Betton Grange

The bogie (above) will sit immediately under the extension frame assembly.

I understand the large casting which will form the centre part of the pivot assembly above the bogie (Pivot Pin) still needs to be made.

 

It does appear to function as a frame stretcher, but it does appear to be a bit on the light side to support the bogie. Or have I got hold of the wrong end of the stick?

Regards

 

The bogie pivot pin is not weight bearing. The actual weight transfer will be done between the frames and the bogie using the GWR version of bolsters (ball & cup). If you look at the photo of the bogie, the weight is taken where there appears to be two rusty circles on the pads on the top of the bogie frame.

 

Yes, I'd forgotten about the de Glehn bogie ... thanks for the reminder!

Regards

 

Taken from the Swindon drawing resister of lot no 308 Running number 6800-6899 the part in question is named as

Center Pin Drawing number 25735 for 6800 and 7800

It also has an indent drawing ( which i think is used for casting/pattern pauposes ) number 25734

All headed under the bogie section

Thes racking plate fits between the extension frames bolted to two very large angle section underneath the cylinders

The bogie center pin is bolted underneath this assembly like an upside down pyramid and sits on top of the bogie

Hope this Stamped Jan 1936 info is of use

Anything else just ask

 

I wouldn't have thought that the pivot pin casting actually makes any contact with the top of the bogie centre slide block. The reason being that the bogie frame has to move sidewards under the centre slide block, with side movement springing to restrict free movement. The actual area of contact on the pivot pin is sidewards contact in the bore in the centre of the centre slide block.

 

What is the pivot pin to which you are referring ?

The center pin doesnt appear to take any weight it acts as a guide for the bogie allowing no movenment backwards or forwards but allowing sprung movement side to side
The weight of the fromt end of the loco is taken by the two sepherical ball joints either side of the bogie

 

Sorry, centre pin, my mistake. You are correct in saying that it does not take any weight.

 

I note that the gift aid contribution is to put towards the cost of an engineering survey of the boiler. Presumably it is the boiler from 7927 which will be used. This boiler was built in 1959 & not put on a loco until 1961, lasting only another 4 years until withdrawal. As this boiler is only 30 yards from the brake van which i'm restoring, i've had a good look at its general condition. Externally the boiler shell is in excellent condition ,apart from pitting along the sides of the 2 rings (a day's work for a coded welder). The stays which are visible with a torch, including the crown stays appear to be in excellent condition.
We took two rows(out of three) of superheater elements out a couple of years ago, once again appearing to be in excellent condition. At this time we removed a couple of small tubes at the bottom of the barrel & found that the front tubeplate had not suffered too badly, although this cannot be confirmed until all tubes are removed.
The Grange society expert on engineering matters '6880rules' will no doubt be able to fill us in with more details regarding this boiler.

Bob.

 

Instead of spending this money on a " boiler inspection " wouldnt it be better spent on all the non ferrous fittings associated with the boiler,
The price of non ferrous metals has risen sharply over the years (along with metal theft) i would of thought finding out what is needed and procurring it far more benefical and newsworthy.
Most importantly if the price continues to rise it would save money in the long run
The boiler will be far more cash hungary for labour than materials most of which will be steel
Just a thought
As Bob mentioned the boiler is the lowest milage and youngest of any No ! boiler in preservation
IT even came with a hopper ashpan hows that for GWR progress

 

A video tour of the frames has been uploaded to the website.

Betton Grange 6880

 

A further update with photos showing the spring hangers being fitted to the frames.

Betton Grange 6880

 

What is the bit written done

http://www.6880.co.uk/wp-content/uploads/2011/12/Rivetting-3.jpg

 

The face of the horn guide


Keith

 

Thanks Keith

 

I just found some photos of the Grange wheels at Buckfastleigh on this website www. 6880.info News . Think they are there for new tyres to be fitted.

Those Grange frames will look the part with refurbished wheels are in place.

 

They are there for new tyres and to have the crankpins set up for use on a Grange as this is different than that for a mogul.

Noticed on that website someone has conducted a boiler survey prior to the full examination. Quite a bit of info on there that even I wasn't aware of.

 

Forgive my ignorance, how so?

Foxy

 

The leading driving wheel crankpin is countersunk on the 53xx etc and 61xx etc this is due to tight clearances as the cylinders are close to the wheels so is the outside motion it is the crosshead that would ( may ) interfere with it
You will find on the Manors Hallas Granges the leading crankpin is identical to the back one

So far no one has mentioned the fact that the center balance weights need changing....!