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  • KeithAZ commented on Left-field Designs's instructable DIY Self-Locking Nut2 months ago
    DIY Self-Locking Nut

    Here is a great read... if anyone is following that cares about the do's and don'ts with sparks plugs https://www.pepboys.com/car_care_corner/do_it_your...

    Here is a great read... if anyone is following that cares about the do's and don'ts with sparks plugs https://www.pepboys.com/car_care_corner/do_it_your...Spark plugs I've seen blown out of the cylinder are due to the forces of the combustion chamber overcoming the retention of what the threads should hold... or well, any of those "Don'ts" are done. It's hard to say " not causing the problem myself" what exactly happens to the cars I've had to "heli-coi"l or re-sleeve but most times I've seen more than half the threads just ripped right out and the spark plug is dangling by the wire boot or somewhere on road.

    I've seen plenty of the older aluminum heads from cheaper cars fail... Usually happens when people re-used the old spark plugs that has a hollow collapsing washer.

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  • KeithAZ commented on Krest's instructable Dead Space Welding Helmet5 months ago
    Dead Space Welding Helmet

    Awesome work of Art!

    Arc welding i would be most concerned doing inside top corner welds... above your head. Is there a fire retardant foam we could use?

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  • KeithAZ commented on Donald Bell's instructable Make Beautiful Solder Joints5 months ago
    Make Beautiful Solder Joints

    This is a setup for disaster, sorry. Sure it is pretty and nice to the touch. But that's not the point for functionality and longetivity of a proper solder joint. Firstly the "mountain of solder" shouldn't look like that, it should be almost concave or even sloping from the outside of the pad to the top, to visible show wetting took place. A mountain is a sure sign of a cold joint. Clipping the lead then shocks the joint and could fracture your weld, but as you should know a cold joint already has fractures and can fail. Then adding a dab of solder over that hides the mistake already present and with a properly heated joint they would not bubble like that, another sure sign of child joint. This is also hiding the lead you are wanting to make sure it's in that connection (...

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    This is a setup for disaster, sorry. Sure it is pretty and nice to the touch. But that's not the point for functionality and longetivity of a proper solder joint. Firstly the "mountain of solder" shouldn't look like that, it should be almost concave or even sloping from the outside of the pad to the top, to visible show wetting took place. A mountain is a sure sign of a cold joint. Clipping the lead then shocks the joint and could fracture your weld, but as you should know a cold joint already has fractures and can fail. Then adding a dab of solder over that hides the mistake already present and with a properly heated joint they would not bubble like that, another sure sign of child joint. This is also hiding the lead you are wanting to make sure it's in that connection (good luck finding a problem you can't see). Last on this rant stop "touching" your electronic boards you're mentioning this practice to touch? Repeatedly? I can't get over the years of ESD training and standards i have learned while in the electronic manufacturing industry.

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  • AT Command Mode of HC-05 and HC-06 Bluetooth Module

    Thank you for the tutorial! I had trouble at first (fighting my own stupidity) not leaving the KEY pin HIGH all the time, during AT mode leaves you with maybe just read access AT Commands. Without your tutorial I would have probably been stuck for a much longer time

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