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  1. Josef_G

    Setting RPM on electric Motor

    Hey everyone, I'm looking for a closed-loop motor, where I can set the RPM and the motor works out how to reach the set point. I considered using a standard DC motor with a hall effect sensor as feedback, but I'm certain that there must be an off-the-shelf unit with the same functionality...
  2. Josef_G

    Question about "complex" tubing

    Hey, I've got a medical device prototype with a complex tubing system for drug delivery. I've used various different tube-to-tube and syringe-to-tube adapters in the system, so it's made up of various different pieces that need to be put together before use. I would like to replicate the tubing...
  3. Josef_G

    Recommendations for 3D printer

    I see that this thread is still being used, so I'd like to add my two cents about our final choice (Prusa SL1). Honestly, my hopes were much higher than what the SL1 could provide. I couldn't get a better accuracy than +-0.2mm, and worst of all, it started acting up less than 2 months of use...
  4. Josef_G

    Static buildup and electric properties of 3d printed part (SLA, Resin)

    Hi everyone, I'm building a prototype that uses a power supply which is divided into 4 separate 24V supplies. They do not share a common ground. I shorted all of their grounds, but it's really messy with lots wires running all over the device. In order to keep everything tidy I printed a part to...
  5. Josef_G

    Recommendations for 3D printer

    Thanks everyone for your input. We've settled in the meantime for a Prusa SL1, in the future we will likely get the Form 3. Please feel free to continue to add your input!
  6. Josef_G

    Tubing recommendations?

    Hey, I'm looking for a tube to fit s system with barbs like this one: which fits 1/8 inch ID tubing. I need it to bend easily and also not collapse under a vacuum. The system is for medical purposes. Any recommendations?
  7. Josef_G

    Viscous flow in pipes

    Hello, I'm designing a foam delivery system, and I need to keep it under a certain pressure. I'd like to model the foam as a viscous fluid in order to get a rough estimate of pressure in the tubing system as a function of fluid velocity, viscosity and pipe diameter. Could anyone point me in the...
  8. Josef_G

    Recommendations for 3D printer

    Hey ctopher, I'd actually really like to spend a few hours putting it together. Would there be a difference in precision if I did that, or is the precision easily reproducible?
  9. Josef_G

    Recommendations for 3D printer

    Thanks for the recommendations. itsmoked - That looks like a very solid idea. I looked around online and the reviews for the Prusa i3 all suggest that it's a great product. For anyone interested in the idea of printers printing more printers: Prusa i3 Farm EngDesServices - I've actually been...
  10. Josef_G

    Recommendations for 3D printer

    Hello all, I'm looking for recommendations for a 3D printer based on the following criteria: - The printed parts are to be used in a medical device prototype. - The printed parts will be used in pre-clinical trials, so any important regulatory issues such as material used could be meaningful. -...
  11. Josef_G

    Filters with a Luer connection

    Thanks! I need to work on my googling skills.
  12. Josef_G

    Filters with a Luer connection

    Hello all, As said in the title, I am searching for a filter that connects to a Luer component. For example: https://www.hplcvials.com/d/pic/hplc-syringe-filter/five1-1.jpg The problem is that I'm looking for one with a pore size of at least a 5 micro-meter, hopefully larger. Can anyone assist...
  13. Josef_G

    Tube to tube connectors

    jari001 - Regarding the tubing: You are correct, except that I don't necessarily WANT to use a printed part, but might consider it. I think I will go with danschwind's suggestion and order a complete set from a single supplier. I will likely opt for plastic tubing. Regarding the calculation...
  14. Josef_G

    Tube to tube connectors

    Once again, thank you very much for your reply. I'm not certain who the manufacturer is. These are pretty old tubes that served their purpose well enough in the meantime. I could consider changing them if it helps me solve this problem, and hey will definitely be replaced sooner or later. Based...
  15. Josef_G

    Tube to tube connectors

    Thanks for the reply! I've got a pressure relief valve mounted onto the piece with the bigger dimensions, which I would like to use as a fail-safe in my system. The flow through these tubes is very slow, so my assumption is that the change in dimensions will only negligibly change the pressure...
  16. Josef_G

    Tube to tube connectors

    Hello all, I'd like to connect two tubes as follows: Tube 1 - ID = 3.5mm OD = 6.8mm Tube 2 - ID = 18.0mm OD = 21.1mm IS there a standard connector that can be used to connect these tubes? I'm building a prototype and have considered 3D printing a connector and fastening the tubes to it with...
  17. Josef_G

    Power Supply Issues

    Thanks for your replies. I definitely should have thought of uploading a schematic and will do so as soon as I can.
  18. Josef_G

    Power Supply Issues

    Hi, I'm a new engineer working on a prototype with a circuit including the following components: PLC (24V) Servo Motor (separate channel, 5V) Push Button ,fed by the same 24V and fed to the PLC. I've written a very basic code, where I want the servo to perform a certain pattern of movement...

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