![]() ![]() Never thought of a clever way of making it. And even after this fall, it was the plastic that chipped, the electronics were perfectly in tact.ĭ- Didn’t make the lid. This fall was the straw that broke the camel’s back. I would, without a doubt, say that TI calculators are extremely well-built. ![]() This calculator has been with me for more than a good four years, and has taken many spills, including some onto concrete sidewalks. The machining time was around 10 hours, and even if it could be cut down to 2 hours of machining time, the cost of the case would still exceed the cost of a new TI-89.ĭrew- Appreciated the comment. At the moment, it the business does not seem profitable. A lot of work has to be done after the casting to make it look nice. Also casting doesn’t leave a really nice finish. I could possibly make a mold from the original case and cast that instead. Unfortunately, this being a machining project, the design elegance took a back seat. There will forever be this tradeoff between manufacturability and design elegance. James- Yes, it is on the blocky (and heavy) side. Jake- I needed a TI-89 pretty bad, so I ended up buying another one, but needed a summer project that would get me more machining knowledge. Mechanical Engineer- I dropped my TI-89 on numerous occasions, and what finally happened was a little piece of plastic that was part of the battery compartment snapped (see the 1st picture), so the calculator was fine, but wasn’t getting any power. Total time time spent on the project? probably around 60 hours. Total machining time for the final piece was around 10 hours. There were 3 versions machined from plastic before I machined the aluminum version. Kyle- Yes, I do have access to a machine shop (Haas Mini Mill), and though I have made many parts before, this is my first serious machining project, and learned a lot doing it. Nes- Yes, the stylish taper was deleted, which is a shame. Not to mention its going to get scratched up anyways.īrennan- One of the best machinists I’ve met actually has a degree in Industrial Engineering, believe it or not! ![]() But there comes a time when the new school year is about to begin, and I just want to finish my summer project. SteveO- You’re probably right… I have a Bachelors Degree in Mechanical Engineering.Īaryn- Yes it does! I have the file all set up so it says TI-89 Aluminum, but it doesn’t not fit on the bezel, which is quite ashame. Reno- Thought about it, but Titanium costs significantly more than Aluminum. However, I’ve used the TI-89 long enough that it doesn’t really matter. however, having them color-coded would be better since I would know which secondary functions correspond to the diamond key and which secondary functions corresponded to the 2nd key. The text on the buttons are easier to read than how it seems in the picture. Jeremy- Thought of rechargeable batteries, but I think a set of AAA’s last for almost half a year, so I don’t think it was necessary. Hey Guys… I’m Howard (the geek that built that calculator) Thanks for the comments. ![]()
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