Mini Lathe and Project

How accrucy can get on open ocean

davesmith1@... (davesmith1800) — Mon, 07 Apr 2025 20:24:50 -0700

Here one how Accurate can is a compass.

This helps

The resolution on a digital component is 0.1° .

Using solar north a simple way of finding Longitude gives a location to at the Equator of lessthan 7 NM. The closer you get to poles greater accrucy.

This using a simple sundial solar noon only and very large compassion.

At 35° latitude accrucy within 3.9 NM .

Accrucy on Ladatude using a veneer type sextant with a 6 minute veneer is 6.8 miles.

On 6 min veneer can easily read to 3 minutes or 3.4 miles.

Dave

Order tools you may need NOW

davesmith1@... (davesmith1800) — Sun, 06 Apr 2025 11:14:19 -0700

This last chance to buy low cost tools for long time

Dave

Re: 1903 Ohio shaper in operation

nitroburners@... (Nitro) — Sun, 06 Apr 2025 06:57:21 -0700

This was the first actual job on this mill was actually for this mill.

The vise was a horrible import that was rendered into a useable one with a bunch of mods.

The jaws were surface ground, the moveable jaw was modified to to tighten the tolerances, a shoe was machined for the moveable jaw and a bronze thrust button was machined for the closing screw.

I added three hold down bolt homes to the front of it, machined registers on both ends of it and milled the hold down slot on the main casting to fix it to the table with a clamp below the top surfaces of the vise.

Re: 1903 Ohio shaper in operation

nitroburners@... (Nitro) — Sun, 06 Apr 2025 06:28:38 -0700

https://www.youtube.com/watch?v=ObC6a2vIe8g Diamond 22 horizontal milling machine modifying a vise.

https://www.youtube.com/watch?v=ObC6a2vIe8g

Video on Unitmate Lathe running

davesmith1@... (davesmith1800) — Sat, 05 Apr 2025 19:34:09 -0700

Here is a nice Video on Unitmate mini lathe in use.

https://www.youtube.com/shorts/OO0_LObYHh8

I have not see this fetcher on mlnl lathe on a Unitmate mini lathe.

This is from /g/Unimat/topics

I respect the other groups want to keep to subject.

This group was formed to be a open subject group too.

Dave

Great replacement for GPS

davesmith1@... (davesmith1800) — Thu, 03 Apr 2025 18:49:30 -0700

Found great replacement for old dusty GPS .

This need no batteries and no Satellite need. It is made in brass with plating to keep brass look. Free shipping too.

You should buy two , one for a backup

https://shop.cassens-plath.de/en/sextants/sextant-models/235/gold-edition?c=27#P:1
Hight lite between brackets for PRICE
{ $11,075.00 }

Amazon & Walmart has a cheaper version too.

Dave

Time line of Navigation

davesmith1@... (davesmith1800) — Wed, 02 Apr 2025 17:24:39 -0700

Here time line

⸻⸻⸻⸻⸻⸻

�� Astrolabe first real Navigation tool ��
��

The astrolabe is an intricate astronomical instrument invented in Ancient Greece around 150 BC. It enabled measurements of celestial objects like stars and planets, told time, determined latitude and longitude, and performed astronomical calculations. The astrolabe was a revolutionary navigation aid that utilized star positions to find one's position at sea. It remained the most widely used scientific instrument until the late 17th century1. The history of the astrolabe begins in Alexandria and moves to the Byzantine Empire and the Islamic world, where it flourished from India to Muslim Spain.

⸻⸻⸻⸻⸻⸻ ��

❋❋ �� Dead Reckoning ❋❋ ��

Dead reckoning was noted in the 1500's this does work for very low tech Longitude by using charts and compass. Basically give apx miles travel in a given direction. Then with know ladatude can give a close location. There variable that could 100s of miles off

⸻⸻⸻⸻⸻⸻
�� Sextant ��

The sextant's origins trace back to ancient times, but its modern iteration, commonly referred to as Hadley's Sextant, was created by John Hadley and Thomas Godfrey in 1730. The sextant is a navigation instrument used to measure the angular distance between two visible objects. The earliest known sextant was created by John Bird in 1757

⸻⸻⸻⸻⸻⸻
�� Time need for Longitude ��

John Harrison's invention of a chronometer that could keep time at sea with sufficient accuracy to be practical for determining longitude was recognized in 1773 as first enabling determination of longitude at sea. Later methods used the telegraph and then radio to synchronize clocks

⸻⸻⸻⸻⸻⸻
�� Just in time for��
❋❋ �� Steam engines & Ships ❋❋��

Calculation of Great Circle navigation

davesmith1@... (davesmith1800) — Tue, 01 Apr 2025 11:31:01 -0700

Calculation of Great Circle navigation.

If have a global and string you do same thing.

You see photos of globals on ships some navigators will use pins on global for location and where going. Cuts down noon on calculation.

https://www.anycalculator.com/navigationcalculator.html

Dave

Group Guidelines

@... — Tue, 01 Apr 2025 05:31:09 -0700

Hello Everyone just monthly hi from

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Please take a moment to post your latest projects and photos here.

Note: It easier to post photos via EMAIL In jpeg , jpg & gif format other format may work not tested

This group can help most projects too.

You can visit your group, start reading messages and posting them here.

The email address for this group is: [email protected] Because our system allows for participants to post via web or email, you can use this email to post new topics.

To see and modify all of your groups, go to

Regards,

The [email protected]" target="_blank" rel="nofollow noopener">[email protected] Moderator

Use Sextant for time

davesmith1@... (davesmith1800) — Mon, 31 Mar 2025 21:12:54 -0700

Link to web site for sextant for time.

https://astrolabesailing.com/2016/10/04/celestial-navigation-measurement-of-time/

Dave

Re: SEXTANT input data for locations

davesmith1@... (davesmith1800) — Sun, 30 Mar 2025 21:57:27 -0700

Symbols and abbreviations for worksheet

- Hs: Sextant height/altitude

- Ha: Apparent sextant height/altitude

- Ho: Observed sextant height/altitude

- Dip: Depression of the horizon

- Sun corr.: Sun’s altitude correction table

- Date: Date of the UT observation

- UT time: Universal time

- Index error: Refers to the alignment of its optical components

- Non adjustable error: Fixed error due machining issues

- ε: Index error plus non-adjustable error

- L: Estimated latitude

- G: Estimated longitude

- height of the eye: Height of the eye above the horizon

- LL/UP: Lower limb or upper limb of the sun

- GHA: Greenwich Hour Angle of the sun (whole hour)

- pp: Increment of the sun’s hour angle

- GHA: Greenwich Hour Angle of the sun (exact hour of the observation)

- P: Polar Hour Angle

- D: Declination of the sun (whole hour)

- corr.d : Change of declination per hour

- D: Declination of the sun (exact hour of the observation)

- Hc: Calculated height/altitude

- Z: true azimuth (o° to 180°) ancient notation

- Zv: true azimuth (0° to 360°) modern notation

- intercept: Ho- Hc

SEXTANT input data for locations

davesmith1@... (davesmith1800) — Sun, 30 Mar 2025 20:13:30 -0700

Here is a pdf file on the basic inputs used for location

Search Engine List

davesmith1@... (davesmith1800) — Fri, 28 Mar 2025 23:30:17 -0700

Search Engine in excel file below

General

Name	Language	Backend ownership
Ask.com	Multilingual	Google
Baidu	Chinese	Baidu
Brave Search	Multilingual	Brave
Dogpile	English	Metasearch engine
DuckDuckGo	Multilingual	Multiple, including Microsoft Bing
Ecosia	Multilingual	Google and Microsoft Bing
Elasticsearch	Multilingual	Apache 2.0 until 2021, then Elasticsearch
Exalead	Multilingual	Cloudview
Excite��	Multilingual	Microsoft Bing
Gigablast	English	Apache License 2.0
Google	Multilingual	Google
HotBot	English	Microsoft Bing
Kagi	English	Metasearch engine and Kagi Inc
Lycos	Multilingual	Microsoft Bing
MetaCrawler	English	Metasearch engine
Microsoft Bing	Multilingual	Microsoft Bing
Mojeek	Multilingual	Mojeek
Opensearch	Multilingual	Apache License 2.0 (Elasticsearch fork)
Petal	Multilingual	Huawei
Qwant	Multilingual	Microsoft Bing
Searx	Multilingual	Metasearch engine
Sogou	Multilingual	Tencent
Startpage	English	Google
Swisscows	Multilingual	Microsoft Bing
WebCrawler	English	Microsoft Bing
YaCy	Multilingual	GPL-2.0-or-later
Yahoo! Search��	Multilingual	Microsoft Bing
Yandex	Multilingual	Yandex
Youdao��	Chinese	NetEase
You.com	English	Microsoft Bing

�� Main website is a portal

Geographically localized

Name	Language	Country
Accoona	Chinese, English	China, United States
Biglobe	Japanese	Japan
Daum	Korean	Korea
Nate	Korean	Korea
Egerin	Kurdish	Sweden^[1]^[2]^[3]
Fireball	German, English	Germany
Goo	Japanese	Japan
Leit.is	Icelandic, English	Iceland
Najdi.si	Slovenian	Slovenia
Naver	Korean	Korea
Parsijoo	Persian	Iran
Pipilika (defunct)	Bengali, English	Bangladesh
Rambler	Russian	Russia
Rediff		India
Search.ch		Switzerland
Sesam (defunct)		Norway, Sweden
Seznam	Czech	Czech Republic
Walla!		Israel
Yahoo! Japan	Japanese	Japan (Google backend)
Yongzin	Tibetan	China
ZipLocal	English	Canada, United States

Re: On the Funny Side

davesmith1@... (davesmith1800) — Fri, 28 Mar 2025 16:15:00 -0700

Just think of son's 💭 thinking each coin worth $3,500 each times 9 to 12.
O h$^% Dad might have more than 12 .

I go though allow the junk pile for $31,500 to over $42,500
Dam Dam Dam

He could stored the coins under bed like all other dad's do.

Dave

Re: Candle power engines.

davesmith1@... (davesmith1800) — Fri, 28 Mar 2025 12:27:38 -0700

Here one made by the Chinese

https://www.bing.com/videos/search?q=frame.licker+engine&view=detail&mid=E2B691BAEF5CE2255ED9E2B691BAEF5CE2255ED9&FORM=VIRE&PC=EMMX01

Dave

Re: Using g a Sextant made easy

davesmith1@... (davesmith1800) — Fri, 28 Mar 2025 05:09:47 -0700

Here is a book I found on the Sextant

https://archive.org/details/manualofsextantc00thom/page/3/mode/1up

Dave

Re: Using g a Sextant made easy

davesmith1@... (davesmith1800) — Thu, 27 Mar 2025 21:48:25 -0700

Here is a Excel spreadsheet made easy.

Re: 1903 Ohio shaper in operation

davesmith1@... (davesmith1800) — Tue, 25 Mar 2025 09:23:14 -0700

Looks great

A machinist had nice job watching the shaper

Dave

Re: 1903 Ohio shaper in operation

nitroburners@... (Nitro) — Tue, 25 Mar 2025 02:40:35 -0700

Monarch 20x96 inch engine lathe.

https://www.youtube.com/watch?v=jcAXZk6XkQs

1903 Ohio shaper in operation

nitroburners@... (Nitro) — Tue, 25 Mar 2025 02:35:50 -0700

This is on an active lineshaft in the Fred R Clark & Son Machineworks.

This old gal is the most reliable machinetool in the shop.

https://www.youtube.com/watch?v=Pow9_X7KLHU