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topic: 492Making precise bends in bullhead rail
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posted: 14 Jul 2008 20:59

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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Here's a simple idea which costs nothing and is a good way to make precise symmetrical bends in bullhead rail. It needs a bit of practice to know how hard to tap! :)

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Hopefully the diagrams are self-explanatory. Just two bits of rail about an inch long laid side by side with a gap between. The smaller the gap, so the harder you need to press/hit, but the more precisely located will be the bend. Make sure the rail is exactly square across them before making the bend -- a sheet of graph paper underneath helps.

regards,

Martin.

posted: 14 Jul 2008 21:05

from:

davelong
 
 

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Worked perfectly for me.

Thanks

Dave
Last edited on 14 Jul 2008 21:23 by davelong
posted: 15 Jul 2008 01:04

from:

donald peters
 
United Kingdom

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I feel the great hazard with this device is precisely the 'practice' element that is always inconsistent after long absence or lack of familiarity. There are more reliable results likely if the impact approach is replaced with a force approach.

OTTOMH (enigma to hand?) I can visualise a hinged lever used (in the style of the window stay employed on metal windows) to carry the bending form to the rail. The force is then applied as by the screwdriver idea. The placement of the bending form on the lever relative to the applied pressure (distance of each from the lever pivot) would magnify the force applied (ratio as desired).

By creating various pieces of hard wood, metal, etc to act as stops to the lever travel the bending would be repeatable.

I hope this is helpful although I do hear faint sounds about sucking eggs.

Regards,

Donald

posted: 15 Jul 2008 19:21

from:

Martin Wynne
 
West Of The Severn - United Kingdom

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donald peters wrote:
I feel the great hazard with this device is precisely the 'practice' element that is always inconsistent after long absence or lack of familiarity.
Hi Donald,

Thanks for your comments. The idea as shown is just something simple which anyone can do in a few minutes while track building.

There are lots of ways of taking it forward for those who like making jigs and tools. An ordinary letter embossing or riveting press might be adapted, or you could make a "falling weight on a stick" device as sometimes used for a riveting tool. Or you could set it up on a small drill press with the tool in the chuck.

Any method of improvising a v-press to make a bend in rail has the advantage over using pliers that the result is truly symmetrical. Often with pliers the part that was held in the pliers ends up straight, but the part which was bent with the fingers is slightly curved.

regards,

Martin.

posted: 1 Aug 2008 16:53

from:

Roderic Cameron
 
Teignmouth, Devon

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Just tried this last night on a P4 C8 I'm making for the DRAG test track - worked fine, thanks! :)



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