Lyn >> Schull & Skibbereen Erin(ish)

[Soar Valley Light]

That is looking fantastic, Rik.

I couldn't agree more, it's an absolute beauty. That has to be 'Pride of the line' Rik.

SVLR Andrew

[thornmini]

WOW! A real beauty Rik. I've told you 3D printing guys you do amazing stuff.

[Andrew]

That's really lovely Rik - I particularly like the elegant arch of the cab doorway...

Re your "gappy" area under the smokebox, I wonder whether some tweaking below the running plate would help - I'm thinking maybe some beefier cylinder covers to go over the originals?

[-steves-]

About half way through printing out the parts ..... all OK except my heated bed has suddenly decided to develop a cold spot in the centre - so now having to position everything near the edges

Rik

Just put some Pritt Stick in the middle where the cold spot is, might take 2 layers to work well, but it WILL stick

[-steves-]

Looks absolutely amazing Rik, great job.

How much of the drive and bogies is 3D printed and if it's a bought block, what motor drive is it?

[ge_rik]

Looks absolutely amazing Rik, great job.

How much of the drive and bogies is 3D printed and if it's a bought block, what motor drive is it?

Hi Steve
The block is from my Bachmann Lyn as is the bogie - I did a cut and shut job on the Lyn's two wheel bogies to make the four wheeler. The sides are 3D printed though.

The clamshell for the Lyn motor block is very poor quality plastic. Most of the destination mounts for the self tapping screws have split, so it's held together very tentatively - ie the screws are just about biting but can't be tightened completely. Once I've got the body sorted, I might draw and print out the two halves of the clamshell - I'm sure I'm not the only one suffering from clamshell disintegration!

Rik

[Jimmyb]

The clamshell for the Lyn motor block is very poor quality plastic. Most of the destination mounts for the self tapping screws have split, so it's held together very tentatively - ie the screws are just about biting but can't be tightened completely. Once I've got the body sorted, I might draw and print out the two halves of the clamshell - I'm sure I'm not the only one suffering from clamshell disintegration!

Rik

Rik, I bought an early Lyn (second-hand) and yes the clamshell was in very poor condition. After some repairs to ensure it held together, I "move" mine on, but in a lot better condition than I bought it.

[ge_rik]

Rik, I bought an early Lyn (second-hand) and yes the clamshell was in very poor condition. After some repairs to ensure it held together, I "move" mine on, but in a lot better condition than I bought it.

Quick search online suggests

Clamshell.jpg (33.08 KiB) Viewed 9727 times

Rik

[GTB]

The clamshell for the Lyn motor block is very poor quality plastic. Most of the destination mounts for the self tapping screws have split, so it's held together very tentatively - ie the screws are just about biting but can't be tightened completely.

More poor design than poor plastic, although recycled plastic won't help. I've repaired a few electronic device cases over the years with the same problem of the screw pillars cracking, but I've also got a couple designed so that they'll never crack.

I use pieces of brass tube as a collar pressed on over the split post as a repair. The tube needs to be a tight enough push fit to close the crack in the plastic and it won't work if any chunks of plastic have broken away from the post.

The repair will last, but only if you are careful about tightening up the screws, as the self tappers used can easily strip out the thread in plastic if over tightened.


The loco body has come up nicely, but I agree, it needs a dummy frame behind the cylinders and from there to the front headstock. There's far too much daylight under the front at present.

Regards,
Graeme

[BertieB]

This is a wonderful advertisement for CAD and 3D print model making – and your enthusiasm and aptitude for it. Very nice indeed.

[ge_rik]

More poor design than poor plastic, although recycled plastic won't help. I've repaired a few electronic device cases over the years with the same problem of the screw pillars cracking, but I've also got a couple designed so that they'll never crack.

I use pieces of brass tube as a collar pressed on over the split post as a repair. The tube needs to be a tight enough push fit to close the crack in the plastic and it won't work if any chunks of plastic have broken away from the post.

The repair will last, but only if you are careful about tightening up the screws, as the self tappers used can easily strip out the thread in plastic if over tightened.

Past that stage, unfortunately. Most of the pieces of the various pillars have parted company and either disappeared or are rattling around inside the clamshell.

The loco body has come up nicely, but I agree, it needs a dummy frame behind the cylinders and from there to the front headstock. There's far too much daylight under the front at present.

The dummy frame is now done and, as on the Lyn, serves a triple purpose of filling the space, retaining the cylinder moulding and securing the body to the motor block..

I'll post a few photos later.

Rik

[ge_rik]

On the home straight ........








(Images hosted on my blog - https://riksrailway.blogspot.com/2021/0 ... rt-88.html )

There's still a bit more to be done - a bit more pipework, nameplates, numberplates, makers' plates and some gauges, pipes and brake standard in the cab. She seems to run quite well but I've not had a chance to do a full test run as yet.

3 x 18650 li-ion cells, Deltang Rx65c receiver/controller and MyLocoSound Universal steam soundcard.

Rik

[Peter Butler]

That's looking really good Rik. You have managed to get a smooth paint surface too, very well done.

[philipy]

Yes, I agree with Peter, a very nice job.

[ge_rik]

Thanks chaps
I've now blogged the build here in case anyone wants to see wot I dun
https://riksrailway.blogspot.com/2021/0 ... -into.html

Rik

[Andrew]

That's a lovely-looking loco Rik - it will look equally at home at the head of a posh passenger rake or roughing it with a goods...

[Sylvian Tennant]

Lovely work Rik. This CAD/3D print malarkey is certainly becoming very tempting.

[-steves-]

Agree with what everyone else has said, great design, great build and excellent finish, very well done

[ge_rik]

Update on progress

It's taken me a while - three or four re-designs plus a few duff prints - but at last I now have a purpose-made clamshell housing for the motor block to accommodate the larger motor which was installed by a previous owner.




I moved the axles out by a couple of mm to ensure the worm wheels were more central on the worms and also to make sure they couldn't rub against the motor casing as previously happened. It means I'll have to extend the connecting rods - but that's a small price to pay....

Rik

[Peter Butler]

Now that's what 3D printing is for!