开云体育

Building ideas & History The history of navigation dates back to ancient times, with significant developments in various civilizations. The first part Celestial navigation, use of landmarks, and early navigational instruments Celestial Navigation: Ancient navigators used the positions of celestial bodies, such as stars, the sun, and the moon, to determine their position and direction during travel. The North Star (Polaris) was particularly significant in the Northern Hemisphere Use of Landmarks: Sailors relied on visible landmarks such as mountains, cliffs, and coastlines to orient themselves. When landmarks were absent, they used dead reckoning, calculating their position based on speed, direction, and elapsed time Early Navigational Instruments: Tools like the astrolabe, a device for measuring the altitude of celestial bodies, and the compass, which provided a way to determine the direction of travel, were crucial for ancient navigation These techniques and tools enabled ancient sailors to navigate vast oceans and uncharted territories, expanding trade and communication across vast distances Indo-Pacific Navigation: Began with the Austronesians from Taiwan, who spread southwards into Island Southeast Asia and Island Melanesia around 3000-1000 BC. They used tools like star navigation and wave detection to navigate the Pacific Greek Navigation: By the third century BC, the Greeks began using the Little Bear (Ursa Minor) to navigate. They also used circumpolar stars to determine latitude Chinese Compass: In China between 1040 and 1117, the magnetic compass was developed and applied to navigation, allowing sailors to continue their course even when visibility was limited Portuguese Exploration: In the 16th century, Portuguese explorers took the lead in long-distance oceanic navigation, opening a network of ocean routes covering the Atlantic, Indian, and western Pacific oceans. Modern Navigation: The invention of the sextant in 1757 and the chronometer in the late 18th century revolutionized navigation, allowing for accurate determination of longitude and latitude. Open to public after 1983. The Global Positioning System (GPS) was developed in the 20th century, transforming navigation into a modern technological marvel . Flight 007 from Alaska to Japan open up GPS. THE EVENT (Korean Air Lines Flight 007 (KE007/KAL007)was a scheduled Korean Air Lines flight from New York City to Seoul via Anchorage, Alaska. On September 1, 1983, the flight was shot down by a Soviet Sukhoi Su-15 interceptor aircraft. The Boeing 747 airliner was en route from Anchorage to Seoui.) This even that open up GPS TO World

Here few photos of a setup for milling on a mini lathe .

The cutoff blade holder for my lathe came with a missing clamp, I would normally grab a piece of drill rod to make something like that but that was on the other side of the ocean. Here I have to learn all the metals over again as they're similar but different. So, I ordered a piece of 20mm diameter ST20 to make this out of. A simple project, not critical, but will sure make the lathe more useful. I think ST20 is like a typical cold rolled steel that I'd get in the USA, but I'm not sure. Well, as long as it isn't something hard to machine like stainless it should work for this project. I have a place within walking distance that sells steel, called Metal Base. There's also a few more within 5 or so km. But it's all hot rolled. Good for some projects, but I wouldn't want to make a tool clamp out of it. There's a couple of online shops here (Ozon and Wildberries) that are something like Amazon. They carry a wide range of stuff and deliver to pickup points, one of which is across the parking lot from where we buy groceries. So, that's where I'll be getting small quantities of things like this. For larger quantities, I would have to buy from the regional capitol which is 50 km away. Either drive there or pay high delivery costs. I think I'll stick with Ozon for now. There's also a few scrap yards around here, I need to visit them more. Maybe I'll find some good stuff for the projects bin.

Clamping an angle plate or stop in place. Bill in OKC William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement. SEMPER GUMBY! Improvise, Adapt, and Overcome. Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in one hand, expectorate in the other. See which one gets full first. On Friday, February 14, 2025 at 10:49:50 PM CST, davesmith1800 <davesmith1@...> wrote: Any know how this tee slot use for ? It about Suze if a #6 screw Dave

That may be a standard steel shape that they just buy off the shelf. Like extrusion profiles, only machined. On 15-Feb-25 7:49, davesmith1800 wrote:

When the GPS goes because of sun spots or a country does knock gps. The NAVY is back the old way the sextant. NAVY is back to teaching using the Sextant. This looks like a navigation system for today's Aircraft Carry. Better something we can build on a mini lathe and shop Dave