Yet Another PDF Baldwin

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Old Man Aaron
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Yet Another PDF Baldwin

Post by Old Man Aaron » Tue Jun 23, 2020 12:41 pm

I'd been "umm-ing & ahh-ing" over the PDF Models Baldwin kit for some years now. But a new loco is an exceedingly rare and expensive treat. Seeing Mitch Stack's Baldwin started my thinking about one again, and for once, I had the money to spare. In spite of this, I stayed disciplined after the kit arrived, leaving it in the cupboard - there's plenty of work left to do on the new workshops and existing projects. After a month however, I relented and unpacked the kit.

14/06/2020
The kit arrived complete and undamaged, which was very fortunate - the box hadn't been taped shut prior to dispatch! Quite understandable, what with the current workload that Peter and Leanne are facing. No harm done. I was particularly impressed with the wheels (Slaters?) - judging from photos until now, I thought they were Binnies. (Nothing wrong with Binnies of course, most of my stock rides upon them)
IMG_7346.JPG

The instructions state that the frames' axle holes are to be drilled out to 3.8mm. Well, I don't have oddly-sized drills, so I thought I'd just try a 4mm bit, and see how the bearings fit. Worst case, turning new bearings to fit oversized holes wouldn't take long.

As it turns out though, 4mm rendered an excellent press-fit to these bearings. A bit of retaining fluid was applied with a screwdriver, simply because I had some.
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The mini vice was quite handy for this.
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As this is the newer version of the kit, with rather nice laser-cut frames and rods, the frames' screw holes are no longer countersunk, and phillips-pan-head screws are provided. Preferring hidden screws, I countersunk the holes with the 4mm bit, and have ordered new screws to suit.
IMG_7351.JPG

Few kits I've assembled screw together, so it was a nice change to be able to easily run a dummy assembly to see how the completed loco will look. Unsure weather to paint it green or yellow, but either way, it'll look just right as an early I/C loco in the canefields. Given that a number of Hunslets, Baldwin tanks and Simplexes of the Great War were later sold to Queensland sugar mills, the prospect of a Baldwin tractor in the canefields is plausible.
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17/06/20
A coat of filler primer helped in smoothing the slightly rough laser-cutouts. The burrs left from countersinking were also filed away. The primer was cleaned from the bearings with cotton buds dipped in thinners.
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Some very minor bowing was straightened, in readiness for assembly.
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18/06/20
The gearboxes' irregular shape inevitably makes it a particularly tedious part to finish, but well worth the effort. Comparing with photos of the prototype and Wrightscale models, the PDF gearbox seems to be a representation, rather than replica. This doesn't bother me, but it's a good, prominent spot for some extra detailing. Dummy bolt heads were added roughly where I could see them on the prototype..
IMG_7368.JPG

I hadn't used these "MENG" bolt heads in years. Very nicely moulded, but a sh*t to apply. In hindsight, using tweezers and a fine-tipped glue applicator wasn't the right way to use these.
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This time, I thought I'd try solvent weld - and what a difference that made. A small drop was applied to the gearbox.
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Whilst the brush was still wet, it could be touched against a bolt head to pick it up, then placed into the puddle of solvent and dissolved filler-primer on the gearbox. The head then sticks into the puddle, and the brush can be withdrawn.
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Letting it dry for a minute, followed by a light re-application of solvent to where head and gearbox meet, helps them stay stuck together.
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19/06/20
The countersunk M2 screws arrived surprisingly quickly, allowing the chassis to go together. Emery boards were quite good for finishing the visible surfaces of the frame stretchers.
IMG_7370.JPG

Whilst the front axle was a nice, free-spinning fit in it's bearings, the rear was quite stiff. Checking the assembly revealed nothing untoward, so I opted to simply bed the axle into place. A little light oil applied with a flat blade screwdriver, and twenty minutes with a cordless drill, had the axle running as smoothly as it's counterpart. I'll have to remember to de-grease around the axle with cotton buds and alcohol, before painting..
IMG_7372.JPG

That's all so far.
Anzac Creek Workshops blog - HO, 16mm & 2ft endeavors.

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Jimmyb
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Re: Yet Another PDF Baldwin

Post by Jimmyb » Tue Jun 23, 2020 2:04 pm

Aaron, nice job so far :)

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Re: Yet Another PDF Baldwin

Post by ge_rik » Tue Jun 23, 2020 7:58 pm

Plenty of useful detail here, thanks. I'm enjoying the build so far

Rik
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Tom85
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Re: Yet Another PDF Baldwin

Post by Tom85 » Tue Jun 23, 2020 10:38 pm

Yep - this is looking really good, looking forward to seeing the finished article. It looks a lot more complicated than the Fowler Peldon kit I made recently though

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Mitch stack
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Re: Yet Another PDF Baldwin

Post by Mitch stack » Wed Jun 24, 2020 2:25 am

Looks Good mate! let me know how you go with quartering the cranks and getting the chassis running because ive had problems getting mine behaving .
Mtch

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Re: Yet Another PDF Baldwin

Post by Garethh » Wed Jun 24, 2020 8:19 am

I’m toying with the idea of one of these, any chance you could measure the wheels and axles for me? I’m wondering if I could use ip’s adjustable wheelset to make it gauge adjustable...

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Old Man Aaron
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Re: Yet Another PDF Baldwin

Post by Old Man Aaron » Thu Jun 25, 2020 3:41 am

Cheers, fellas. It's a very enjoyable kit. Very much looking forward to the day Peter releases the WDLR Hunslet 4-6-0T - apparently 32mm only, but that won't stop me from converting it.. ;)

I know there's plenty of ways to quarter a wheelset, but I don't plan on quartering enough locos to warrant building or buying a jig. I think I'll go for the simple method of using shims and a 3" engineers' square. Will get to that soon enough..

Checked the wheels an axles with digital verniers - axles are ⅛", wheels are 30mm dia. The wheels are a tight fit on the axles. But if one only rarely wanted to switch gauges, one might get away by just holding the axle with vice grips, and twisting the wheels along the axles to change their gauge. That said, the spoked centers are only plastic, so they might not hold up to repeated twisting. Just my thoughts anyway..

I realised that soon, I'm going to need all of the electrical components on hand, to work out where they'll fit, so I've ordered an Mtroniks soundcard from Chuffed2Bits. It sounds uncannily similar to the prototype, though I'm no fan of the card's horn, so that won't be used.

This morning, before proceeding with fitting the gearbox, I figured I'd best remove the motor, and make absolutely certain the front axle spins freely. It runs so nicely in fact, that it's shown me the rear axle still needs quite a bit more running in with the drill before proceeding..
IMG_7438.JPG
Anzac Creek Workshops blog - HO, 16mm & 2ft endeavors.

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Re: Yet Another PDF Baldwin

Post by Garethh » Thu Jun 25, 2020 9:25 am

Thanks for the info, builds looking great so far!

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Old Man Aaron
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Re: Yet Another PDF Baldwin

Post by Old Man Aaron » Tue Jun 30, 2020 7:07 am

26/06/20
After another spin with the drill, I realised the gearbox cover's nut slots needed filling, before I impede access to them with the gearbox itself. Might as well fill the rest of the slots whilst I'm at it. I've been hearing a lot of good things about Squadron putty, so figured I'd give it a go. Very nice to use, though I never realised just how quickly it hardens. I suspect using it when our 40° Summers roll around, will be interesting..
IMG_7439.JPG

After sanding and filing the cranks, the splits in the front cranks were started with a razor saw, then opened out a little, with a triangular file. A razor blade is very good for removing the burrs left behind.
IMG_7440.JPG

Replicating the prototype's second crank clamping bolt is a good opportunity for extra detailing. I should've started the hole closer to the center-line of the crank, but didn't want to obstruct the grub-screw hole with the dummy clamping bolt's head. The hole was drilled about ¼ through the crank, to 1½mm dia. A spare M2 screw was then screwed into the hole.
IMG_7441.JPG

The crank was then flipped over, and the M2 screw could then be used as a guide, to align the hole on the other side of the crank. Why not just drill through in one go? Too much hassle to set up in my cheap, sloppy machine vice, which would likely have ended up holding the crank on an angle, making for a crooked hole. I'll get to cutting and fitting the dummy clamping bolts later.
IMG_7442.JPG

To make the the "stepped-out-bit" of the counterweight, a radius was carved into scraps of ½ millimeter styrene, which were then fitted with solvent.
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The excess material was then removed, and the slot cut as before.
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The rod spacers were then thrown in the drill and sanded.
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After sanding and filing the putty, the gearbox was finally fitted in place. I thought about using retaining fluid, but as this axle just flops around, I opted for superglue.
IMG_7449.JPG
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Re: Yet Another PDF Baldwin

Post by GTB » Tue Jun 30, 2020 9:46 am

Old Man Aaron wrote:
Tue Jun 30, 2020 7:07 am
I've been hearing a lot of good things about Squadron putty, so figured I'd give it a go. Very nice to use, though I never realised just how quickly it hardens. I suspect using it when our 40° Summers roll around, will be interesting..
The kit looks better engineered than some 3D kits I've seen. The designer is selecting materials based on fitness for purpose, rather than just blindly trying to print everything.

Where did you manage to find Squadron putty in Oz? It disappeared locally a while ago and my last tube has started drying out.

I've never noticed much difference in it's drying time in hot weather (we do get that here now and again 8)). If the filler layer is thin it can usually be sanded within an hour or so, even in the brass monkey weather we are having at present.

Regards,
Graeme

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