Electronics > Mechanical & Automation Engineering

High density connector troubleshooting

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mtwieg:
I looked around our machine shop last night and actually found a tube of Dykem hispot blue. But after seeing it up close, I'm very hesitant to try using it on these connectors/boards (they're effectively irreplaceable for the time being). Wasn't aware that it's oil-based, and it gets everywhere. Just loosening the cap a bit was enough to stain my hands. I'm worried that it (or whatever chemicals I'd have to use to clean it) will affect the plastic body of these connectors. I'll likely need to repeat this several times, removing all of it every time. After searching online I can't find any references to people using this stuff on plastic parts or surfaces.

Going to look around and see if we have any old rev board assemblies or connectors I can test on.

During my searching I also came across an alternative called "Canode" which is supposedly easier to clean, but apparently it hasn't been available for a couple years...

I'm thinking I should just try really simple things like magic markers/paint markers first. Maybe an art supply store would know a more suitable option too...

Doctorandus_P:
The samtec connector shown has built in alignment notches. That means it should probably be the only thing attempting to align the connector halves. Any other guide (such as maybe a slot though wich the daughter cards move) should have plenty of slop so they do not interfere. I guess that >1mm should be the goal.

Maybe you can use some pieces of blue tac, then put some starch or other powder on the outside so it does not stick to anything else, then do a mating cycle and measure the thickness of the left overs.

DiodeDipShit:
That Dykem hispot blue in a tube is greasy stuff. It is strictly machine shop stuff. It allows lubrication for sliding heavy parts when flat sanding for high spot removal.

Do Practice the mentioned Dykem Spray and the spray remover on a suspect connector. The spray lays down controllable thin layer or layers when You pass by quickly. The Spray remover quickly 'washes' the Dykem off in a rain.

Dykem Layout Fluid,Blue,16 oz,Aerosol Can:
https://www.shars.com/dykem-80000-blue-layout-fluid-16-ounce-aerosol-can     ..... $16

Dykem 82038 Layout Fluid Remover & Prep, 16 oz Aerosol
https://www.emisupply.com/itw-82038-dykem-82038-layout-fluid-remover-prep-16-oz-aerosol     ..... $15

For a mere ~$31 +shipping investment, You can't go wrong.

tooki:
FWIW, you should make sure whatever connector you use is designed for “blind mating”. Those are connectors with tapered surfaces, extra alignment pins, or other features designed to make the connector tolerant of misalignment, so that it basically self-aligns as it gets inserted. Remember also that some part of the design has to have the freedom of movement to overcome the alignment tolerances in the individual assemblies. So if you’re using connectors that require x misalignment maximum, and your board assembly allows x misalignment on both sides, you’ve got up to 2x total misalignment. If your mounting holes have 2x or more of freedom of movement, then you can still mate, but if not, you’ll run into trouble. (Some blind mating connectors actually have floating contacts and inserts, so that the connector itself can move to accommodate tolerances.)

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