The climate change debate continues.

[Bruce Tuncks]

I was once told by an old tyre guy that the car handbook generally tells you to use pressures about 5psi less than the best pressure as far as tyre life and mpg are concerned . For example, if the book says 30 psi then you should use 35 psi. The ride will be a bit harder.

I reckon Tesla have already gone the 5psi to increase the range , and so the handbook pressures should not be increased.

[facthunter]

Run your tyres low and they will heat up more and deteriorate faster.  Let them down on sand though.  (You  still might get bogged.) Nev

[spacesailor]

There is a way to get to that ' optimal ' preasure. 

Inflate to recommended preasure,  then drive far enough to heat tyre , check preasure! ,if higher you need  more to start with . No increase means you were right the first time . ( abridged  version  ) .

spacesailor

[willedoo]

On 02/04/2023 at 6:15 PM, onetrack said:

Willie - Yes, drilling in a grid pattern is the way it's done. They utilise diamond drilling, as the nickel is found in the sulfide ground, which is not usually found until you get down to around 50M to 150M into the ground. The material found between the surface and the sulfide ground is called the oxidised ground, it has been severely weathered. However, sometimes the sulfide ground is found on the surface.

The sulfide ground is usually extremely hard, so only diamond drills will penetrate it.

My total experience at diamond drilling was five weeks spent offsiding on a rig. It was an old trailer mounted Mindrill that the owner bought second hand ex New Guinea for $4,000. With a five weeks drilling contract, I'd say he got his money back quickly. From memory, I think we were drilling at a 60 degree angle, as it was the best bet for finding the historic gold bearing quartz vein that averaged 4' in depth but only 6" to 8" wide.

 

It was a simple light rig - 4 wheel articulated trailer mounted, Lombardini main engine and mud pump engine. It had a little monkey board that unpinned and swung free and horizontal when the derrick was at an angle. It didn't get much use as the drilling was done with a removable inner tube rather than a core barrel. The only time the rods had to be pulled was when it needed a bit change. It's amazing how long those diamonds last. My job was to get the second inner tube ready and oiled, and deal with the full tube when it came out of the ground. The two halves would split open revealing the core sample which I packed in the geologist's sample boxes, then wash down the tube and coat it with soluble oil. Occasionally the geologist would show up and he would run a compass + camera down the hole to make sure we were going in the right direction.

 

It was an easy job; I even had time to read the paper between core samples due to the slow rate of drilling. I got a big shock after that when I did a couple of weeks on a conventional core barrel rig drilling for coal samples near Singleton. When the bit hit coal, it went through it like butter with rods being added and core barrels being swapped over in a rapid fashion. Count your fingers and work flat out. Luckily we got rained out and I went back to more civilised work.

[pmccarthy]

I have worked a Gemco trailer-mounted auger rig, and production Airtrak both up and down holes underground, on the rods and on the controls. Couldn't do it now.

[Old Koreelah]

7 hours ago, willedoo said:

My total experience at diamond drilling was five weeks spent offsiding on a rig…

Willy my drilling rig career didn’t even last as long as yours!

A couple of weeks offsiding on a rig doing core samples on a man-made island…in the middle North Sydney. Excavations for the foundations of the Northpoint Tower hit a snag when the central “island” started moving sideways. Out task was to bring up samples of the weak, sloping strata that it was moving on. 

A very long way below us about a hundred new immigrants were digging out the underground carpark. They were being showered by our cold, dirty drill waste and some pretty angry abuse was shouted up at us.
 

Under orders, I constructed a temporary coffer dam to contain the horrible liquid, but that just postponed the inevitable; the poor buggers were inundated by a massive dam burst, prompting us to leave work early that day, as a crowd of irate labourers ran up the access ramp.

[willedoo]

I remember once coming across a driller in the Moonie Basin who was drilling upholes. I asked him how it was going and he replied "Boring". It must be the standard driller's joke.

[old man emu]

It might not be the right drill, but getting back to topic, I was watching a documentary last night about the invention of trousers. 

 

Archaeologists found a graveyard in an extremely area of Eurasia. The aridity had preserved the clothing and other grave goods that normally rot away, so the documentary was mainly about the research into the clothing found. However, as part of the documentary they discussed the investigation of things like pollen and such found in the gravefill and surrounding area. That investigation found that at the time the people were living there, about 4000 years ago, the area was a fertile, well-watered area with grasses and trees. The people farmed and kept sheep and other animals, and hunted waterfowl. 

 

From getting core samples and studying the strata in the samples the investigators were able to track the decline of the climate in the area from this Eden-like place to today's moistureless, lifeless wasteland. This indicates that climate change is not all carbon pollution driven, but a part of the normal behaviour of the planet.

 

PS: For the students of sources of Biblical stories, the following came to me when I used "Eden-like". The location of Eden has been taken to be to the East of the land of the Isrealites. The location where the mentioned graveyard was found is to the east of the land of the Isrealites. Could this place, once lush and fruitful, now uninhabitable, be the source of the idea of an Eden? Ever since Heinrich Schliemann discovered Troy based on Homer's supposed myth, and other instances, archaeologists have been taking a closer look at ancient myths and legends to find that grain of truth on which the story is based. That grain is not the hero's story, but what makes up the background or setting.

[Bruce Tuncks]

I  read that the biblical "eden" is in anatolia, a part of Turkey these days. I would have thought it too dry, but when you look carefully at rainfall figures, there is more water than I thought.

[onetrack]

The scientists have only recently discovered evidence of "megadroughts" in studies of ancient tree rings.

The megadrought evidence has been discovered in every continent.

 

These megadroughts seem to have occurred at around cycle periods ranging from decades to centuries, and are suspected as being the reason why a number of previous civilisations seemed to have just died out, with no immediately discernable reason.

 

https://theconversation.com/megadroughts-helped-topple-ancient-empires-weve-found-their-traces-in-australias-past-and-expect-more-to-come-191770

[Old Koreelah]

Cyclical mega draughts certainly hammered many civilizations, but human activity has always played a part; overgrazing by goats and sheep is surely a major factor. Once the trees are gone, you’re stuffed!

[facthunter]

Salinity and no organic carbon in the soil No microorganisms and high soil temps etc etc.  Nev

[octave]

Back on the subject of tyre pressures and Teslas.  My son recently replaced his original tyres with a more economical tyre. He has owned his Tesla since 2019.  His tyre wear has been a little accelerated due to his involvement with motor sports.  Although he has an ICE motorsport car he lobbied hard for his club to allow EVs to compete.  Anyway the point is that I am reliably informed by him that the correct pressure for an EV tyre is not 80PSI.

 

[Bruce Tuncks]

Octave, I reckon its terrible that your son had to lobby hard to get ev's to race. Tell him goodonyer.

[spacesailor]

My grandson also fought the establishment to get '' drifting " off the nsw roads & into Eastern creek motorsport park . At the moment he is " drifting " in Japan .

spacesailor

[Bruce Tuncks]

Tell him goodonyer too spacey. The best way to get hoony kids off the roads we all use is to provide them with tracks to do it properly. It's one of the reasons why sport is good for kids, and motorsport is especially good.

[facthunter]

They wonder why the sun and planetary gears in the diff play up later..  Nev

[spacesailor]

My grandsom has his dedicated driffter-car's diff welded !.

As , who needs a diff when 'wheel-spinning ' it would make it that much harder. 

Same as differant wheel size on dirt speedway 1 races . ( no diffs here to ).

Only need a dif for road work to unlock either wheel , not needed on dirt .

spacesailor

[facthunter]

You mentioned getting them OFF the roads so that's what I presumed you were talking about..   nev

[Bruce Tuncks]

I reckon it was me who hopes that motorsport will keep kids from racing each other on the roads we all use.

 

[facthunter]

Many of us think like that but you don't drive a locked diff on the road. Amilcar was an exception to that though but it didn't have the Power we think of today Nev

[spacesailor]

A lot ( so it's said ) of 4X4 driver's Are driving with their '' Dif Locks '' engaged .

Then they wonder why their tires are stuffed .

I did drive a truck with the ' exhaust brake ' on. I didn't know about it until I returned the truck to the ' hire ' depot . 

spacesailor

Edited April 25, 2023 by spacesailor
more added

[Bruce Tuncks]

I've got a Chinese  farm buggy ( $6000) which has 2wd,4wd,4wd diff locked and also has an electric winch. It was clearly designed for the back-blocks of Tibet, since it has exhortations to "renew the fluids after immersion" etc.

[red750]

[Marty_d]

* sigh *