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Calculating the “Hinge Boom” on the crane.

The angle from the cables to the new frame.

In the last post about the crane, “Using CAD in initial design – More work on the Popsicle Crane“, we determined all of the angles necessary to calculate the forces on all the beams and cables. In this post I will calculate all those forces

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Using CAD in initial design – More work on the Popsicle Crane

The Base Drawing of the Crane.

People normally think of CAD drawings being used to produce finished plans. While that is probably the main use for drawings, CAD is very useful in all stages of design including conception and analysis. I have decided that I will do more work on the Popsicle Crane and

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Capacitors and Alternating Current.

Rate of Change in a Sine wave.

One of the important concepts I hope I have driven home in the two previous posts about capacitors is the current in and out of a capacitor is related to how much difference there is between the source and voltage stored in the capacitor. We are going

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Sinusoidal waveforms, AC, and DC signals.

A sine wave

The whole purpose for almost all electronics is to modify changing signals. Even in the case of our thermistor circuit, there would be no reason to be interested in the temperature if it did not change. This is our introduction to signals and AC.

The type of waveform that is always

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Parachute Cord and Popsicle Crane Analysis

Face View of the Spring Scale

I spent some time analyzing the good the bad and the ugly of the popsicle crane boom test and there was some of all three. The main problem was the parachute cord stretching but I also did not have the angles I thought I did. First, the issue

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Test 2 of the Popsicle Crane Boom.

The crane boom.

Last night I tested the crane boom and the video has been published. The boom did a great job. The cables did not. I used paracord for the most stressed cables and it turns out that paracord is very elastic and I was not able to maintain the angle of the

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Making a fixture to cut dovetail slots – Making the do-nothing machine manually

The Do-nothing machine base with hand cut slots.

I have read many many places that you can cut dovetail slots in a board by hand. They say use a saw to cut the outer edges and then use a chisel to remove the material in the center. That all sounds good, except I was

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Analysis of the movement of the Do-Nothing Machine

The circumference of an ellipse with a 8″ minor axis and 12″ major axis

This weekend I completed the program to produce data about the do-nothing machine and analyzed the data using a graphing program called Veusz. I answered some of my questions about the motion as well as I found a surprise. There

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Programming the Do-Nothing Grinder

The Working Painted Do-Nothing

The problem with doing these posts is that often I don’t have time to finish the things I have started. There are several things I want to finish before I call the do-nothing machine complete. (If you are new to here, a site search for “do-nothing machine” and “ellipsograph” will

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The Popsicle Crane boom – Test 1.

Picture 1: All of the loads acting on the boom.

Over this long 3 day weekend I finally got the initial test tower completed and did some testing. In many ways it was my testing that failed and not the tower. There is a story often told in math class about the frog dying

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