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GSR Class 551 / J26 ECMbuild in 7mm

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murrayec

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Break gear coming together

Shoes cut out of Delrin for insulation purposes and the hangers from .5mm brass

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Hangers marked out and holes drilled ready for cutting out

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All the bits, including guard irons from .5mm brass, the fire grate front n sides and a little bit of grate detail in .5mm brass with rivets punched

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Break shoes pinned onto the hangers, 1.2mm brass tube with .6mm id soldered into the chassis to take .6mm pins to hang the breaks off

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Breaks test erected and joy-rigged at the lower end to work out the longitudinal break lever arms and cross fittings..... next

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Eoin

Edited by murrayec
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  • 2 years later...

Just noticed when looking over this thread, after a long time, I describe the material for the break shoes as 'Delrin' it's not! it's Tufnol, a great material for the modeller. Made from wood/paper, it has great structural qualities, easy to be worked and can be machined.

Eoin

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58 minutes ago, murrayec said:

Just noticed when looking over this thread, after a long time, I describe the material for the break shoes as 'Delrin' it's not! it's Tufnol, a great material for the modeller. Made from wood/paper, it has great structural qualities, easy to be worked and can be machined.

Eoin

When I had a 'real' job, these materials were in widespread use We also had Paxolin and Permali, plus quite a few other more 'modern' composite materials.

Permali was particularly nice - resin impregnated beechwood plies. It is fantastically tough - and takes a beautiful finish.

Tufnol always struck me as a sort of artificial boxwood substitute, in the way that its properties were not directional at all, and it was so 'fine-grained' that almost any size/shape combination would be OK.

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You may have come across Dave Gorman the comedian?

I worked with his father, who I remember being a huge fan of Tufnol, to the point where it almost became a running gag in itself, long before his boy took up joke-telling for a living.

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Yes. Little known fact that the Dubliners’ hit ‘the hot asphalt’ was originally titled ‘the hot Tufnol’....

’And if it doesn’t last for ever sure I swear I’ll eat me hat’....

kudos for a connection to Dave Gorman, though. And I have been looking up Tufnol to make brake blocks - laminating brass ones right now which I hate! 

 

Edited by Galteemore
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4 hours ago, murrayec said:

I can just see you now- sitting around the billy can slurping the tae and swapping Tufnol jokes🤣 those were the days.......

Eoin

He once had a twenty minute violent agreement with a chap, until I could stand no more and shouted at them until they finally understood that they were both saying exactly the same thing, but from opposite directions.

There is an amusing materials-based story involving asbestos, but I'll have to tell you that verbally one day, as it's not suitable for a public scenario...

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