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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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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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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

Continue reading Test 2 of the Popsicle Crane Boom.

Why I built the Crane Boom Hinge the way I did.

The Plan for the Crane Butt.

Last night’s post, Popsicle Crane Update 3 was almost completely about construction of the crane boom hinge end (the “butt” end – a real term used by the crane industry.) I realized on the way to work today I did not talk about why I did what I

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Popsicle Crane Update No. 3

Header

The Plan for the Butt of the Crane Boom

Much progress has been made on the construction of the popsicle stick crane. At the last crane update I had built built the major part of the boom and some pulleys. Since that time I have figured out how to make the pulleys spin fairly

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Column Buckling – Length, Radius of Gyration, & Elasticity

Rubber Columns just don’t get it done.

It this post I am going to try to tie together all of the recent posts about the forces on beams, moment of inertia, and the stress-strain curve. This is an overview and not number crunching like the last post. Since we are dealing with unknowns with

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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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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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Some videos of Real Cranes & one note about electrical meters.

This is just a short post to kind of clean up a few loose ends. Besides, it is about time we had a “light” post. (Tastes great… less filling… something like that.)

Electrical:

First, I want to clear up something that was not said about the voltmeter. Most newer style meters use an amplifier inside

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