Quartering locomotive wheels

Mr Grumpy

Western Thunderer
I was having a think about the quartering of my coming MOK 9f kit.
I'm sure this task will be some way off!
I'm no steam buff, and certainly not an expert, but knew of such things from my live steam days.
Anyway I knew that one side should 'lead' and thought I would do a little research and came across this useful article by Martin Baker:

Wheel quartering
 

richard carr

Western Thunderer
Richard

If you are using slaters wheels then quartering is all done for you by the axles.
If you are doing a Gresley 3 cylinder loco then you have problems getting the 120 degree thirding.


Richard
 

Eastsidepilot

Western Thunderer
I was having a think about the quartering of my coming MOK 9f kit.
I'm sure this task will be some way off!
I'm no steam buff, and certainly not an expert, but knew of such things from my live steam days.
Anyway I knew that one side should 'lead' and thought I would do a little research and came across this useful article by Martin Baker:

Wheel quartering

Richard,

Slater's wheels not a problem but if you are using cast wheels on telescopic axles then you will need a jig, I have a home produced jig if you need help.

Col.
 

Mr Grumpy

Western Thunderer
Richard,

Slater's wheels not a problem but if you are using cast wheels on telescopic axles then you will need a jig, I have a home produced jig if you need help.

Col.
Thanks for your generous offer Col,
I purchased a complete set of Slaters wheels at the Reading show before Xmas, so shouldn't be a problem.
 

Scale7JB

Western Thunderer
Brilliant article all the same.. Never knew that the Gresley 3 cyl engines were unequal on the quartering (thirding).. Is that where the 'Gresley Beat' comes from?

JB.
 

mickoo

Western Thunderer
Brilliant article all the same.. Never knew that the Gresley 3 cyl engines were unequal on the quartering (thirding).. Is that where the 'Gresley Beat' comes from?

JB.
Precisely, it's an asynchronous three beats per revolution. The crank angles are calculated by the angle of the middle cylinder, those higher up and with a greater angle from horizontal had larger off sets. Typically Gresley engines had the outside cylinders horizontal and the middle cylinder raised by x degrees (somewhere between 6 and 7°), Thompson and Peppercorn had all the cylinders at the same angle, typically 1° off horizontal and (I think...that pile of reference material is buried at the moment) used uniform 120° spacing's, however, they are split over two axles, the middle cylinder driving the leading axle, the outer driving the intermediate axle, Gresley engines all drove the same axle.

One thing I did get from the article is the 'lead' crank pin, that's the first time I've ever seen any information like that written down and have been struggling to work out on my projects which crank is supposed to be leading, and, it now looks like I have to swap the axles out for these new slaters 120° ones :thumbs:
 
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Mr Grumpy

Western Thunderer
So, I see the 9F leads with the right hand side.
Therefore if the crank pin is horizontal on the RHS, would the LHS crankpin be facing up or down? :confused:
 

Mr Grumpy

Western Thunderer
One thing I did get from the article is the 'lead' crank pin, that's the first time I've ever seen any information like that written down and have been struggling to work out on my projects which crank is supposed to be leading, and, it now looks like I have to swap the axles out for these new slaters 120° ones :thumbs:

Sorry!
 

JohnFla

Western Thunderer
As a novice I always look at it as RHS 3 o clock LHS at 12 o clock I seem to remember it better that way :)
 
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