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Showing 1 of 262 conversations about:
svander
63
May 15, 2016
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Got mine today. Already getting 9 minute spins on a concave lens I got from Amazon.
Royalpig180
107
May 15, 2016
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svanderCould you link to the lens you bought? Which bearing is yours?
Amafan
215
May 15, 2016
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Royalpig180This one is similar if not identical to the glass lens that comes with the Spin Station. I'm thinking of buying one if something happens to mine.
http://www.amazon.com/Optical-Double-Concave-Diameter-Length/dp/B00CLC7V5C/ref=sr_1_2?s=industrial&ie=UTF8&qid=1463350090&sr=1-2&keywords=concave+lens
svander
63
May 16, 2016
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Royalpig180I have the ceramic bearing. Here's the glass lense I have: Eisco Labs Optical Glass Lens, Double Concave, 75mm Diameter, 20cm Focal Length https://www.amazon.com/dp/B00CLC7V5C/ref=cm_sw_r_cp_api_rFtoxbCQR5BAM
crainger
314
Keyboard Club Member
May 16, 2016
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svanderThat's the one I ordered. :)
In the mean time getting some good results from an upside down espresso mug. Maybe 4-5 min, but I've only been spinning since today.
Desastor
336
May 27, 2016
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svanderAlthough I know little about optics, I would assume that the shorter the focal length, the more concave the glass, which means that there is a steeper angle from edge to center. I have a mirror with a short focal length and it is so much more difficult to get long spin times as the top loses a lot of power travelling from the top of the edge back down to the center, back toward the edge and so forth (unless you spin so exact that the top always stays in the center). I believe that longer focal lengths, (50 mm or longer) would be better. I have a mirror w/a large diameter & only mildly concave; on it the top just spins absolutely mesmerizing. On my smaller, much more concave mirror, the top moves so erratic you think its on crack. How much time do you get out of your spins on that lens?
thanatos76
1
May 29, 2016
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DesastorHi, where did you buy that mirror with mild concave? Is there a specific angle of the concave for best spins?
DirkG
42
May 29, 2016
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thanatos76I used a very cheap double sided shaving mirror... :) Works like a charm.
Desastor
336
Jun 8, 2016
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thanatos76I got mine at Target but its also available at CVS. Look for focal lengths if that is one of the specs offered. The longer they are, the less concave you got. Or, look for the least magnification you can find, like a 2x. You can also purchase concave optical lenses at Ebay or Amazon but usually they are rather small in diameter, like 2 or 3 inches. Although I have not found the balls to spend $150 on a precision cosmetic mirror, they are out there and are perfect for long spins since they are large w/long focal lengths on one side and highly concave on the other. If you're near a university, you may want to talk to folks in the optical department or their surplus if they have one. I have come across some amazing equipment I was allowed to take for either a Pizza or a small purchase. If I would have the room, I would have picked up a granite slab polished to a mirror sheen that they used for calibrating land and space based telescope equipment. Just keep thinking outside the box and you'll eventually find something that will make your top spin. It just has to be extremely smooth and plain, while concavity is an added plus.
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