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
Excellent mirror design Keith very jealous you can do this stuff !
Having tried the idea with glass precut mirrors making my own mirror drums there's lots of ways it can go wrong ...your test is right to test that each mirror is over lapping the laser line's .
i am seeing a wobble from the mirror drum housing i found sticking any thing like this on a motor shaft you tend to get the same results ...may be if the length thickness of the mirror drum housing were thicker it would perhaps rotate truer .
So i am not so much thinking its your mirror drum as more its attachment system to the motor shaft .
I would use either a vcr head or use it on it a laser printer polygon motor both are very accurate then you would know if it were your mirrors being off or not .
Some thing you are not doing and is a no no is trying to glue a mirror to a flat surface no matter how little glue you use you will always get the same result each mirror will be off a touch so i really like your design...don't give up i think you are on a winner /