Hexworthy will be at Narrow Gauge South at Eastleigh on Saturday, so I have been carrying out the usual preparations (a quick vacuum) and testing (running all the train combinations I can think of). There were a few minor jobs to do too, including looking at the exhibition fiddle yard following some occasional issues at it's last outing at Chatham last year.
The probable cause of the occasional derailment or unwanted uncoupling was mismatched rails between the lead track and the traverser. A couple of rails needed lateral adjustment, but several had a slight change in height. The rails are soldered to PCB strip either side of the join, so adjustment meant applying a soldering iron until the solder melts and holding the rail in the right place (including up slightly where needed) with pliers while it cools. All seems good now, hopefully it will stay that way!
The deck had become stiff to turn, and had started squeaking when turned. The pivot is simply a bolt which had a washer, nut, and locking nut underneath - the lock nut preventing the nut coming undone. When I looked underneath I found the nut had wound itself tighter upward into the wood support, forcing the washer with it - while the locking nut stayed where it was. Here, I've removed the lock nut and the normal nut is about to be removed, but the washer remains embedded about 2-3mm into the timber.
The solution was a bigger washer, and using just the lock nut which shouldn't loosen or tighten. The tightness has been adjusted so the deck spins freely but there's no vertical movement. The old washer remains embedded in the wood - I guess it can act as a bearing!
The end gates for the deck folded down to rest on the rails. The problem is when the deck is slid back and turned, they could catch on the fixed tracks, and the resulting jolt derails most of the stock on the deck unless it is turned very slowly and carefully! The solution is simply a screw (seen centre) acting as a lower stop, holding the gate high enough to clear obstructions when turning.
I also made an adjustment to the latching arm release mechanism underneath. This pushes the sprung notched aluminium arms (seen lower left in the photo) away from the alignment pegs so the deck can traverse smoothly. I took a photo, but it doesn't really help explain things unless you know what your looking at - so suffice to say the lever doesn't need to be pressed so far to allow smooth deck movement.
My operating team say that the birds on the canopy are not sufficient to accurately position the train for uncoupling. Something to do with the operating position being four feet away to the end of the layout. In an attempt to make uncoupling easier, I've added tufts of grass. The idea is that with the overscale blue tit in line with the coach roof and the grass by the end of the footboard, together being easier to judge from an acute angle, the coupling should be over the magnet.
The other tuft of grass of course aligns with the robin, the marker for the Microtrains uncoupler magnet. In both cases the trick is to stop beyond the magnet, then set back to the markers to uncouple. We shall see how much the grass tufts help...
Now I just need to pack up for the show. It looks well worth attending if you can - do say hello.
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