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General Motors
On Fri, 27 Mar 2020 18:19:45 -0400, "Mr. Luddite"
wrote: Apparently, after promising to tool up to produce ventilators, GM started demanding excessive up front money, jacking the price per ventilator up and producing less than was originally promised. Trump just punched back, invoking the Defense Production Act to require General Motors to produce the ventilators, like it or not. That's it. I am trading my GM Canyon in on a Ford. There was a guy from a ventilator company on NBC tonight saying they have a deal with GM so let's see how that goes. These things still take time. It took almost a year before the Guide Lamp division could tool up to make M3 submachine guns in WWII but once they did, they were rolling out the door by the thousands. I just wonder what we are going to do with a half million ventilators when this is all over. I am still fascinated with the bare bones designs after looking at the MIT thing. I see a few things they could improve right away. It is clear these boys were working with what they had in the robotics lab and the actuator is far too complicated, perhaps too fragile too for something that has to go three quarters of a million cycles or more a month. I think some kind of industrial bellows, a gear rack and a stepper motor might be more appropriate and cheaper. I doubt you even need a PIC. Maybe something as simple as a dual 556 timer, a D flipflop to make pretty square waves and a stepper motor driver chip. Timer one is the stepper motor drive and timer two sets up the timing and length of the stroke, in conjunction with the motor speed. A couple of opto sensors to tell you where the rack is and a pressure regulator. The brain could be a couple of garden variety CMOS gates just determine which way to go based on where the opto sensors says it is. I doubt I am much over $20 in parts plus the price of the can, a filter and the mask hose assembly. The reality is once someone designs the can and the mounting points for the hardware in a pattern that any metal fab shop can bang out, this is easily that $100 ventilator and it could be built in a light industrial bay anywhere. That is just me thinking out loud. I have every confidence American ingenuity will solve these problems pretty fast. BTW, no gloves, use a dog poop bag if you are just handling random objects that might be contaminated. (an idea from the military Facebook group) |
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