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Thread: Z axis calibration idea
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05-18-2014, 03:27 PM #51
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05-19-2014, 03:12 AM #52
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How much does the potentiometric transducer cost. Where can you buy it from and mechanically how do you set it up? We could try it !!!!! What would be the potential Z axis resolution?
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05-19-2014, 09:58 AM #53
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Is the liquid we are dripping in to the container conductive? I.E. is it saltwater? If it is, we could make long resistive strips and line the container with them and measure the resistance across it. As the water level rises, current will go through less of the resistive material and will cut across the liquid to the other side reducing the resistance in real time as the liquid level rises. It could be configured as a voltage divider and output pure analog values that could be scaled to z height.
You could use that instead of the float idea for measuring the height. I personally don't like the idea of a float as there is a mechanical element to the sensor that will rely on friction among the edge of the container or whatever your float is sliding against.
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05-19-2014, 12:13 PM #54
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05-19-2014, 12:24 PM #55
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Can you explain what you mean? When you talk about level, are you talking concentration? You could probably assume a concentration based on the initial value when starting the print.
EDIT:
Also, if you use a relatively high resistance material, the variability or the resistance of the salt water could probably be rendered negligibleLast edited by EthanSpitz; 05-19-2014 at 12:37 PM.
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05-19-2014, 01:15 PM #56
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A more volatile variable could be the high resistance of the uncured resin floating on top of the saline. Uncured resin adheres to the side walls of the tank for a little while as it rises, making the blurring effect you see at the bottom of the resin layer in the demonstration videos, it would also adhere to the resistor strips, unpredictably increasing the resistance between the two strips until it is sufficiently washed off by the saline (a distance which also can't cleanly be predicted).
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05-19-2014, 01:41 PM #57
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05-19-2014, 01:45 PM #58
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Also in general it is hard to get good accuracy using resistors. So I think that capacitance based circuits (such as the caliper) are preferable.
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05-19-2014, 01:48 PM #59
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05-19-2014, 02:03 PM #60
Would it be possible to use a jewlery scale to find the weight of the upper container, to calculate the volume in stead of meassuring the level in the lower container? You get pretty cheap ones with 0.1g accuracy.....
Qidi X Plus 3 Paper thin first...
Yesterday, 01:15 AM in General 3D Printing Discussion