Tip of the day ...lol...Screwing a bolt into plastic

"As I assembled it I recalled what an old friend once told me. He does a lot of electrical panel work. He said if you have to screw a bolt into plastic or a soft material screw it backward at first until the bolt thread drops into the other thread and them tighten it. Otherwise it could get cross threaded really easy. I wish I had known that when I was a kid and installing BiJur metering units into white metal manifolds... G- Day :)"


When I worked in medical equipment maintenance and repair, most cases were plastic assemblies held together with course metal "plastic" screws. Over the years we disassembled and reassembled tens of thousands of cases with up to a dozen screws each. Reversing the screw until it quietly "clicks" were the only way to keep from damaging the threaded holes.
 
I use stepped drills for soft and thin material, it won.t pull into the material like a regular bit
 
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