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Panrock wrote:Viewmaster wrote:For anyone contemplating building a colour mirror screw
(who might that be I wonder? )
See this wonderful site.......
http://www.earlytelevision.org/color_mirror_screw.html
Yes this was one of the first places I went to! You'll see there's mention there of a discussion between me at Steve McVoy regarding how to create a suitable high-intensity colour line of light.Viewmaster wrote:
...........see sketch
I still think another V in the bottom plate would be highly advisable, to locate the bottom of the shaft properly via the ball. I'm minded that the slightest imbalance is a matter of concern, and the whole thing would need to be firmly held, top and bottom, to 'soak up' any transverse forces resulting from imbalance... But knowing me, have I missed something here?Viewmaster wrote:
Steve wrote.......How did you achieve dimensional accuracy on your screw?
Not sure what you mean (hole position on slats or slat angular alignment?)
If the latter see this thread.......
http://www.taswegian.com/NBTV/forum/vie ... rror+screw
AFAICS, you seem to have skilfully made these parts up yourself in the workshop and set their positions manually. I wouldn't be that brave. As regards your clamps, I would have been slightly concerned about 'streamlining' issues. I'm expecting 'wind resistance' (and resulting noise) on my mirror screw to be a bit grim as it is. Another thing, being a screw, will it try to 'take off' - or 'burrow into the earth' - like some sort of Victorian machine?Viewmaster wrote:Another thought...Also if colour will there be 3 rows of LEDs ? if so, will that give some kinda angular problem to the eye position I wonder ?
See Steve McVoy's and my discussion on the page you quoted for more on this.
Steve O
Panrock wrote:A thumping great DC motor will be needed to spin this heavy great thing up to 1500 rpm and regulate its speed.
Steve O
I sort-er imagined using the standard 'club' circuit with a beefed up output stage... a bit like I already have on my 'fork lift truck' Grosvenor monitor and which works very well at about 4 amps. To be beefed up yet more on that I suspect...Viewmaster wrote: What thought have you given to achieving reliable locked sync at 1500 RPM with such a relatively large mass of the mirror screw and the motor rotor combined?
Panrock wrote:An update: I've also done some sourcing on silver steel rod for the 25mm OD shaft and bearings. Steve O
Panrock wrote: I still have to find suitable pulleys and belt though - and the motor.
Steve O
gary wrote:In Steve's case I would have thought that the hardening process would also be the hardest part (no pun intended).
Steve, this is probably teaching grandmother to suck eggs, but when specifying the holes make sure either your specified size or the laser cutter operator (via a specification) takes the laser kerf into account otherwise the pins will drop straight through or will wobble in the hole.
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