Designing Glue Blocks

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Intro to Glue Blocks
Typical stairs consist of two basic components a tread, horizontal, and a riser, vertical. However, over time stairs begin to degrade causing slight warping in the trend. This shrinkage of the wood as well as weaken of the fastener between the riser and trend causes the two components to rub together, this creates an unpleasant squeaking sound.

To solve these problems, a joint called a “glue block” is used with nails or screws to secure the joint to the underside of the trend where it meets the riser. These glue blocks are right triangle prisms and strongly support the perpendicular connection between the tread and riser due to the reinforcement of the right angle.

The name “glue blocks” doesn’t seem to make sense since the joint is primarily supported by screws. The history of the glue block’s function was primary used in furniture, such as chairs. Glue blocks were used in a similar fashion to support the leg and other parts so it may not cause squeaking and when dealing with furniture, glue blocks were installed with glue. It was later that carpenters adopted these glue blocks in the construction of stairs.

Inventor: Designing the Glue Block
2D Sketch on Inventor
When first creating the 2D sketch of the glue block on Inventor, I had to design the triangular face of the joint. Since I understand a glue block is might to strengthen the right angle connection between the riser and the tread, I deduce that the triangle has a right angle. Then considering how the glue blocks are supposed to be installed, it would make the most sense to sketch the triangle so the right angle was to the top corner. However, there are also other considerations that should be made. One of which is the importance of symmetry i...

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...slow at the dimensioning process. I plan that through further experience and practice with Inventor that I will be capable to better create designs more efficiently.
3) How can I do better in a future similar situation?
To do better in a similar future situation, I would work on better time management skills so I complete assignments punctually and to the best of my abilities. Then if I experience any difficulties with Inventor, I will take self-advocacy to ask my teacher or colleague for assistance.
4) Who in my class can offer extra insight?
For extra insight I may always look towards either my teacher or my peers. Since the class is a split Grade 11/ 12 class I can ask my seniors about their past year in Grade 11 Technological Design. Those who are in my year can always offer constructive criticism and I can also give them criticism as well as a mutual benefit.

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