The Tread Thread

[Outdated]

 

[Aspychata]

I need help understanding this one, my dear.

Sometimes this entire post can also be referred to as a thread. My brain constantly rhymes everything which is a giant pain for me. These posts are actually a Tread thread.

https://learn.microsoft.com/en-us/p...customer-engagement-apps/manage-forum-threads

 

[SusanLR]

Then there's the everyday Treadmill.

 

[Human Avatar]

A not commonly known thing about tyres is that they are designed to take about 3 retreads! Unfortunately because most people don't know about it, including the fitters, tyres get chucked before they've been through a 3rd of their potential life span.

I'm quite tempted to buy the chisels to do a retread and try it myself!

It would certainly help a good set of Continentals last a bit longer.

I tend to get budget tyres but one place did give me a set (pretty sure they were Continental) for cost as the customer had given the wrong details so they were stuck with a relatively rare set of tyres that were perfect for my car. I had to pay the fitting fee but it was still a super cheap deal. I have to say, my car stuck to the road like glue!

I still have two of them but they are worn pretty badly.

Interesting Fact - In America on The Tractor Trailers, We Retread all the tires on the trailers and truck , except the steering tires . When they wear out and fall off and end up along side the road we call them alligators

 

[Nitro]

Chain driven truck

 

[MildredHubble]

Interesting Fact - In America on The Tractor Trailers, We Retread all the tires on the trailers and truck , except the steering tires . When they wear out and fall off and end up along side the road we call them alligators

Ah yes! I've seen a few "alligators" on the roads here in the UK! Lol! It's funny because you'd think they would hate the climate here, but nevertheless, you usually see them at the end of a big track of rubber, presumably from when someone braked really hard to avoid the alligator! I guess that's how it happens!?

 

[Forest Cat]

Chain driven truck
View attachment 90672

That guy is doing parking wrong. I have done it too a couple of times.

 

[Human Avatar]

Ah yes! I've seen a few "alligators" on the roads here in the UK! Lol! It's funny because you'd think they would hate the climate here, but nevertheless, you usually see them at the end of a big track of rubber, presumably from when someone braked really hard to avoid the alligator! I guess that's how it happens!?

Yes I would not think of UK as swampy !

 

[Human Avatar]

That guy is doing parking wrong. I have done it too a couple of times.

Side down Parallel Park

 

[MildredHubble]

Chain driven truck
View attachment 90672

Ooo! Interesting! It looks like perhaps it was a quick way of extending the wheel base without having to modify the chassis much and to keep the differential in the same spot and use the same prop shaft? Pretty cool! I've never considered that as a solution. Pretty clever I suppose but the chains I guess are a week spot.

 

[Outdated]

perhaps it was a quick way of extending the wheel base

I was looking at that myself, there's a couple of other advantages too, the diff is raised to just under the body and less likely to be damaged when travelling over rough ground, and it doesn't bounce up and down with the suspension, no need for universal joints on the drive shaft.

 

[Nitro]

Ooo! Interesting! It looks like perhaps it was a quick way of extending the wheel base without having to modify the chassis much and to keep the differential in the same spot and use the same prop shaft? Pretty cool! I've never considered that as a solution. Pretty clever I suppose but the chains I guess are a week spot.

Not exactly a solution to anything, it was just how it was done in the early days.
The drives were noisy, required frequent lubrication, were unsuitable for extreme loading, poor at handling higher speeds and suffered from grit and grime kicked up by the tires and poor road conditions.

Hypoid gearing on an enclosed housing with full floating axles was eventually the norm.
A full floating axle serves the purpose of only providing the rotating forces instead of also bearing the load as was the norm in light duty trucks and rear wheel drive passenger cars.

 

[Human Avatar]

I was looking at that myself, there's a couple of other advantages too, the diff is raised to just under the body and less likely to be damaged when travelling over rough ground, and it doesn't bounce up and down with the suspension, no need for universal joints on the drive shaft.

I was thinking that is a design flaw if the truck was used in weather with snow and ice as a factor with the chains .

 

[Nitro]

1921 Mack C cab chain drive

 

[MildredHubble]

I was thinking that is a design flaw if the truck was used in weather with snow and ice as a factor with the chains .

I was wondering about this too. I remember how many times the chain used to fall off on my bike as a kid. Imagine having to pull that trick of lining up the chain and rotating the wheel until the chain fully meshes with the sprocket! You'd have to have time pretty strong arms to get that done, maybe even twice on one axle!

 

[Aspychata]

1921 Mack C cab chain drive
View attachment 90700

That reminds me of my brother's toy Tonka truck.

 

[MildredHubble]

1921 Mack C cab chain drive
View attachment 90700

Everything had style in those days! Not like the homogeneity in vehicle design these days. It's such a shame they don't have that flare anymore. Traffic would be so much more interesting!

 

[Nitro]

A hypoid geared third member was designed to place the drive pinion gear above or below the centerline of the drive axles to alter the location of the input shaft.
Cars and light trucks got the advantage of lowering the propeller shaft to keep the floor pans lower to the road to place the chassis lower to the roadway..
Over the road trucks generally have the same configuration with the exception of the pinion angle being 90 degrees to the roadway that places the propellor shafts above the axles.
This was also useful when driving them in twin screw applications which in effect simplified their couplings.

Hypoid gearing in turn produces a gear meshing that is a constant sliding motion as opposed to a miter cut system which are both sloppy and noisy. (aka prove to failure)

 

[Nitro]

Everything had style in those days! Not like the homogeneity in vehicle design these days. It's such a shame they don't have that flare anymore. Traffic would be so much more interesting!

and cold and wet,and hot...
Na, I love old stuff, but I'll take modern every day.

 

[MildredHubble]

I was looking at that myself, there's a couple of other advantages too, the diff is raised to just under the body and less likely to be damaged when travelling over rough ground, and it doesn't bounce up and down with the suspension, no need for universal joints on the drive shaft.

I was thinking about universal or constant velocity joints too. I think it wasn't until the 1950s when they started to appear on some cars. Until then, they used a sort of rubber donut coupling to allow some play in the rotating shafts. They were even in use until the mid 1970s, I think it was the lotus Elan that used them on the drive shafts which lead to some flaky handling after, well, not many miles at all.