Electronics > Projects, Designs, and Technical Stuff
My DIY alarm clock finally done
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Edison:
Super work, both from industrial production  :clap: :-+ :clap:
Mr. Scram:
I see you've used metal inserts. I assume they were melted into the plastic, but they look exceptionally clean. Can you tell us more about how you did those?
bfrigon:

--- Quote from: Mr. Scram on January 02, 2019, 10:05:26 pm ---I see you've used metal inserts. I assume they were melted into the plastic, but they look exceptionally clean. Can you tell us more about how you did those?

--- End quote ---

They are press-fitted initially. Then i insert a screw and heat it with a soldering iron until the plastic around the threaded insert starts to melt. After it cools down completely, i remove the screw.

One thing though. The hole dimension required for this #4 threaded insert is 156 mils (5/32"). Shapeways print 3D objects with nylon powder using the SLS process. This can leaves excess material around the edges, so i had to drill the holes to make sure they were the right size.

Also, this type of plastic takes a long time to melt. The trick i found to know when it's hot enough is to wiggle the screw slightly with the iron (btw, i do this step with an old soldering iron). When it starts moving, then the plastic is melted enough. After it cools down, it's really solid.
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