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Robonz wrote:I had a go at making a polygon mirror today for my next mechanical TV. It did not come out true enough. It does look good though haha.
Enjoy the video of my fail and please give some contructive ideas on how it might be made much more accurately especially if it uses a laser cutter
Cheers
Keith
Robonz wrote:Anyway I have solved the wobble by putting a 4 point adjustment on to the hub. It seems to work really well. It has rubber wahsers that I laser cut that make a compression spring arrangement. Here is a video and some photos.
Robonz wrote:Hi Harry
I just tested the surface with a laser at 45 degrees and I only get 1mm of wobble 30 cm away so that meets my spec. At 10 to15 cm that's only 0.3 to 0.5mm of wobble. And I have not tried hard to adjust it well so I can probably do better.
The question is, can I laser cut a mirror drum to mount on this with good specs. I will do that experiment next. If that fails I intend to surface grind some 5mm stainless steel. I hope I do not need to.
The motor is intended to run at 5000 rpm for 60 lines at 25fps.
Cheers
Keith
Andrew Davie wrote:I'm sure there are better/easier ways, but this is how the ancient greeks would have made their 18-sided mirror drum
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