Homebrew Linear Actuators Improved https://hackaday.com/2023/09/08/homebrew-linear-actuators-improved/ #linearactuators #3dPrinterhacks #linearactuator

Swing Gate Motors Come To Help For Opening A Giant Servery Window

[Martin Roberts] wrote to us, telling us about a build that his company, [Ocean View Workshop], was tasked with. Creating a four meter wide window able to open vertically is no small feat, and it had to be custom-built because the local company building such windows wasn't comfortable working with anything other than aluminum -- insufficient for the window's scale. With massive weight of the glass alone, structural requirements for supporting it, and the mechanical loads to be applied, some careful planning was in order.

To start with, this window had to be motorized, as an average person wouldn't be capable of pulling it upwards. Not satisfied with the linear actuator choice available, they went to a hardware store and found some swing gate actuators that, in workshop tests, proved themselves to be more than capable of handling way over the weight required. In fact, they were capable of lifting [Martin] himself off the ground without much hassle.

Note the jack helping hold the panel in place.

From there, it was time to figure out the mechanical parts -- building a strong enough frame for the window, welding the frame, figuring out the mounting and leverage intricacies, gauging the loads to be handled and adding gas struts. The nitty-gritty of the mechanical bit is covered quite well in the 14-minute video that [Ocean View Workshop] published, embedded below, so we won't repeat it. Instead, our focus is on the swing gate-intended hardware reuse part that [Martin] shared with us in his letter.

The swing gate controller's built-in features, like adjustable limit switch support, soft start/stop and configurable overload/stall protection, proved themselves to be instrumental for smoothness and safety of the window's operation. As for the automation part of it, they interfaced the motor controller with one of the numerous Sonoff devices tied into a Home Assistant-based system, and then even integrated it with Amazon Alexa, adding a 2001: A Space Odyssey Easter egg while at it. In other words, the motorized swing gate hardware and this servery window build turned out to be a perfect match for each other.

We appreciate the ingenuity and hope that the spirit of this story can guide other hackers in similar situations, tasked with building things beyond the scope of what local companies have the toolkit for. [Martin] says he already can think of a few more unintended applications for these - an extra heavy-duty adjustable workbench or a height-adjustable king bed. Limiting availability of linear actuators is somewhat of a pain point, to the point where people build and even 3D print their own, for loads big and small.

#hardware #mischacks #linearactuator #linearactuators #repurposing #swinggate

Clear Off the Coffee Table, It’s Pinball Time

Like many of us, [BuildXYZ] has always wanted to own a pinball machine, but doesn't have the space to justify buying such a big and heavy toy. But where there's a will, there's a way. [BuildXYZ] figured that if they could build a pinball machine into a coffee table form factor, they'd be at least halfway to justification.

[BuildXYZ] didn't choose just any pin. After doing a bunch of research, they settled on 1981's Bally Centaur because it's an early solid-state machine, and it's one of the best. It has no secondary playfield levels to deal with, making it much easier to do this project.

Where do we even start to describe this beautiful labor of love? There are too many details to list, but know that it seems to be equal amounts of restoration work and custom work that brought this table together. The build video after the break is definitely worth your time, and you'll gain a much better appreciation of the amount of time that went into this, from the custom score decoder chip built on an FPGA to the 3D printed replacement drop targets and new acrylic bits to replace the yellowing ones from the playfield.

[BuildXYZ] started by building a pintisserie, which is exactly what it sounds like -- a rotating barbecue spit for a pinball machine's guts that makes it a breeze to work on. This maintenance-friendliness reappears in the new cabinet design, where the circuit boards are screwed to a pair of drawers.

No, you don't have to play it flat. But you do have to clear off the top before pressing Start, because a pair of mini industrial linear actuators raise the back end by 5-7° depending on the setting. We were a little sad about the lack of plunger, but [BuildXYZ] is right -- it would knock at your kneecaps. On the bright side, [BuildXYZ] reused the 'free ball' solenoid as the ball launcher, which is driven by that shiny metal button. Again, be sure to check it out after the break.

Honestly, we haven't seen this much work go into a pinball machine since this one, built entirely from K'nex.

#games #coffeetable #fpga #linearactuators #pinball #pinballmachine