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1) why would you use these instead of acrylic balls?
2) why would they be easier to mount?
3) why would they be safer than balls?
harry dalek wrote:
I have these handy and free easy to get .
Because Gary they have a beveled edge and the end of them if thats the right word ......a stopper.. drill right and its in place.
Well balls would slide either way if the holes not 100 % could go flying ,i think it would be hard to work out a balls middle position right......due to the shape of the led and the stopper you know its end even if you have drilled and its a bit loose due to the beveled edge that could be glued easier than a something round.
But modifying them would be time consuming with no guarantee of optical accuracy. Also, down the track you may need LEDs and have to go and buy them.
optically accurate acrylic balls can be had, even in Australia where everything is 5 times the price of anywhere else, for a few cents each. If you buy them from the US they are, well about 5 times less if not more.
Drill right and a ball is in it's place - I don't see how a bevel would help - in any case how would you remove the guts of the led without destroying the optical integrity?
The balls don't move because you make the holes slightly undersized.
It is easy to make the apertures slightly undersized such that the balls fit in snugly - they are perfectly sized. You simply step out a hole with successively larger drill bits until you find a snug fit and then you use that as your final dill bit size - easy peasy. I don't use that method because I can CNC them.
No one I know of who have used them have ever had a ball fly out of it's own accord.
I was only joking Gary about the spider story you told me once i always remembered that sort of put me off lens disks ...i was thinking must get safety Glasses if i ever try .You don't want to use glue because it invariable will get on the optical part of the lens and ruin it.
I was only joking Gary about the spider story you told me once i always remembered that sort of put me off lens disks ...i was thinking must get safety Glasses if i ever try .
gary wrote:I was only joking Gary about the spider story you told me once i always remembered that sort of put me off lens disks ...i was thinking must get safety Glasses if i ever try .
But you seem to have forgotten that I had to run a camera lens into it to have that happen - the same thing will happen with the LEDS - perhaps worse.
Unless there is severe physical trauma to the beads they will stay in place.
I just wanted to make it clear that bead disks are inherently safe.
BTW no great skill is required using the method I described - read Doug Pitt's article.
If you can make a nipkow disk you can make a bead disk - in fact I reckon it's much easier because the holes are so much larger no fine drill bits or hacked needles required.
harry dalek wrote:i wonder if Baird had any of he's large lenses come out flying on any of he's tests ...being glass i should think they would of been deadly !
M3DVQ wrote:harry dalek wrote:i wonder if Baird had any of he's large lenses come out flying on any of he's tests ...being glass i should think they would of been deadly !
He certainly did. I believe it fired the lenses out at the walls causing them to exploded into glass shards, then the unbalanced disc jumped free of its mounting and ran around the workshop destroying everything in its path.
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