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In the world of CNC machining there are usually great
torrents of a milky-white cooling fluid spraying around the
place. This is to keep the part and the tool from
overheating and producing a distorted part or damaging
the tool. CNC machines are also inside enclosures, to
prevent flying metal
embedding itself in nearby humans
and also to confine the aforementioned torrents of
As good as CNC machines can be, they do need supervision,
especially with new projects. An operator should be on
hand to make sure that the machine doesn't continue
diligently moving around it's tool path for an hour after it
lost it's end mill or something. Here lies the problem, while
the enclosure does have windows, with so much milky-
white coolant being sprayed at a fast spinning tool, the
stuff gets everywhere including all over the windows. To
solve this, companies have developed a circular window
that spins rapidly <link>. This means that coolant and bits
of metal that land on the window are flung off by
The natural extension to this idea is to make a pair of
glasses on the same principle. Each lens is circular, and
made of something tough like polycarbonate. Instead of
being driven by a motor in the middle, the lens itself has
gear teeth (Mod 0.6 feels about right) around the edge and
is driven by a powered pinion and rests on 3-5 geared idlers
hidden in the frame. A natural place for the motor is to
align with the temples.
These glasses would have several advantages, now a CNC
operator could get right into the enclosure and get a really
up-close look at the process in complete* safety. Even
better, money could be saved by omitting the enclosure
Other uses include cycling/motorcycling in the rain. For
muddy events perhaps a continuous water feed to the
center would wash off specs of even the stickiest mud.
Obviously motivated by <link>
* There will be a time period where having your face inches
away from a multi kW cutting tool will be safe. The rest is
about expectation management.
Visiport spinning window
[bs0u0155, May 26 2021]
[bs0u0155, May 26 2021]
Clear View Screen
Also used on boats [a1, May 26 2021]
[bs0u0155, May 26 2021]
Rain defelctor for photography
Review of Spintec, imported in the US by InnoVision Optics [a1, May 27 2021]
Schulz line of rain deflectors
some spin as fast as 4500RPM and they're bigger than eyeglass lenses [a1, May 28 2021]
Or go "Full Face" instead of glasses...
Might look weird, but it would work. [neutrinos_shadow, May 31 2021]
||I've seen those on boats also <link>. The Wikipedia article gives
1500RPM as a typical speed, and says they're usually driven by
a motor at the center. How fast do you figure you'd have to
spin your goggles and how big a motor will you need?
||a1. I just found the boat version myself. I can't work out why
a: no one seems to make an edge-drive version and b: if
you're going to have a strut leading to the central motor,
why not add a wiper for double effectiveness?
||I think the advantage is how fast it clears the window. Maybe a
wiper scraping against the window so rapidly would wear out
faster. Noisy too, if it ever ran dry for even a second.
||Another way to clear the window would be to vibrate it with
ultrasound - then you don't need wipers or other moving parts.
Not my idea, I read it in a science fiction story once.
||//How fast do you figure you'd have to spin your goggles
and how big a motor will you need?//
||The lens will be in the order of 50mm, say. That's the size
of the spur gear in one of my 1/10 scale RC cars. Spinning
it at 2000 rpm, with no load is pretty trivial, even at a
20:1 gear ratio, garden variety cheap 130-sized motors
spin at 30,000-90,000 rpm. Although you'd go with a
longer thinner motor like the dirt-cheap <link>. At 0.12A
power draw, that's a full work day for a pair of them from
a single 2200mAh 18650 Li Ion cell.
||//Maybe a wiper scraping against the window so rapidly
would wear out faster.//
||Possibly, although the tighter tolerances and flat surface
would be easy to engineer around. A line of high pressure
air as a barrier curtain would be an alternative. There's
always compressed air in a machine shop.
||I would think the centripungent forces will be somewhat proportional somehow to the diameter of the spinning disk. So a spectacule-sized clearview screen will have to spin x times faster than a window-sized one to have the same affect.
||<link> Found a small edge driven one used for photography.
||The reason no one sells glasses with spinning lenses is
that it's too easy for your hilarious friends to shout
"Look!" and point to your left or right, such that when you
turn your head, gyroscopic forces cause the glasses to fly
off your head and smash to the ground.
||Enough speculation. You just need to purchase two of the devices linked by [a1], mount on glasses frames, perhaps a hat-mounted battery and seal it all in a waterproof casing with your usual prescription lenses and you can experiment.
||As for precession, just spin each lens in the opposite direction from the other one.
||// purchase two of the Spintec devices, mount on glasses
||... and get arrested for impersonating Elton John.
||they're $1750 each. I promise I'll make the glasses as soon as I
have ~ $4k with nothing better to spend it on.
||Seems like the center of rotation wouldn't get cleaned very
effectively. Therefore driving it from the edge doesn't gain
||This seems to me like a very halfbaked idea for corrective
lenses, but I think you might have something here for
protective eyewear, or more specifically, a face shield. If
you make a single center-drive viewport with the axis near
the nose, and the disk roughly the size of the face, there
should be a nice clear area in front of the eyes. Fill in
around the edges to make a full protective facemask.
When using your wet diamond blade to cut concrete, the
water and cuttings splattered on your face mask get
||Confirming [pocmloc]'s point - I've looked at smaller ones and
they do spin faster. Scaling down to bs0u0155's notional 50mm
eyeglass lens might need to go as fast as 10000RPM.
||A head-mounted Dremel could be used to drive this and, as an
added benefit, youd never be without a means to file your nails
||//a very halfbaked idea for corrective lenses,//
||The bi-focals are proving tricky.
||// bi-focals are proving tricky //
||As would any prescription needing axis, cylinder, or
prism corrections. With no astigmatism, just get
the lens strength and
inter-pupil distance right and you're all set. In that
someone needing bifocals might get away with
for near vision and the other for distance.
||Prescription weirdness is simple: a non-spinning lens behind
the spinning piece. The spinning bit could be very thin, and
"overlapping" the edges of the actual (optical) lens, ] shaped
(to keep stuff from getting in between the 2 parts).
||[hippo], I like the way you think. I'm always looking for
alternative avenues for nail filing. Always.