Monday, 15 December 2014

Tricky Truss Rods

Another one of the big changes on this 4th FR Super Barn, the new 119, is a new design of truss rod - and it's a bit of pain to model.

Most other carriages have two plain support posts which descend from the frame but the ones on 119 have a triangular design.

Not only that, but the truss rods themselves have anchors mounted below the frame - square boxes which the ends disappear into - instead of continuing on up to an end point hidden inside the frame.

So how was I to replicate this?

The proper way, on course, would be to mount some boxes with holes drilled into which I would poke the ends of the truss rods.

However I saw a number of issues with this.

I would have to drill holes at an angle in a small block of styrene. Tricky.

As well as bending the angles in the brass wire - which his always something of a trial and error process - I would also have to cut them to length very accurately. Again, tricky.

And unless all this was positioned perfectly I foresaw a chance that there would be a lot of strain in the structure, either on the boxes representing the anchor points where they are glued to the frame or where the wire is glued to the support posts.

So in the end I decided to cheat!

You can see in this picture that I've mounted the truss rods in the same way I have on every other Super Barn,

There is a more-or-less 90 degree bend just beyond where the anchor point is supposed to be, and some styrene strip is glued in front and along the bottom to appear like a solid box for those who aren't looking too closely.

You can call me a coward if you like.....

No comments:

Post a Comment