Model Engine Maker
Help! => Hints, Tips & Tricks => Topic started by: airmodel on June 11, 2014, 05:59:58 AM
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Hi everyone
I recently needed two 35mm holes in perspex. As large drills are expensive I made a boring bar to be held in a chuck. A pilot hole is drilled to stop the boring bar from wandering off center. The boring bar needs to be a neat fit in the pilot hole. I have used this method on aluminium and steel. If used on metals a very slow speed is used and also plenty of coolant/cutting oil are needed to help the cutting action.
The photos and video show how it works. http://youtu.be/Mr6hTa7z_AI (http://youtu.be/Mr6hTa7z_AI)
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Nice job, I have always drilled such holes with a holesaw.
Thor
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Interesting video! I didn't realize that it was so easy to repurpose a microwave oven controller board. :ThumbsUp:
Simon
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I'm with Simon, that's slick!
What are you going to use this on?
John
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Very slick...and a nicely done video too!!
Bill
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Pretty good! The power control could be used for something like a heater where there is a lot of thermal inertia and a slow PWM works fine. The PCB in a broken CFL is quite useful as well, as it will drive a 10-15 watt fluorescent tube more efficiently than old style ballasts:
https://www.youtube.com/watch?v=e7QJQBSBRCw
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I plan to use it on my vacuum cleaner as a blower for my melting furnace. Before I made this housing it was in the open slapped together with live wires exposed. Now I can use it safely without getting zapped!