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Are there any? Preferably free/open-source.

Does anyone know whether aviation incandescent light bulbs used for various cockpit lighting are special in any way? How precise do voltages need to be? How sensitive are they to ripple/noise/spikes/etc in the power supply?

The third post has a diagram of a side view of a gantry for a CNC Router and the forces upon it. https://www.cnczone.com/forums/diy-cnc-router-table-machines/205766-cnc-cad-posts-3.html Question is, the force arrows look wrong to me. Shouldn't the pivot point be point A in both directions of...

Hi, I'm interested in learning GD&T and also Fits and Tolerances. What would be the best way for me to learn these two things short of going to uni? Books, online resources etc. Do I need to learn one before the other or are these largely independent?

Hi, Trying to figure out how to attach a wheel between two plates like this: https://i.ebayimg.com/images/g/iYcAAOSwFe5XxwA~/s-l300.jpg I don't want to use a bolt because the bolt and the nut would be adding width to the assembly - I'm trying to keep the whole construction as narrow as...

Hi, I'm building a recreational flight simulator. I'm no professional engineer and need some help with designing a base. Maybe one day, I'll put the simulator onto a 6dof motion platform so I would like to design the base with that in mind. How would you go about talking this task? How do I...

Hi, I'm trying to make a custom silicone rubber keyboard. I'm having a real hard time finding information that would be of use with this challenge. I am trying to make it such that the base layer is transparent although it doesn't have to be clear and then on top of this I need to paint or put...

Hi Guys, I'm designing some basic things but I need some clarification regarding the gap that I should leave. If I have a cutout and then into that cutout I insert another part of the same shape, how big a gap should I use? If you add paint, the part that I'll be inserting will become larger...

Hi, I've got a couple of questions about this system. The way I see it, this system has two sections, a high pressure and a low pressure section. Before the engine driven pumps in green, the system is low pressure and high pressure thereafter. I guess this is why the shut off valves in red are...

Hi Guys, was hoping to run this past some different eyes to see what can be improved and perhaps changed altogether. https://youtu.be/BBIsmKwa1hU basically, you pull on the lever with your hand (index and middle fingers) on the white handle to pull it out of the detent, move it to a new...