New ways vs Old ways CNC vs manual

[SmithDoor]

Remember when needs the let's use the Sextant with helper.

It work 200 years still works today

Dave

 

[Richard Hed]

Sounds like you where in Construction at one time .

Dave

Well, a bit of construction. I designed our house in Phils, and supervised the construction. I learned a whole lot. It's hurricane proof, earthquake proof, flood resistant, and bullet resistant and bomb resistant. The last two items NOT a priority but the first three extremely important. It is also built with a basement which is generally about 10-15degrees cooler than upstairs.

 

[SmithDoor]

I had difficulty finding the sun when I used the sextant - once - when in the Navy.
Decca navigator was dead easy though! Radar over the horizon was difficult to interpret if it didn't see houses or cliffs on the coastline, but only hills and mountains beyond? Dead reckoning was OK for the ship through water, and tidal flow, but wind drift was bit of a sod to estimate! And recognising your position on a strange new coastline was difficult, so we sailed to aim 25 Km North of the port (inlet or river mouth) so we knew which way to turn when we reached the coast. (South). - it was 35 miles South, so we would have hit the coast and been just out of sight (a bit foggy, 2 mile visibility) and not known which way to turn if we hadn't aimed further away than predicted error by a good chunk. Like reducing machine cuts when approaching size!
I Stuck to engine room stuff. Easier to understand big blown 2-stroke diesels!
K2

Try this 3 to 4 inch sextant.

View attachment 1643

36[/ATTACH]

 

[SmithDoor]

⫷⸻❋ project ❋⸻⫸​

.
It would hard for any to build a GPS now looking at Sextant looks easy to me when break down.
Theis group of Sextant is size for most shops

What do you think ?

Here a few pocket Sextant from 3" to 4" dia.
Note the peep sight used
The VENEER is in minutes
Note some photos are dup. [/B] [/size]

Note the handle has a flat so does not turn in hands.

This is mostly in closed and the veneer..

Not finished

 

[Richard Hed]

⫷⸻❋ project ❋⸻⫸ ​

.
It would hard for any to build a GPS now looking at Sextant looks easy to me when break down.
Theis group of Sextant is size for most shops

What do you think ?

Here a few pocket Sextant from 3" to 4" dia.
Note the peep sight used
The VENEER is in minutes
Note some photos are dup. [/B] [/size]
View attachment 164351

Note the handle has a flat so does not turn in hands.

View attachment 164353

This is mostly in closed and the veneer..
View attachment 164354
Not finished

Wish I had some of those, even tho' I have no use for them.

 

[SmithDoor]

Wish I had some of those, even tho' I have no use for them.

I have never use too.
What found is make for every day year.
Then subtract from number in book now have the Latitude
Longitude is a reverse of a sundial and a watch aka chronometer.

Some internet sites i found took 10 pages to say that.

Dave

 

[SmithDoor]

A 3" Sextant with a veneer to 1 minute can find your self on earth .

Calculation for one minute on earth .

Earth circumference 24,500 miles

Calculation 1
(1/1) 24,500. ÷ circumference
(1/2) 360. =

degree in miles
(1/3) 68.0555555556 ÷ one
(1/4) 60. =

one minute in miles
(1/5) 1.13425925926 ÷
(1/6) 60. =

I think good for something we build in shop.

Just picture your self on a boat where you built the engine and then in your pocket a sextant you built finding your location in 1.4 miles on earth .

I think that is amazing what we can do with out computers.

How do you feel about your talent and skills today?

Dave

FYI
one second on earth in miles
(1/7) 0.018904320988 ×
(1/8) 5,280. =
feet one second in feet on earth
(1/9) 99.8148148148

 

[SmithDoor]

Wish I had some of those, even tho' I have no use for them.

I was surprised over just table .

Now if could only hold the sextant to a second. Lucky hole to 30 minutes . The next is try hole to a minute. Next is a very good watch.

I have a theodolite to 20 seconds is closest I have come to a sextant.
On ship I have been on ship is a ferry ⛴ in Washington state to Canada .
Did get see engines room.

Aircraft I can use a radio compass I spent a lot time flying ✈.

How about you ever use a theodolite/transit maybe a radio compass?


Dave

 

[Richard Hed]

I was surprised over just table .

Now if could only hold the sextant to a second. Lucky hole to 30 minutes . The next is try hole to a minute. Next is a very good watch.

I have a theodolite to 20 seconds is closest I have come to a sextant.
On ship I have been on ship is a ferry ⛴ in Washington state to Canada .
Did get see engines room.

Aircraft I can use a radio compass I spent a lot time flying ✈.

How about you ever use a theodolite/transit maybe a radio compass?


Dave

Never used any but it would be fun to learn how

 

[SmithDoor]

Never used any but it would be fun to learn how

Come over I have a theodolite and have used it lot .
It lot fun
I purchased a theodolite because the veneer is 20 seconds. I could turn corners of a build , upper door tracks and setting columns.
How build Hight, telephone pole Hight and locating the North start
The list just goes on.

I am here Clovis California

Dave

 

[Richard Hed]

Come over I have a theodolite and have used it lot .
It lot fun
I purchased a theodolite because the veneer is 20 seconds. I could turn corners of a build , upper door tracks and setting columns.
How build Hight, telephone pole Hight and locating the North start
The list just goes on.

I am here Clovis California

Dave

Can't do that right now. With modern equipment it should be easy to build one

 

[SmithDoor]

Can't do that right now. With modern equipment it should be easy to build one

Just think equipment they use 300 years ago.
The principle of the instrument was first implemented around 1731 by John Hadley (1682–1744) and Thomas Godfrey (1704–1749), but it was also found later in the unpublished writings of Isaac Newton (1643–1727).


Green

⫷⸻❋ Now the tools used
❋⸻⫸​

.
Nice equipment for the Sextant prototype

Now for the Astrolabe tools

I thing all can build one.
Back then a machinist would good shape too

Dave

 

[SmithDoor]

Can't do that right now. With modern equipment it should be easy to build one

Most do not know the foundry did great job for the machinist not having to remove a metal.

Even gears have very little machine work just bore.

Dave

 

[Steamchick]

re: "guys use a length of clear plastic tube filled with water to insure their construction is level from point-to-point; no fancy lasers needed." - I instructed the inspectors at work to do this when setting measuring equipment truly level along a test track for testing cars.... (Typically a 30m set-up). They were amazed it worked so well, except the guy who got soaked emptying the pipe for storage! They later bought a laser level (because they could) and found it was OK in gloomy weather, great at night, but difficult over long distances in sunshine.. or when the Engineer stood in the line of the beam.
As I had them mark the positions, record the height of the kit above the road, they used that in future as the repeatable set-up was adequately level. No significant difference between either method in practice, but at night the laser was easier to use as a checking tool. And the laser was quicker than the guy getting soaked!
K2

 

[SmithDoor]

re: "guys use a length of clear plastic tube filled with water to insure their construction is level from point-to-point; no fancy lasers needed." - I instructed the inspectors at work to do this when setting measuring equipment truly level along a test track for testing cars.... (Typically a 30m set-up). They were amazed it worked so well, except the guy who got soaked emptying the pipe for storage! They later bought a laser level (because they could) and found it was OK in gloomy weather, great at night, but difficult over long distances in sunshine.. or when the Engineer stood in the line of the beam.
As I had them mark the positions, record the height of the kit above the road, they used that in future as the repeatable set-up was adequately level. No significant difference between either method in practice, but at night the laser was easier to use as a checking tool. And the laser was quicker than the guy getting soaked!
K2

Something so simple but works great every time .
It take in the earth curve too.

I have never used one
If working on 500 to 1,000 building with tube file water it just wouldn't look good. The person paying for building likes see a modern Surveying equipment. Not Home Depot/Lowes blue light sale leave.
I have never purchased but mother-in-law gave her husband laser but have one. I have use this it is ok give take ¼" [6mm] in 30 feet and no one hold a pole for you.
FYI my wife want look through the instrument not hold the pole.


I think around the home and just your self a plastic tube with water and food coloring is

Dave

 

[RM-MN]

I've tried the water in a hose level idea. It didn't work very well as it takes a little time for the water column to start moving and just as much time for it to stop moving. Raise the end one inch, wait until all oscillations stop, try again.

 

[Richard Hed]

I've tried the water in a hose level idea. It didn't work very well as it takes a little time for the water column to start moving and just as much time for it to stop moving. Raise the end one inch, wait until all oscillations stop, try again.

Put your finger over the hole when it is about half the oscillating distance.