another piece I have sitting around) , I use a flexible shaft coupler which has a one 6mm hole what will fit the motor shaft while the other end is a 10mm hole that fit the 3/8" rod.
    Hi Pound. I was really inspired by your project and made me want to build mine.
    Based on your project, and willing to process color C41 films, I wanted to couple it to a heated water bath.
    I already planned to recycle a old electric kettle to use the heater with an fish tank thermostat so this part would be easy.
    But, as I never used an Arduino in my life, I wanted to know if you'd like to share your wiring schema with us ? The code part seems pretty clear to me, but I cant catch how you wired the moto to the motor shield, then to the arduino (and the same for LCD to arduino).

    It has been a long time since you posted here, but I'll give it a chance

    (Excuse my english)

  7. #17

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    Re: Another DIY Rotary Film Processor

    Quote Originally Posted by pound View Post
    Thanks!
    The wheels has good contact with the drum. The drum tends to move forward(to the left as seen in the first photo) as it got rotated so I will have to get a barrier on the left to make sure it does not go too far off.
    Experienced that same very gradual movement of the drum. Fortunately it was always in the same direction, so I glued a piece of thin plastic to one of the insides of my darkroom sink. Place my Unicolor roller base with the JOBO drum's base a 1/4 of an inch away from the plastic. As it spins, the drum slowly creeps to be in contact with plastic which stops it from rolling off the Unicolor roller base. After dozens of time doing this, I have yet to see any wear on the bases of my JOBO drums.

  8. #18

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    Re: Another DIY Rotary Film Processor

    Quote Originally Posted by NerdLabs View Post
    Hi Pound. I was really inspired by your project and made me want to build mine.
    Based on your project, and willing to process color C41 films, I wanted to couple it to a heated water bath.
    I already planned to recycle a old electric kettle to use the heater with an fish tank thermostat so this part would be easy.
    But, as I never used an Arduino in my life, I wanted to know if you'd like to share your wiring schema with us ? The code part seems pretty clear to me, but I cant catch how you wired the moto to the motor shield, then to the arduino (and the same for LCD to arduino).

    It has been a long time since you posted here, but I'll give it a chance

    (Excuse my english)
    hi there , just saw yr post.
    For Arduino the shields just get stacked up. So the first layer is the Arduino UNO board, then I inserted in the motor shield on top followed by the LCD shield.
    If you go to the my blog http://sgwetplate.com/2016/11/arduin...ilm-processor/ , I linked to the different shield pages(for example https://www.dfrobot.com/wiki/index.p..._(SKU:_DRI0001) and then from there you have to look at the documentation to see which pin should you use. The shield I used is pretty old so I am now sure how useful would be a wiring diagram be for you as newer shield might use different pins. Let me know if you still need one and I will see how I can get one done.

  9. #19

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    Re: Another DIY Rotary Film Processor

    Quote Originally Posted by Greg View Post
    Experienced that same very gradual movement of the drum. Fortunately it was always in the same direction, so I glued a piece of thin plastic to one of the insides of my darkroom sink. Place my Unicolor roller base with the JOBO drum's base a 1/4 of an inch away from the plastic. As it spins, the drum slowly creeps to be in contact with plastic which stops it from rolling off the Unicolor roller base. After dozens of time doing this, I have yet to see any wear on the bases of my JOBO drums.
    thanks for the tip. I am building version 2 using a wiper motor as now I got a bigger drum. If I ever finish doing it , I will post it here.

  10. #20

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    Re: Another DIY Rotary Film Processor

    Quote Originally Posted by pound View Post
    hi there , just saw yr post.
    For Arduino the shields just get stacked up. So the first layer is the Arduino UNO board, then I inserted in the motor shield on top followed by the LCD shield.
    If you go to the my blog http://sgwetplate.com/2016/11/arduin...ilm-processor/ , I linked to the different shield pages(for example https://www.dfrobot.com/wiki/index.p..._(SKU:_DRI0001) and then from there you have to look at the documentation to see which pin should you use. The shield I used is pretty old so I am now sure how useful would be a wiring diagram be for you as newer shield might use different pins. Let me know if you still need one and I will see how I can get one done.
    Thank you for your answer.
    I'll try to build mine with this info and I'll keep you in touch whatever it goes

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