Humps out of the way, fellow Westerners, attention returned to the Gaugemaster uncouplers deployed at the end of each platform road. I’m resorting to these as once the proposed overall roof is fitted, there will be little opportunity to use a paddle to uncouple stock.
I’d originally got as far as drilling the two holes required (11mm apart) and preparing the sleepers. Even at this early stage, I discovered that I would have to divert from the brief instructions, as to make the uncouplers sit below the rails, more sleepers had to be removed than shown. Not a problem really, as aesthetics are secondary to the primary goal of building a working layout. Both would be nice, but beggars sometimes can’t be choosers. Thankfully, the white metal uncoupler plates cover a multitude of sins!
Although not explained in the instructions, it appeared that an iron collar, attached to the shaft via a grub screw, which was a slide fit into the circular shaped solenoid, raised the uncoupler plate when the solenoid was energised; gravity returning it to its starting position when de-energised. A push to make switch was advised, however, I wanted the bank of switches to match, so used some spare centre off switches - wired to one side only - for the job (perhaps aesthetics do matter more than I thought!).
Not the most confident of modellers as I’m sure you’ll have gathered by now, I decided to build a model to practise on, using the same materials as per the baseboard (12mm ply topped with half inch cork).
The instructions stated a 3.5mm drill was required for both holes, however, I had 3 and 4mm bits - isn’t it always the way? - so I started with 3 (too tight) and then 4 (looser, but maybe too loose?), so deciding on doing the job properly, slipped on my clogs and popped to the shops. But the 3.5 was still too tight and required precision drilling which was never gonna happen here, so decided to plump for the 4mm. However, not wishing to throw caution to the wind, I decided to look online to see if others had written about fitting these uncouplers. One helpful individual had indeed and made one or two recommendations, including use of a 4mm drill bit as he’d experienced the same problem. He also recommended countersinking the hole where the shaft exited beneath the baseboard to ensure that the plate to which the solenoid is fitted and wired sits flat. I did same, however, I’m not so sure of its usefulness as the lip of the plate on one had curled up, such that tightening the screw via the hole in the plate provided, saw it sitting at an angle.
He also recommended extending the moulded lug that sits in the adjacent hole and which is countersunk. It’s role is stop the plate yawing left or right in operation and touching the wheels of the stock above it (possible source of a short). He added 5mm, although using code 75 rather than my choice of Streamline, but I did the same for reassurance. I’d intended to use some brass tube for the purpose, but there was a spare piece of plastic tubing sticking out of container at the end of the bench, which was quite a good fit, so the use of my tube cutter and a spot of uhu saw the job done (no superglue in case I needed to make adjustments).
It worked fine on the model, so I went ahead and drilled the layout for real.
Thankfully, those in platform roads one and two worked first time without any issues, although the guesstimated positioning of collar on shaft will require adjustment as the collar doesn’t quite lift high enough. Platform road 3 was a different kettle of fish and involved a lot of faffing about to get it to work, including redrilling the shaft hole and repositioning of some adjacent wires to get it to move freely. Ironically, the height of the collar was right first time as can be seen below, however, I’m going to see if I can adjust it further to ensure it lifts such that the plate is horizontal throughout.
Finally, they don’t sit quite as centrally as intended between the rails. To reduce the risk of shorting, I think I’ll coat the edges of each plate with a film of PVA. I hope and trust I wrote all that clearly enough to satisfy your curiosity, however please accept my sincerest apologies if I managed to lose you along the way. Perhaps the pix attached will clear up any ambiguities.
It’s the furthest three switches from the left in the bank of switches in the above photo that operate the solenoids (by pulling towards you - only a few seconds, mind otherwise there’s a risk of burnout!).
Best
Jonte
Edit to add that I used a second screw against each solenoid plate to align it correctly with the shaft, which also supplemented the only screw provided for:
By adjusting the tension of each screw, I found I could ensure that the solenoid was held against the baseboard in the correct alignment, so that the shaft wasn’t held too tightly inside thus preventing free movement. Jonte