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  • Users: Josef_G
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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

    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...
  4. 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?
  5. 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...
  6. 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. -...
  7. 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...
  8. 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...
  9. 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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