Home Machine Shop Project: Syringe Engine Part 2

A series of short videos showing the up-cycling of various items of scrap metal and plastic into a useable pressure generation device.
Contains sawing, milling, turning, drilling and tapping in the home machine shop.
For demonstration / teaching purposes, as part of my day job as a medical equipment technician, I need to be able to produce an oscillating (air) pressure (of say +/- 20mmHg) overlaid on a static pressure (of maybe 250mmHg).
The absolute pressures aren’t critical; however device creating them would need to run for up to an hour at a time, reliably producing the pulsatile pressure waveform whilst maintaining the underlying static pressure without any net gain or loss.
The oscillating pressure component is required to fool the medical equipment into running a simulated treatment.
The underlying static pressure needs to be adjustable at will to create under / over pressure alarm conditions that may be encountered (e.g. through blockage or leakage) during a typical therapy session whilst a patient is connected, but in the classroom environment where no patient is present.
There are many possible approaches to the design, but with no budget, time, materials, tools or any other resources allocated to the task, I elected to complete the device in my spare time in my home workshop using odds and ends I’d collected from the scrap bin.
Created with subtitles (click the CC box) for the hard of hearing, or when you need to keep the volume low.

Part 1: • Home Machine Shop Proj...
Part 2: • Home Machine Shop Proj...
Part 3: • Home Machine Shop Proj...
Part 4: • Home Machine Shop Proj...
Shot: DMC-TZ30 1280x720 25P MP4
Edit: FCP7 ProRes 422 HQ
Mic: C01U

[@JT-tz5hp]

Superb editing! Great choice of music. Excellent fliming. The inspiration from Click Spring is evident and its welcomed. It is a high class format and much desired. As someone said in a comment on one of your videos. "A refreshing break from the "hey dude" American style machining channels".. Keep it up sir! I'll look forward to more of your content.

[@malcytull]

Love your truing up tool, that's given me food for thought thanks for posting.

[@jakobv8]

Loving part two as well. Your dry humour and smooth editing makes me wonder when you'll be preferring kung fu a la TOT to your hack saw :-)

[@edgeeffect]

Nice, quality, bit of engineering... all from old tosh.... marvellous!

[@PriddyShiddy]

Had similar DRO on my manual. Those and a calculator can do anything needed

[@JBFromOZ]

getting that finish on the parts doesn't seem to take such a bloody long time when you do it mate!

[@sleepypipit9631]

Where do you get all those scraps its insane what you can do with it 👍

[@MrDavehill]

Excellent videos! Can I ask, where did you get you DRO from and was it truly cheap or just cheap in comparison to others! I am a rank amateur so don’t want to spend a fortune. Keep up the good work. 👍

[@Sander_Says]

Maybe the gearbox housing is cast zinc?