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High Tensile Studs ?

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RICHARD GREEN 210/04/2012 17:29:12
329 forum posts
193 photos

I am building a 6" scale Burrell traction engine, I have to fit the cylinder block to the boiler with 10mm studs and nuts,

I have in stock a load of new 10mm studs, just the right length, but they are high tensile ,

Are these suitable for this job , or shall I make some from EN8 ?

Richard.

Springbok10/04/2012 19:20:30
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879 forum posts
34 photos

Is the cylinder block cast iron and the boiler steel. !! I could be shot down in flames for saying this but a would wipe your studs with a smear of molidium grease before inserting.If the boiler is steel you should have no problems.

Bob

RICHARD GREEN 210/04/2012 20:16:19
329 forum posts
193 photos

Yes the boiler is 10mm thick steel, and the cylinder block is about 16mm cast iron,

Someone suggested to me that the heating and cooling of the boiler as it's used would affect the quality of the high tensile material, to a point where the HT studs could fail,

Whereas EN8 might be a bit more forgiving, ?

Was he talking rubbish, or is there any truth in what he says ?

Richard.

Andrew Johnston10/04/2012 22:47:57
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7061 forum posts
719 photos

Don't think you need anything fancy. In the linked thread EN3B is recommended:

http://www.tractiontalkforum.com/showthread.php?t=20177&highlight=studs

Regards,

Andrew

JasonB11/04/2012 07:34:52
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25215 forum posts
3105 photos
1 articles

No nothing too exotic needed.

You may want to consider making bolts with a dummy bit of thread protruding or silversoldering nuts onto a threaded stud. This makes it a lot easier if the block has to come off as trying to remove all the studs with just a small amount of protruding thread won't be easy.

Something like these ones of Conrad's

http://homepage.ntlworld.com/corromant/diary.htm

Bit of Foliac on the studs when you put it together will help them come out, graphite not manganise.

J

RICHARD GREEN 212/04/2012 08:51:22
329 forum posts
193 photos

Thank you all for your ideas, I was only thinking of using the high tensile studs because I already have them in stock,

It will probably be better to make 25 studs from EN3B, that should be more than adequate.

Thanks,

Richard.

RICHARD GREEN 212/04/2012 13:05:15
329 forum posts
193 photos

Michael, The drawings show the studs threaded straight into the 10mm thick boiler barrel,

The joint will be 1.5mm thick steam gasket , with foliac manganese spread on both sides,

Then all clamped up together with 25 10mm studs and nuts.

This is a 6" scale engine, so the boiler barrel should be about 1/4" thick, but for some reason they make these model boilers 10mm thick, that should be more than enough to thread these studs into.

Richard.

JasonB12/04/2012 13:12:24
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25215 forum posts
3105 photos
1 articles

Thickness is because wasting (rusting) does not scale so you can't just half the full size thickness.

J

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