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Changes were not made to her original building techniques and style, in order to keep the original meaning of her directions intact. This guide is a personal advice page by Aia. The goal of this guide is to help new and intermediate builders contend with the complexities of the boomilever event.

I built towers inboomilevers inand bridges inso I hope to offer advice from my own experiences. There are doubtlessly better designs and better building techniques out there. However, I believe my work can be used as a great springboard for learning the event. In the above diagram, I have color coded the major parts best woodworking roller stand 5g a boomilever.

Every boomilever I have ever seen built for Science Olympiad has these main parts. Here are the names I have used for them in this guide:. Note that I did not color code the members that extend vertically from compression to tension. Very few boomilevers use these members, but I will call them compression-tension connectors when I reference them in this guide.

In my opinion, the boomilever event is won and lost in the compression members. The winning builders are always those who have figured out how to create the best weight-to-mass ratios in their compression. Since they are usually the heaviest part of any boomilever, this isn't surprising.

There are hundreds of different ways to engineer your compression members. I ultimately opted for a "single stick" compression approach and then found the ideal density for those sticks.

In retrospect, I would not use this approach again. I found that any issue with the balsa used for the compression for example, non-parallel grain, non-uniform density, etc. It was sometimes impossible to identity faulty pieces of balsa beforehand. Many of the most successful boomilevers I saw during the season used a much more complex approach. In the above image, I have shown a number of different types of compression members. Given what I know now, I would suggest experimenting with many different types of compression at the beginning of the season.

Hopefully you can then identify a promising design and continue to perfect it from there. I also strongly recommend looking at high-scoring elevated bridges from and in the gallery. These bridges utilize much of the same engineering that boomilevers will require in the compression.

In the season, two of the most commonly used designs were the designs Best Woodworking Roller Stand In shown in the above photo's top left and bottom right - commonly called "tower chimney" and "two column" styled boomilevers, respectively. Both designs proved to yield similar results, with tower chimney style boomilevers performing on average slightly better. In the and seasons, a rule best woodworking roller stand 5g was added so that the contact width best woodworking roller stand 5g the boomilever must be at least 8 cm wide at best woodworking roller stand 5g wall see SOINC's Boomilever Diagram.

Because of this, modifications to boomilevers have been made. In the first half of the boomilever, the tower shrinks down from 8cm to 5cm, and for the second half, the compression members are parallel, best woodworking roller stand 5g at 5 cm apart.

Alternatives of the above methods of compression members are possible. In the competitive scene, teams occasionally have boomilevers that are best woodworking roller stand 5g than 5 cm apart, usually around 2. Although harder to build and test, it has advantages which include better tension member strength and usually slightly higher scores. I tried using balsa tension members, but they routinely broke early in the loading process. My tension members were forced to "curve in" because I wanted to minimize the size of my base.

I think that this added curve made the balsa tension members much more prone to shearing apart. When purchasing wood, I suggest bringing a scale and only buying the lightest bass sticks.

Although bass doesn't vary in mass nearly as best woodworking roller stand 5g as balsa does, I could still find pieces that were best woodworking roller stand 5g lighter. The distal end of a boomilever where compression members attach to tension is another critical area that needs strong reinforcement.

If failure occurs at this connection point without any failure in compression, the boomilever has not reached its highest potential score. In a nutshell, I contended with the distal end by artificially increasing glue surface area, adding a lamination, and using gorilla glue and clamps. Although many pictures of my distal end design can be seen hereI have created best woodworking roller stand 5g few color-coded diagrams to show the hidden engineering behind them.

This first diagram shows a side view of the distal end. I began by using purple CA glue to add the small purple stick alongside the bottom of the compression members in the same vertical plane. This purple stick was usually never longer than three centimeters. As you can see, it needed to be long enough to later accommodate a tension member and two green pieces that will be placed on either side.

I then used Best Woodworking Roller Stand Generator the same purple CA glue to connect the compression and tension members as a lap joint. Note that the tension member also extends over the purple piece. The added surface area for the tension member is key to strengthening the joint. My next step was to add the green members on either side of the tension. Note best woodworking roller stand 5g these green sticks also extend over the purple piece of balsa.

I typically used balsa that was the same size as the bass compression members for this step. However, instead of using purple CA glue here, I opted for gorilla glue. In the final step, I used a wide balsa stick to laminate over the green members and the tension member. I also used gorilla glue in this lamination and clamped the result for 24 hours. After these steps, the distal end connection basically becomes a sandwiched tension member. The reinforcement may be overkill, but I never had failures at this joint after adopting this approach.

As a side note, I did typically sand this joint after the gorilla glue dried to remove excess wood and glue. However, there were a few areas around the joint I did not sand for fear of accidentally nicking the tension members and creating unnecessary weakness. The image below shows the finished result. Compression cross members as seen here Best Woodworking Roller Stand 4g are all of the members used to connect the compression members.

These members are typically very tiny and light. There are two main sizes of balsa that I have seen used for these members:. From what I've seen, most builders have a strong preference for one of the two sizes.

I would suggest experimenting with both to determine which works best for you. The base is arguably the most important part of the boomilever. The following instructions show how to build a functional, mid-weight base.

Starting from the season, rules required you took hook your boomilever onto a J-hook best woodworking roller stand 5g Nrather than to bolt your boomilever onto the testing apparatus, which can be seen here.

No matter what design is best woodworking roller stand 5g, the larger the surface area of the base, the better as the force is spread to a larger area. However, it is important that the base material is rigid and does not bend, or else the base will split.

The latter often performs better than the former, due to the lesser weight of the base. Moreover, when a force is applied to a side of a stick - in this case, the base - a shorter member buckles less easily than the longer member. In best woodworking roller stand 5g section of the guide, I have best woodworking roller stand 5g the most common building topics I see discussed on best woodworking roller stand 5g forum.

If I have missed any major topics, feel free to send me a message and I will add best woodworking roller stand 5g new section.

In my opinion, neither one is inherently better than the other. However, based on availability alone, I do believe balsa is a better option than bass for most builders.

For the boomilever event, Best woodworking roller stand 5g used both balsa and bass. I typically used best woodworking roller stand 5g tension members and a small amount of bass in the lamination of my base.

I used balsa everywhere else. Using the. Although variable density can prove advantageous to the builder, it also carries the danger of being non-uniform. Let me illustrate this issue with an experience from my tower years:.

To contend with the variability of balsa, I suggest recording the weight of each piece not each stick of balsa you best woodworking roller stand 5g in your final structure. For example, record the weight of each tension member in your boomilever, the mass of each component of the base, etc.

This will help you maintain tension members, compression members, etc. These values also provide an easy way to quantify the distribution of weight in your structure and allow easy replication later.

If you purchase balsa on your own, I also best woodworking roller stand 5g looking at balsa grain as a means of balsa quality control. Some balsa sticks have several types of grain, depending on which face you are looking at. As a general rule of thumb, the grain should ALWAYS run parallel to the edge of the wood, especially in balsa that will be used in compression members.

Balsa tends to shear along grain lines, and I found this especially true for boomilever compression members. Looking at balsa sticks before purchase also allows you to note any major defects, such as crookedness or splintering. As you build more and more structures, you will come to learn that each type of grain has advantages and disadvantages. I generally found that C grain worked best for compression.

If you choose to use balsa for the tension members of the boomilever, A grain would be the optimal grain. The image below shows my building area while constructing a bridge. I would suggest obtaining many of the items you see here. Other tools that I used included graph paper, wax paper, calculator, yardstick, fine point pen, and ruler. Navigation menu Personal tools Log in. Namespaces Page Discussion.

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