Once you think you are ready to make a purchase, make sure your insurance will be taken by the seller. Do your research too. Some sellers may have legitimate-looking websites but are known for fraudulent claims or poor service.

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Today, for the purpose of checking Ra values, the use of portable, handheld, surface roughness testers are not only economical, but are digital and easy to use. These surface roughness testers are a necessity for any shop floor that receives work with Ra requirements. Then, such values are reported either as Ra values or RMS values. RMS is defined as the root mean square of the Ra values — a calculated value of the average of the average values.

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Skid-type surface roughness testers are common shop-floor instruments. A diamond stylus is traversed across the specimen and a piezoelectric pickup records all vertical movement. Peaks and valleys are recorded and converted into a known value of a given parameter.

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A: RMS (root mean square) is a comparative number as related to surface finishes measured with a profilometer. A fine finish is in the range of 20-40 RMS, a machined finish often is in the range of 80-120RMS, and gritblasted surfaces will be in the range of 400-500 RMS. I compare it to measuring the up and down movement of a diamond stylus as it would slide across the grooves of an old 45 rpm record.

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Anti-reflective lenses are created by applying a special anti-glare coat onto the lenses of a pair of glasses. By reducing glare, the glasses can provide improved vision and less eye strain. They can also have a sleek, almost invisible look to their lenses.

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This feature is especially helpful at night. It has the benefit of making the lenses look almost invisible. It can also be combined with premium lenses, such as photochromic lenses, to improve upon an already quality product.

A Consumer Reports article highlights the complexity of buying eyeglasses. In it, they note that Costco (which sells glasses under Costco Optical) has a high level of user satisfaction and often offers prices that are hundreds of dollars lower than some other organizations offer.

Anti-reflective lenses are glasses lenses that have been given a special anti-glare coating. This allows for improved vision, reduced eye strain, and arguably better-looking glasses by eliminating virtually all reflection from the coated lenses.

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Parameters differ in how they approach looking at peaks and valleys. The most popular parameter is “Ra”. Ra is commonly defined as the arithmetic average roughness. While the Ra parameter is easy and efficient, there are other parameters that can be more specific and useful depending on the application requirements. It is the parameters that enable us to define surface roughness.

Choosing what type of lens to get for your glasses is arguably as important as whether you want an AR coating to begin with. Applying this type of coating to cheap lenses that are likely to break, such as CR-39 lenses, doesn’t usually make sense. Make sure you are applying it to a quality pair of glasses since the coating itself can cost an additional $40 to $150. Sometimes, the options is bundled in with certain lens types.

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For more than 40 years H. James Henning held key technical positions in the forging industry, including as director of technology for the Forging Industry Association, and as president of Henning Education Services, a Columbus, OH, firm specializing in customized education and training in forging technologies.

In all, Jim spent 44 years as a technician, engineer, and supervisor in the forging industry prior to his retirement, including nine years as technical director of the Forging Industry Assn.

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If your insurance will cover the bulk of the cost or you can afford to pay for relatively expensive glasses, there are benefits to using an independent local optical shop or a private doctor’s office. While the prices may not be as low, these places can often offer much better service than larger organizations can.

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Upon his retirement from FIA in 1996, Jim formed Henning Educational Services Inc. There, he filled a problem-solving role for forgers and other manufacturers seeking solutions to process and organizational issues. He shared his expertise on hot, cold, and warm forging, on tool design principles, process and equipment selection, and productivity and quality improvements.

‡No interest will be charged on the promo purchase if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo purchase from the purchase date. The required minimum monthly payments may or may not pay off the promo purchase before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. For new accounts: Purchase APR (interest rate) is 32.99%. Penalty APR is 39.99%. Minimum Interest Charge is $2. APR(s) are accurate as of 05/30/2024. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

It is important to remember AR lenses are one of many options that can be chosen when purchasing your glasses. Since they usually add about $40 to $150 to the final cost, be sure the coating is being applied to otherwise quality glasses. It does not make much financial sense to get a relatively expensive coating on a pair of glasses that may break within the year.

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Importantly, high-index lenses and high-definition lenses often come bundled with an anti-reflective coating at no charge or for a reduced cost. It can be worthwhile to look around for deals if you are already planning to buy a fairly expensive pair of glasses, as many companies will try to entice you with bundles that save you money.

If you frequently find yourself struggling with lens reflections, anti-reflective lenses are a good option. If you can afford the extra cost, there is essentially no downside to them. They can help with seeing more clearly while on the computer, driving, and in the dark.

At the same time, expensive glasses do not inherently equal better glasses. Instead, pay attention to reviews and what type of lenses you are purchasing.

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First, make sure your insurance is accepted at that location. Learn about their return policy and what your options are if the glasses aren’t satisfactory.

Shopping for a pair of glasses with an anti-reflective coating in 2022 is mostly about balancing price with the quality of the product and the services that will be available. Costco is a good option for generally good pricing and quality. On the more expensive side, independent local optical shops or a private doctor’s office can often provide the best service.