I was cutting a LED light bulb the other day. Cutting the bottom off was a piece of cake. I placed a piece of sandpaper on a granite countertop to make it nice and flat. I ended up drawing a couple of concentric rings on the top to try and find TDC, then used a hole saw by hand slowing turning it until I bored the top. Everything seemed to work out nicely. I was wondering if there's another way of finding TDC without a lathe or mill?
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Top Dead Center of a Sphere(?)
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Originally posted by Dan Dubeau View PostPut a light smear of hi spot on a height gauge scriber and touch off on it. Alternatively you can blue/sharpie up the sphere and rub off the top with the height gauge.
SweetLast edited by Smokedaddy; 01-18-2022, 10:17 PM.
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Originally posted by Dan Dubeau View PostPut a light smear of hi spot on a height gauge scriber and touch off on it. Alternatively you can blue/sharpie up the sphere and rub off the top with the height gauge.
Problem solved, two heads are better than one in this case.
-JW:
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My first thought at seeing the partial globe on the viewing stage was "why is he using a microscope to find TDC? But to my credit that thought only lasted about 0.2 of a second when the "light dawned"....
What a tricky trick to make a nice diffuser! ! You one smart cookie!
Your trick for making the ring around the top is also your method for easily finding the top center. You just needed a taller block. Or with too tall of a block just hang the pen down and pass the globe under it while slowly lowering the pen until you get a few short touch marks on the top. It would have been close enough for government work.Last edited by BCRider; 01-18-2022, 11:32 PM.Chilliwack BC, Canada
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For the intended purpose, a sheet of Rosco or Lee diffusion gel would have worked without going through all the bulb BS?
https://us.rosco.com/en/diffusion-ma...o-applications
Tracing paper or even TP works as a diffusion material for lighting.Last edited by reggie_obe; 01-19-2022, 11:31 AM.
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Still can't figure out what is dead about the center.
I bet no one else has either.
I was thinking just grind a flat on the globe by
holding it against the belt sander. It seems by
how you are using it, micron precision is not needed.
-DDZER
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