Applied Science

A complete guide to making high-resolution screen prints with minimal tools. Notes: When applying film emulsion to the screen, the matte surface should face the screen. The glossy surface is the plastic backing, which is removed later, just before exposure. The resolution test shown in the video actually indicates line width, not pitch. So, the 1mm sample has 1mm lines and 1mm spaces. Thus, the pitch is actually 2mm. The Nazdar paint instructions say there is a 30 minute "induction" period that is needed for the catalyst to start working. Nope. Just weigh out the paint and catalyst, mix, and immediately apply to the screen. Print the needed items quickly, and clean it off the screen as soon as possible. Use disposable mixing cups / tools. It is *messy*! If your emulsion is not sticking to the screen, even with very long exposure times, it probably isn't dry. The green film may seem fairly dry after a few hours, but adhesion during the wash out process will be poor until it is really completely dry, then exposed. Shopping list: Pre-stretched screen: https://www.mclogan.com/shop/aluminum-12x17-p-1173-c-293_297_379_3.html Squeegee: https://www.mclogan.com/shop/squeegees-per-inch-durometer-p-5-c-293_297_1_4.html Epoxy paint: https://www.mclogan.com/shop/nazdar-ade-series-epoxy-screen-ink-p-1145.html Paint cleaner: https://www.mclogan.com/shop/mclogan-graphic-press-wash-p-156.html Emulsion remover: https://www.mclogan.com/shop/mclogan-emulsion-remover-concentrate-p-149-c-187_42_44.html Degreaser: https://www.atlasscreensupply.com/store/p/163-ICC-858-Stain-Remover/Degreaser-Quart.aspx Film emulsion: https://www.atlasscreensupply.com/store/p/772-DuraCap-11-x-14.aspx Vellum paper: https://www.amazon.com/Office-Depot-Premium-Translucent-Vellum/dp/B014SBHGMQ/ Consider using 365nm LEDs instead of fluorescent tubes for exposure. https://www.patreon.com/AppliedScience

I use a deuterium light source to determine the absorption effectiveness of UV safety glasses and sunscreen, as well as common transparent materials. Another interesting application of sunscreen, UV, and visual indicators: https://www.youtube.com/watch?v=h8VJft5Xq5g References for CIE erythema action spectrum: https://en.m.wikipedia.org/wiki/Ultraviolet_index http://sci-hub.tw/10.1039/C1PP05271C https://pubs.rsc.org/en/content/articlelanding/2012/pp/c1pp05271c/unauth#!divAbstract https://en.wikipedia.org/wiki/Deuterium_arc_lamp https://en.wikipedia.org/wiki/Emission_spectrum#Radiation_from_molecules http://www.aseq-instruments.com/ https://www.ebay.com/itm/Fused-quartz-glass-plate-50mm-x-50mm-x-1mm-2-pieces-Free-Shipping/123634196683 https://www.amazon.com/gp/product/B001RKFZPC/ https://www.patreon.com/AppliedScience

An electro-osmotic pump is an unusual and interesting way to pump fluids and also measure their flow rate with only an electric field (no magnets). Refs (in order of relevance) https://sci-hub.tw/10.1016/S0039-9140(99)00320-3 http://micromachine.stanford.edu/~dlaser/research_pages/electrokinetics_and_eof.html https://www3.nd.edu/~changlab/documents/Youcef.pdf https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2756694/ https://psec.uchicago.edu/library/photocathodes/SiO2_OH_model.pdf https://www.patreon.com/AppliedScience

I show how to build an EDM drilling machine, describe how it works, and where to buy parts. Source for the arc generator: https://baxedm.com/ BaxEDM YouTube channel: https://www.youtube.com/channel/UCy4kgsAYxcraee8w5SfqXPA/videos I used the Kflop, Kanalog, and Kstep from https://dynomotion.com/ OpenBuilds CNC machine: https://openbuildspartstore.com/openbuilds-sphinx-55-20-x-20/ EDM hollow drill rods: https://www.ebay.com/itm/EDM-WIRE-MACHINE-DRILL-0-60mm-1-CERAMIC-GUIDE-30-SINGLE-HOLE-BRASS-TUBES-EDM/161395647605 EDM drill head: https://www.aliexpress.com/item/EDM-Rotated-Head-for-Small-Hole-EDM-Drilling-Machine/32353532977.html EDM drill head seals: https://www.aliexpress.com/item/Rubber-Seal-for-EDM-Small-Hole-Drilling-Machines/789294397.html Airless paint sprayer: https://www.amazon.com/gp/product/B004Z2090U Water filter: https://www.amazon.com/gp/product/B01CFOFZ08 Cartridges are cheap, similar to this: https://www.amazon.com/dp/B01FKNK69G/ https://www.patreon.com/AppliedScience

How to build a replica DSKY unit using an electroluminescent driver circuit and screen-printed conductive ink. Source code, PCB files, screen print graphics, etc: https://github.com/benkrasnow/DSKY_EL_replica Other folks in the community have been working on authentic DSKY replicas, notably, Fran Blanche: https://hackaday.com/2017/05/29/re-creating-the-apollo-dskys-display/ https://youtu.be/hiqibWP2WNA?t=647 https://www.patreon.com/AppliedScience

Laboratory synthesis and systematic testing of a corrosion inhibitor commonly found in engine oils. This inhibitor is the reaction product of 2,5-dimercapto-1,3,4-thiadiazole and oleic acid. Source of recipe: https://patents.google.com/patent/US4193882 Water fogger: https://www.amazon.com/gp/product/B00TN5EUUE/ Source of DMTD: https://www.amazon.com/TCI-America-Bismuthiol-B0593-25G-95-0/dp/B0727V9DQY/ Oleic Acid: https://www.amazon.com/gp/product/B01BLUTRO2 https://www.patreon.com/AppliedScience

Testing myths about gas inside tennis balls. Note: I should have added that all of the gases tested would have the same bounce height in a perfect no-loss system. The reason that SF6 bounces higher is because it heats less during compression, lowering the amount of possible thermal loss. Argon heats more during compression, and can lose more energy because of thermal transfer from the gas into the cylinder walls, where it is not restored upon decompression. Things are more complex in a tennis ball, though: Most of the losses are in the rubber shell, and not in the thermal dissipation of the fill gas. It's hard to estimate, but I'd say that the highest fill pressure, with a high-gamma gas would prove to be the most bouncy since it would cause the rubber shell to deform the least. The amount of compression in a tennis ball is very low, and any effect due to the gamma of the gas will be extremely small. Fill pressure will have a dramatically bigger effect. Google drive link : https://drive.google.com/open?id=10gktbl7YQve5IKNAak1L0wIS_g_4BVEW Nike Air: https://news.nike.com/news/nike-air-max-sustainability EPA SF6 use: https://www.epa.gov/sites/production/files/2016-02/documents/conf00_smythe_paper.pdf 100 kg load cell: https://www.amazon.com/gp/product/B077YHNNCP/ Instrumentation amplifier: https://www.ebay.com/itm/INA114-Instrumentation-Amplifier-Module-1000-Times-Gain-Adjustable-Single-Supply/272973857983 SF6 on eBay: https://www.ebay.com/itm/Sulfur-Hexafluoride-SF6-18-lb-Tank-New-full-cylinder-Insulating-Gas-SALE/283464688564 Tennis ball patent: https://patents.google.com/patent/US4358111 SF6 data sheet: https://npeinc.com/manuals/General%20Electric/GEBK-IBvendor/ALLIED%20CHEMICAL.PDF SF6 worldwide usage: https://www.ipcc-nggip.iges.or.jp/public/gp/bgp/3_5_SF6_Electrical_Equipment_Other_Uses.pdf General adiabatic resources: http://rogercortesi.com/ideas/public/gasspring.html https://arxiv.org/pdf/1708.01282.pdf http://isjos

Ordinary printer paper is darkened by a high power UV laser, and then the affected area disappears in four minutes! This is caused by fluorescent brightening agents that are added to printer paper, which are temporarily overloaded by the intense UV light. It seems that oxygen plays a role in this, as hydrogen peroxide applied to the marks cause them to disappear instantly, and prevent them from being formed again by the laser. Performing the experiment in argon appears to slow the disappearing ink effect. https://en.wikipedia.org/wiki/(E)-Stilbene http://abchemitrans.com/dokumenty/Brochure_OPTICAL_BRIGHTENERS.pdf https://www.tandfonline.com/doi/abs/10.1080/19440049.2014.934302?mobileUi=0&journalCode=tfac20 https://patents.google.com/patent/US20140339462A1 https://www.patreon.com/AppliedScience

I bought some HSS stub drills, and treated half of them with liquid nitrogen, which improved their wear resistance dramatically. I also look at the change in microstructure with an electron microscope. Performance of cryogenically treated M35 HSS drills - http://sci-hub.tw/10.1007/s00170-011-3616-8 Performance of cryogenically treated HSS tools - http://sci-hub.tw/10.1016/j.wear.2006.01.017 Effects of Cryogenic Treatment on the Strength Properties - http://sci-hub.tw/10.1088/1757-899X/229/1/012014 LN2 generator video: https://www.youtube.com/watch?v=7PWESWqhD8s Heat treatment of steel video: https://www.youtube.com/watch?v=ulfCxDsVTWo Source of drill bits: https://www.mcmaster.com/catalog/125/2508 Temperature logger (discontinued, unfortunately): https://www.adafruit.com/product/3081 3M fine polishing pads: https://www.amazon.com/Tri-M-Ite-Polishing-Abrasive-Assorted-Sheets/dp/B07CP9CCH4/ Delorean patent on cryogenic torsion bar: https://patents.google.com/patent/US4378658 Steel grain structure inspection, and overall great channel for material analysis: https://www.youtube.com/watch?v=UuHofNW40Yw Steel grain structure video: https://www.youtube.com/watch?v=0SIr2sBHxA4 Applied Science on Patreon: https://www.patreon.com/AppliedScience

Teardown of a "date back" or "data back" camera and description of how it works: A micro LCD projector with incandescent light bulb! https://www.patreon.com/AppliedScience

How to build and operate a simple mass spectrometer. Please ask questions in the comments, as always. (I had to re-upload this video to fix the ending --I'm very sorry if your early comments were lost!) Scientific American article: https://www.scientificamerican.com/article/the-amateur-scientist-1970-07/ $7.99 is a good value for the entire back issue in plain PDF format, and an example of a publisher being reasonable. I'm happy to support this. Original Dewdney paper: https://sci-hub.tw/https://doi.org/10.1119/1.1969211 https://en.wikipedia.org/wiki/Isotopes_of_potassium https://en.wikipedia.org/wiki/Ionization_energy https://en.wikipedia.org/wiki/Thermal_ionization https://en.wikipedia.org/wiki/Gyroradius https://www.patreon.com/AppliedScience

A new technique to make graphite air bearings without precision tooling. I show how to make spherical, cylindrical, and flat bearings that are also vacuum pre-loaded, meaning the bearing is captive. David Preiss' excellent video: https://www.youtube.com/watch?v=vuzoEe_ykmM 10mm thick graphite sheet: https://www.amazon.com/Graphite-Smooth-Polished-Surface-200MMx100MMx10MM/dp/B07S2RDQ6P 2" ball bearing: https://www.amazon.com/Inch-Chrome-Steel-Bearing-Ball/dp/B0074VCP8S Small 10-32 hose barb fitting: https://www.mcmaster.com/5047k11 Linear bearing shaft: https://www.mcmaster.com/6061k35 Fusion360 CAD files: https://drive.google.com/drive/folders/1fj6zJ9GlZ07WB6jVrltPNsvqsU06qTAP?usp=sharing 12x18 granite surface plate: https://www.amazon.com/gp/product/B01LWBEEH8 Applied Science on Patreon: https://www.patreon.com/AppliedScience