Riveting

Going with the top rows for the 40' deck girder.

Going with the top rows for the 40′ deck girder.

This being a holiday, I took the opportunity to start in on BR 387. The bridge is a pair of open deck girders; one 85′ the other 40′. Umpteen years ago back when the GN goat yahoo group was the only source of info I had I posed a question regarding the bridge’s dimensions. Glen Haug very kindly provided me with most of what I needed to start the project. And so I did. You can see the result in the header. That was back in the days of my 4’X8′ layout. Sections of Atlas plate girder bridges were cropped and elongated to produce a model that fit the envelop.

Fast forward to today and I’m on version #3, version #2 being stillborn owing to poor technique. Using a modified Taig/NWSL riveter,  row upon row of rivets are easily embossed on what ever pitch and schedule I desire. Basically, If I can turn the punch and die I can emboss the rivet. No more trouble aligning rows or using registration rivets to work out offsets, the X-Y table, eliminates the need to ever reposition the workpiece. This new found utility does come at a price though for one needs to know what size rivet to emboss in the first place. Luckily there are some bridges available locally to inspect.  On my walks I’ve most often seen 1.25″ and 1.375″ rivets on bridges designed with similar load limits. If the rivets are to scale out after paint then best to make them a touch undersize. With that in mind I went with a .006″~ rivet shown at the top of the image.

First step will be to produce the top and bottom vertical chords and then fettle everything else into position.

Back to riveting,

AH

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