The Plan for Indexing the Turntable 

On the real Armstrong turntables I’ve seen, there is a plate that the crew can slide across the gap to keep the rails aligned.  I see the manual indexing of my model as an opportunity to replicate this activity, as well as providing positive alignment for the turntable. When I originally thought about this, I figured the lock would be a pin and socket arrangement. … Continue reading The Plan for Indexing the Turntable 

Roundhouse rails proceeding according to plan

The cunning plan appears to be working, although like everything else on my model bench, slower than hoped! Still, I’m happy with the first stall, and the first rail on the second stall looks nicely lined up with both ends of the turntable. I’m now positioning the second set of Vs, and you can see that the cunning plan to locate these is paying off. … Continue reading Roundhouse rails proceeding according to plan

Plan for aligning remaining turntable rails

The roundhouse tracks for Pembroke meet at the edge of the turntable in a ‘V.’ This, I think, is a little unusual for model turntables, and now that I’m about to start on them, I can see why: they require some careful construction or else they’re just not going to work! The key is going to be to set one rail in place, and then … Continue reading Plan for aligning remaining turntable rails

Turntable end shims not too noticeable

As I wrote last night, the ends of the turntable need a little more adjustment in vertical alignment. Tonight I built some styrene platforms under the ends of the turntable, and laminated some .008″ phosphor bronze sheet onto them to form a sliding bearing. Then I tipped the turntable back over and reinstalled it in the pit. I make it sound easy: I actually took … Continue reading Turntable end shims not too noticeable

Further adjustments to turntable height

The mystery of the misaligned turntable is solved, and the suspect finally apprehended.  Last night I realigned the turntable lead on an actual radius of the turntable.  I found the radius by drawing a line from the centre of the turntable and then measuring half a gauge-width to set the first rail. It looks like I may not have to move the first roundhouse track, … Continue reading Further adjustments to turntable height

Suspect identified in turntable alignment mystery

Last night, I dropped tools when I realized that I didn’t understand why my turntable was not properly aligned with the first rail of the roundhouse tracks in one orientation. Thanks to both Neil and Mark who wrote in with some suggestions. Neil’s suggestion that my turntable rails were off center was true – by about .010″ or .25mm. That would certainly explain a deviation … Continue reading Suspect identified in turntable alignment mystery