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Stiffening up the Homemade Box and Pan Brake

The brace to stiffen the box and pan brake.

After doing a lot of work in previous tests I determined the brake could get the job done on small pieces of metal but just could not get it done on longer pieces because the hinged board was bowing when I applied the force necessary

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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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Short term energy storage, time delays, and oscillations.

We are quickly getting toward the end of our talk the theory of the thermistor circuit and will soon move that into construction. While construction is interesting, it is tough to create frequent posts of interesting content, so we are very soon going to move into some energy storage components. In electricity those are inductors

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How Our Craft Stick Beams Resist Bending.

Four 2 X 3 Popsicle Columns

Cross section view of possible craft stick beams.

The problem we have with the craft sticks and bending is bending in the thin direction (axis). The answer I have come up with is stacking the sticks to get a wider beam in that direction as shown in

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How a beam resists bending. (Moment of Inertia)

Rubber Band simulation of a beam subjected to bending.

In the post “Stress, Strain and finding center“, I talked about simple compression and tension and how beam or column elongates under tension and shrinks under compression. In the elastic portion of the stress strain curve the beam is acting like a very very strong

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The centroid (center) of a beam.

Several posts ago I talked about finding the center of mass of an object. That procedure when applied to a flat surface (a plane) is used to locate the point called the centroid. The the plane is a flat plate made completely from a uniform material, the centroid is where a pin could be

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Stress, Strain and finding center.

Stress – Strain curve for metal.

This is the first of what will probably be three posts on the theory about the loading of beams and columns. This is why I am building the popsicle crane boom in the way I am doing it.

We have been tied up in details lately, so I

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Crane Boom Analysis Part 2.

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

This is a continuation of the last post and our attempt to understand the forces acting on a crane boom. The summary of where we left it was:

All of the forces along the boom will compress the boom. The boom weight and the

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Post 58A – Parallelogram Linkage

Back in the day…(that is what us old guys are supposed to say 🙂 ) back in the day when things were much more mechanical oriented there were a lot of very interesting mechanisms. One of the simplest and often used is called a Parallelogram Linkage. A simple drawing of this shown in the first

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Episode 40 – Metal Fasterners for wood.

So far we have talked a lot about measurements, calculations, planning and cutting wood, Today we will talk about things used to connect wood pieces together to build things. For fine wood working such as cabinets and furniture no fasteners are used, but for framing of buildings and more common wood projects the wood is

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