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pcb-tips [2021/01/13 22:35] – benh | pcb-tips [2022/07/15 16:02] – benh | ||
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==== Miscellaneous processing tips! ==== | ==== Miscellaneous processing tips! ==== | ||
+ | //So you made a few boards. Or not! Either way, this is a running list of tips and tricks for users - things to do and things to avoid, in absolutely no order whatsoever other than the order in which we discovered them. This is basically the Institutional Knowledge of the LPKF equipment at The Hive. We make no guarantee with any of these, but we have found that they' | ||
- | Some additional notes on board design and fabrication: | ||
- | * Slots are hard in this process. Please consider using a single drill hit that’s wide enough if possible. If it’s unavoidable, | ||
* Plating is typically avoidable by making vias with a diameter of 40 mil (1 mm). A standard 0.1” header pin can then be pushed through and soldered on both the top and bottom. | * Plating is typically avoidable by making vias with a diameter of 40 mil (1 mm). A standard 0.1” header pin can then be pushed through and soldered on both the top and bottom. | ||
- | * Higher polygon isolation will reduce the chance of bridging to a plane during assembly (since we don’t really offer soldermask). However, it will also increase etch time. | + | * Higher polygon isolation will reduce the chance of bridging to a plane during assembly (since we don’t really offer soldermask). However, it will also increase etch time because more of the substrate will be etched. " |
- | + | * Slots! We can do them! Here are a few methods for doing them: | |
- | ProtoMat: | + | * The best method is if your CAD program allows you to generate oval holes. Then just export those with your drill file (either plated or unplated) and it should work fine. |
- | * Use the “ProtoLaser – ProtoMat – Double Sided – NoTHP” template | + | * If you have square slots with a minimum dimension of at least 1mm AND they do not need plating, you can add the slots in the same layer as the board's outline in your CAD software such that they get plotted onto the Gerber that gets assigned to the " |
- | * Orient all your boards *before* creating any fiducials. | + | * Plated square slots have not been demonstrated yet, but my guess would be that if they have a minimum dimension of at least 1mm, then you can use a similar method |
- | * 4 fiducials – always. | + | * Overlapping drill hits can be used as a rough approximation |
- | * Do not forget to save before the toolpath! | + | * If you're interested in optimizing your ProtoLaser experience, see the [[https:// |
- | + | * Laser precision is dictated by many things, some (even many) of which are likely beyond your control as a user. Here is a completely-uncomplete list of some of these things | |
- | ProtoLaser: | + | * Flatness of your substrate |
- | * Sometimes, when placing | + | * Laser power and other material-specific settings |
- | + | * Design choices | |
- | Electroplater: | + | * Position |
- | * Clean with IPA and a TexWipe before beginning processing. | + | * Cleanliness of the laser lens* |
- | * If you would like to adjust | + | * Level-ness of the floor* |
- | * Do not let your substrate sit in the bath (any bath) for very long after the timer runs out. | + | * Level-ness of the sample plate* |
- | * If the machine throws an error on startup, it’s likely a bath needs to be topped off. Get a PI to help. | + | * Filter cleanliness* |
- | * After bath 3 (activator): | + | * One way to minimize systematic errors from the laser system itself is to do what might be termed a "dose test". This would involve make a very small design that has one or more features at and/or around your actual design' |
- | * Swipe a “reasonable” amount off with squeegee | + | * Another suggestion for the laser would be to define a metric for etch quality using the aforementioned test design. That way, you can quantitatively determine which parameters are doing better than others. |
- | * Dry for 20+ mins at 150F. (Higher than this can cause the ink to bake into the copper.) | + | * For the laser, if you're using a substrate thinner than 5 mil (0.125mm), tabs in your design are a near-requirement! You can make them in the laser. |
- | * When rinsing after drying (after “bath 4”), scrub the copper surface with a sponge to remove as much of the dried activator off the copper as possible. | + | |
- | * Bath 5: | + | |
- | * If the current drops to zero or is very low (<10A reverse): | + | |
- | * First attempt to re-seat the PCB holder (i.e. take PCB holder out and put back onto pegs) and try again. | + | |
- | * If that doesn’t | + | |
- | * Don’t forget | + | |
- | * After final bath, dry for 20+ minutes | + | |
+ | [[pcb-book-of-kane|The Book of Kane]] |