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Revision as of 10:36, 10 February 2015


E. Hunt D80 Presentation on the Open-Source Syringe Pump
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Source

Abstract

Double-pump.jpg

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This article explores a new open-source method for developing and manufacturing high-quality scientific equipment suitable for use in virtually any laboratory. A syringe pump was designed using freely available open-source computer aided design (CAD) software and manufactured using an open-source RepRap 3-D printer and readily available parts. The design, bill of materials and assembly instructions are globally available to anyone wishing to use them. Details are provided covering the use of the CAD software and the RepRap 3-D printer. The use of an open-source Raspberry Pi computer as a wireless control device is also illustrated. Performance of the syringe pump was assessed and the methods used for assessment are detailed. The cost of the entire system, including the controller and web-based control interface, is on the order of 5% or less than one would expect to pay for a commercial syringe pump having similar performance. The design should suit the needs of a given research activity requiring a syringe pump including carefully controlled dosing of reagents, pharmaceuticals, and delivery of viscous 3-D printer media among other applications.

Key Words

open source hardware, open source scientific hardware

Materials and Tools

Note: This page describes the mechanical build and software installation.  Please refer to the paper for the electronics.
Materials for syringe pump
Parts for syringe pump assembly.
Materials
Description Count
Motor End 1
Carriage 1
Plunger Holder base and tab 1
Body Holder 2
Idler End 1
NEMA17 motor 1
5mm x 5mm shaft coupling 1
625z ball bearing 2
LM6UU linear bearing 2
M3 x 10mm socket head cap screw 6
M3 x 16mm socket head cap screw 4
M3 x 16mm socket head cap screw 4
M3 x 20mm socket head cap screws 3
M3 hex nut 13
M5 hex nut 5
M5 threaded rod 0.2 m
6mm A2 tool steel 0.4 m
Necessary tools
Necessary tools for assembling syringe pump.
Tools
M3 allen key
3mm drill bit

Procedure

  1. Motor end mounted to motor.
    Secure motor into the motor end using 4 M3 washers and 4 M3 x 20mm socket head cap screws.
  2. Metal rods inserted in motor end.
    Insert the 2 metal rods into motor end, then secure them in place with 2 M3 nuts and 2 M3 x 10mm  socket head cap screws.
  3. Threaded rod coupled to motor.
    Insert threaded rod into the coupler halfway, the other half should be on the motor, secure it.
  4. Not hollowed-out carriage.
    Hollowed out carriage.
    Hollow out the two ends of the carriage, with a handheld drill bit or knife to make a hole in the plastic.
  5. Linear bearings and nut inserted in the carriage.
    Snap the linear bearings into place on the hollowed out ends of the carriage. Then insert an M5 nut into the nut-trap on the bottom of the carriage.
  6. Base of the plunger holder attached to carriage
    Attach the base of the Plunger holder to the carriage with 2 M3 nuts and 2 M3 x 10mm socket head cap screws.
  7. Carriage threaded onto the rods.
    Slide the carriage onto the threaded rod and make sure the two metal rods fit into the linear bearings.
  8. M5 nutes mounted on threaded rod.
    After the carriage is midway down the threaded rod, thread two M5 nuts onto the threaded rod.
  9. Bearings inserted into the idler end.
    Insert the two bearings into the circular slots in the idler end.
  10. Idler end mounted on the rods.
    Now slide the idler end onto the rods and secure it with two more M5 nuts on the end of the threaded rod. Push the two nuts already on the rod up to the idler end to secure it.
  11. Syringe in the body and plunger holders.
    Insert the syringe body into the body holders, then slide the plunger into the base of the plunger holder.
  12. Syringe in the body and plunger holders.
    Syringe in the body and plunger holders.
    Using four M3 x 40mm bolts, four M3 washers, and four M3 nuts secure the two holding pieces to the idler end of the pump. Put two nuts it the top of the holder closer to the carriage and two nuts in the bottom of the holder against the idler end.
  13. Mounted syringe.
    Insert the tab of the plunger holder on top of the plunger to secure it to the pump and prevent slipping when in use.


Controller: Connection and Calibration

Necessary tools
Items to connect and control the syringe pump.
Controller
two ethernet cables
raspberry pi (case optional)
micro-USB adaptor cable
wireless router
  1. Install on the Raspberry Pi the packages python-xdgbasedir, python-network and python-websockets from [1].
  2. Install the syringe pump server to the Pi in /usr/local/sbin/ and make sure it is executable (chmod a+x /usr/local/sbin/pump-server).
  3. Install the html directory (including its contents) from that same location as /usr/share/pump-server/html/.
  4. To make it start at boot, add to /etc/rc.local, before the exit command, a line containing /usr/local/sbin/pump-server &
  5. Reboot the Pi.
  6. Motor plugged into raspberry pi.
    Plug the motor into the raspberry pi. If the motor is plugged in the wrong way the pump will push when its told to pull. NOTE: Do not plug and unplug the motor from the pi if the pi is plugged in to a power source.
  7. Micro-USB plugged into raspberry pi.
    Using a micro-USB adaptor plug the raspberry pi into the computer.
  8. Raspberry pi hooked up to router.
    Plug an ethernet cable into the raspberry pi, then connect it to the Netgear wireless router. Then connect the router to the computer with another ethernet cable.
  9. Plug everything into an outlet and turn on the router. Look to see that your computer recognizes the network. Once it does, switch over to that network and open up your web browser. Type in the address bar: pi.local:8080. NOTE: This is only the address if a version of Linux is in use. We have no practical way to get the address on Windows or Mac, however it does work on Windows and Mac if the name can be obtained.
  10. Raspberry pi hooked up to router.
    The site that is now opened is the pump control interface. Set it to a lower speed, then pull the syringe out slightly past a big marker. Then using tiny steps, push the syringe to the bigger marker so the plunger is exactly on the mark. Then push it 50 mm, and record how many milliliters it moves. Then divide the number of milliliters it went by the number of millimeters you pushed it and plug that number into the calibration window.

See also

Coupled Initiatives

In the News

"Another day, another phenomenal addition to the list of practical, hype-less, real, tangible, 3D printable tools that are bound to bring on some welcome changes. This time, it’s the scientific community that can sing praises and raise their glasses as they’re about to reap the benefits – and save a bundle – on 3D printed syringe pumps."
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