The LE40V pick & place PCB holders consist of 2 adjustable brackets that are meant to hold the PCB tightly on 2 sides (let’s call them TOP and BOTTOM) while the machine pounds the panel with parts. Typically you’d set the TOP side bracket to a fixed position that is perpendicular to the machine rails and only adjust the BOTTOM bracket depending on the PCB panel size, and hope you won’t snap your freshly solder pasted panel in half when you tighten it in. Also worth noting that by default there is empty space (ie. nothing) below the PCB for support. After only a few uses it becomes obvious this is a terrible design and unscrewing/tightening hex nuts every time a new size panel goes in the machine gets old super fast. And yes – I snapped V-scored PCB panels to pieces on more than a few occasions thanks to this amazingly clever mechanism.
After some time I added a rigid metal sheet base to actually properly support panels in the machine and that allowed using magnets to hold the panels instead. Worked pretty well for a few years but rare earth magnets are not very easy to handle. Finally I thought maybe I can really fix this with a new magnetic bracket and shoot a video of making it happen. The result is below. I am quite thrilled with these holders that can secure the panels quickly and are a snap to adjust without overlapping much PCB area. Here’s a video showing how these work and how I modeled the parts:
We’ve had two of these iPad keyboards and they are quite nice other than having a very poorly designed corner holders. Needless to say they broke within just days after purchase, nothing surprising with kids in the house. I haven’t thrown them away and kept them around for years hoping they might be useful some day. That day has come and I will show you how a simple fix has brought life back to these sad and lonely keyboards!
After sawing off the broken parts, I came up with two designs. One is a replacement for the broken corner only and leaves the other original corner. The other extends on the entire top side and replaces both the original corner holders. I used this honeycomb design to save on material and not spend eternity redesigning the wheel. I modified that model in the following ways:
I made the bottom thinner since it was too thick
I sliced away the case to create the corner version and top side only
I cut sliced away the casing where iPad buttons are to allow easier access
No rocket science here, printed these in PLA, some super glue cement the printed parts into the old cases. I will let photos tell the story. Continue reading →
After you finally figure out the right settings and calibrate your 3D printer head and it makes prints that stick very well to your printer bed, it’s time to figure out how to remove the prints without damaging them. I went to HomeDepot to find a scraper but all are too thick and very rigid, and … $5+. I can do better.
I have tons of old stainless steel stencils of various thicknesses, and all are very nice and flexible, perfectly thin to squeeze under a print and pry it off the bed.
I tried using one bare handed a few times and while its not as dangerous as a razor it’s still thin and if I try long and hard enough I will get injured. Sure you can dull it but I don’t like how short razors are, I wanted more of a proper scraper size. Continue reading →
Update: a sensor pylon is now available also, which can conveniently hold the hall effect sensor for the magnet holder, a very nice addition. The kit sensor is omnipolar so it will detect the magnet in either direction.