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Unfortunately, there are sellers out there that don’t lab-test their eclipse viewing products, and worse, some sell outright fakes. In order to be 100% positive that you’re using a safe solar viewer, you must purchase your eclipse supplies from a reputable eclipse store. Since the ‘90s, we’ve worked closely with the organizations that set safety standards—we even helped to create the safety standards—so purchase any of our eclipse viewing products with 100% confidence.

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All of our eclipse viewing materials are optical density 5 or greater and are "CE" certified, which meets the transmission requirements of scale 12-16 of EN 169/1992. They also meet the standard for ISO 12312-2:2015. Lenses are made of our exclusive scratch-resistant optical density 5 black polymer'' material that filters out 100% of harmful ultraviolet, 100% of harmful infrared, and 99.999% of intense visible light. These premium filters create a sharper orange-colored image of the sun.

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You can ONLY stop using eclipse viewing products when the sun is completely blocked by the moon. This is called the full totality phase. Even if the slightest amount of sunlight is showing, viewing with unprotected eyes can be very dangerous.

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The solar eclipse viewer glasses arrived in a couple of days. Ordering the glasses and then getting them at home was such an easy process. I was happy to have them in time to watch the eclipse. Thank you.

We can see that this is composed of elements from the earlier image. We find these in practice most often in toolchangers like Joshua Vasquez:

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Picking an appropriate machine layout is probably one of the first things we do when thinking of a new machine: this is basically âin what order do the axes bolt on to one anotherâ and there are a few prototypical forms we can see to get oriented:

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If we need to (typically only when we have rotary joints) we can formulate a machineâs kinematics in terms of homogeneous transform matrices or HTMs - here, from some âgroundâ reference space (or world coordinate system WCS) we can express each subsequent axis location as some multiplication of HTMs.

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So: a bit subtle, kind of boring, and easy to ignore, but careful kinematic design is what can make your machine glide like this:

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We can also think about structures has having DOF, i.e. in the case of unstable (underconstrained), stable (well constrained) and indeterminate (overconstrained) frames. In a sense, structural stability and kinematic constraint are one and the same.

Thereâs a few ways to skin the 5ax cat, and debate as to which is best. For a five axis machine, we essentially have all of the DOF we might need to machine any geometry (as the 6th axis, rotation along the axis of the spindle, is redundant), but varying layouts offer varying stiffnesses & âreachabilityâ - how easy it is to manouver the tool onto i.e. the underside of a work piece. Part fixturing here also becomes important!

A 6 DOF robot arm can hold any âposeâ (3 positions, 3 rotations) with only one joint solution (actual orientation of the arm), but some newer arms include 7 DOF, such that they can hold any pose while retaining a ânull spaceâ where the robotâs joints can rotate through a range of possible orientations that still maintain the end effector pose. This allows the robot arm to be moved out of the way of obstacles in itâs working environment while maintaining position of the end effector:

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Most kinematic mounts are low stiffness because points of contact are meant to be vanishingly small (of course in practice they never are, and Hertz Stress is where to start to understand why) and so we rarely see kinematic mounts used in high-load applications like CNC Milling.

These are typically âwide and flatâ and prioritize XY traverse speeds. They are typically about the same size as their working volumes, making them suitable for large format machining of (i.e.) 4x8â stock or longer. Stock material are typically sheet-like.

These are everywhere, and typically used for material handling / âgeneralizedâ automation. They are long forward-chains of rotary transforms, ang gearboxes / actuators capable of producing enough torque (at low enough weights) remain expensive.

But when the motors are on, this is perfectly constrained. If the Y-Left assembly and Y-Right assembly were identical, Clank would be over-constrained. Itâs worth noting that if we were to write a suitable controller for Clank, we could control this slight rotation in the XY plane of the Y axis: the machine has âthree axisâ but four motors: using differential drive on the Y-Left and Y-Right motors would allow use of the âlooseâ DOF here. In practice, the motors simply mirror one another.

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The VMC is a classic workhorse, and not insurmountable to build in the lab. See this youtube channel to see a homebrew, 700kg epoxy granite build.

I think I only have time for one of these examples, but itâs the most common: if we consider a gantry machine with two Y Axes, like clank:

I wasn't in the path of totality, but I brought some in to work. Almost everybody had a turn looking at the eclipse and it was amazing to see! The viewers worked perfectly!

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These are the modern cousin to knee mills. Notice the large cantilever on the Z Axis: these are typically large machines w/r/t their build volumes.

Kinematics is not just about couplings. One way to think of this: each of our Transform Matrices have one âlooseâ or unconstrained DOF: the degree of freedom that is actuated at that junction. Kinematics is about precisely constraining all other degrees of freedom in the matrix without âbinding upâ the free DOF.

Aug 14, 2020 — It only brings up ones that are between 6-8" long, and a relatively short end. Looking for 11" long on the long side, 4" long on the short side.

Most importantly, this design means that the left-side Y rail and right-side Y rail do not have to be perfectly parallel - because the Y-Right assembly has no X constraint, the rail on this side can âwanderâ without causing two X-Constraints to fight with one another.

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We typically become acquanted with this idea through kinematic couplings that precisely constrain one rigid contact between two bodies, along all 6 DOF. Slocum has done a review on these in 2010, where this image is from:

Our handheld viewers and solar eclipse glasses both perform the same function, so it simply depends on which style you prefer. Viewers are great for passing around in a big crowd or for kids, and glasses offer hands-free convenience.

âScaraâ arms are two or three-DOF (adding Z) machines typically made for rapid motion: the rotary linkages are lighter to swing around than heaving large axis over the same work space. In addition, they have small footprints relative their work area.

While machine layout is blatantly obvious, the way a machineâs kinematic constraints are worked out is often more subtle. Understanding kinematic constraint can make a world of difference during machine design, but it is often overlooked.

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There are infinitely many variations on machine kinematics, like I said earlier these lists are not extensive. We can do better with our time to try to understand some of nuance that might appear as we design these things.

I used this to view the April 2024 Eclipse and they provided excellent protection as well as visibility. They shipped promptly and arrived in perfect condition.

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There are others who do a better job at this than I can, so I would point us towards this pdf from the University of Arizona.

My own toolchanger is also a kinematic mount, although itâs a bit unconventional (made for ease of manufacture & actuation) you can track that project here.