Festiniog Railway Welsh Pony - 3 D printed

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by Trevor Thompson » Thu Jan 21, 2021 11:52 am

The modification:
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I might modify the spool holder to make it fit better with the door on.

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by Trevor Thompson » Thu Jan 21, 2021 11:57 am

And now on to the bodywork. I am making the footplate handrails on the resin printer. Just to see it they work. These are to scale and therefor look rather delicate. However the other things I have made out of resin seem very resilient. In fact I think connecting rods made out of resin will be too flexible rather than too brittle.
So if these fail i can beef them up:
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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by ge_rik » Thu Jan 21, 2021 12:01 pm

Very impressed by the new boiler parts. I've not tried printing things vertically like this. My cheapo printer certainly couldn't handle it as there's too much X and Y slop which gives any parts a corrugated look. I think my other printer might cope better, though - but it's got a large printbed (300 x 300), so I wonder if that might cause it to have a bit more give than your printer with its smaller bed. I'll have to give my larger printer a try on something tall.

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by -steves- » Thu Jan 21, 2021 4:28 pm

ge_rik wrote: ↑Thu Jan 21, 2021 12:01 pm Very impressed by the new boiler parts. I've not tried printing things vertically like this. My cheapo printer certainly couldn't handle it as there's too much X and Y slop which gives any parts a corrugated look. I think my other printer might cope better, though - but it's got a large printbed (300 x 300), so I wonder if that might cause it to have a bit more give than your printer with its smaller bed. I'll have to give my larger printer a try on something tall.

Rik
I print roof's vertically on my Ender 5 and, the last one was 225mm high, but it printed great :thumbup:
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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by Trevor Thompson » Thu Jan 21, 2021 7:35 pm

I think that the issue is printing in ABS. It is a very unforgiving material to print with. I have had problems doing roofs as well. Probably I should use one of my spare nozzles and get PLA for printing roofs and the like.

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by FWLR » Fri Jan 22, 2021 11:34 am

That is a superb 3d print of your boiler Trevor, very impressed with it.

Don't think I could attempt to be cutting any holes in mine though mate. Anne would be so upset and I don't like doing that for fear of reprisals... :lol :lol

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by -steves- » Fri Jan 22, 2021 4:19 pm

Trevor Thompson wrote: ↑Thu Jan 21, 2021 7:35 pm I think that the issue is printing in ABS. It is a very unforgiving material to print with. I have had problems doing roofs as well. Probably I should use one of my spare nozzles and get PLA for printing roofs and the like.

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Wouldn't be a bad shout, PLA is much more forgiving for roof's, not sure I could print an ABS roof :oops:
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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by Trevor Thompson » Fri Jan 29, 2021 12:39 pm

I have most of the model ready to assemble - but I am not satisfied with the gears I have used to provide the drive.

They are rather noisy, perhaps this is the problem with cheap plastic gears.

Anyway the chassis as it stands:
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It does run, but it makes an un-prototypical racket!

I have taken to fine tuning my wheels in the lathe. Mounting them on a mandril allows me to turn the tread to exactly the same diameter on each wheel, and clean up the flanges as well. It seems to overcome the occasional problems I was having getting printed wheels to run true. Note that the number of skin layers and infil density I am using is making these almost solid. They seem to turn as if they were solid material!
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It is about time I cleaned and oiled the lathe!

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by Trevor Thompson » Fri Jan 29, 2021 12:44 pm

I have also started to assemble the tender:
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You can also see the connecting rods, coupling rods and slide bars ready to attach to the chassis in the background.

I am making a copy of all the components (after I successfully assemble each section) with a view to offering the locomotive as a kit of parts in the for sale section of this forum when I have it completed.

I am currently awaiting a tool to enable me to make my own worms and worm wheels from brass - which I think will solve the noisy gear issue!

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by -steves- » Fri Jan 29, 2021 1:25 pm

Looking very good so far Trevor, can't wait to see it complete. :thumbup:
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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by ge_rik » Fri Jan 29, 2021 1:41 pm

Coming along nicely, Trevor.
I must try printing a roof, Steve, I've fought shy of it up until now. :pale:

Just had to replace the nozzle on my cheapo printer - my first major clog. Decided it was to gummed up to manage to clean it up properly. I suppose, after nearly a year, that's not bad.

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by -steves- » Fri Jan 29, 2021 1:54 pm

ge_rik wrote: ↑Fri Jan 29, 2021 1:41 pm Coming along nicely, Trevor.
I must try printing a roof, Steve, I've fought shy of it up until now. :pale:

Just had to replace the nozzle on my cheapo printer - my first major clog. Decided it was to gummed up to manage to clean it up properly. I suppose, after nearly a year, that's not bad.

Rik
Honestly, an upright roof comes out well. If in any doubt you can add a 1mm or 2mm wide support each side that just touches the roof, careful though, if the touching point is too small, it will just build separate structures, ask me how I know, lol. :oops:

As for nozzles, I replace mine most times it clogs. If upping the heat doesn't clear it, then it gets replaced there and then.

Trevor will know this one, I assume ABS doesn't clog in the same way as I printed ABS at 205 degrees by accident and although it didn't stick to the base board, it did leave an almighty mess of ABS all over the place overnight, lol. :oops:
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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by philipy » Fri Jan 29, 2021 2:17 pm

That is looking very good Trevor.

I assume the tender body is printed as 3 separate sides with the insides flat on the bed? The external surface finish looks excellent from what I can see.
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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by Trevor Thompson » Fri Jan 29, 2021 5:04 pm

ge_rik wrote: ↑Fri Jan 29, 2021 1:41 pm
Just had to replace the nozzle on my cheapo printer - my first major clog. Decided it was to gummed up to manage to clean it up properly. I suppose, after nearly a year, that's not bad.

Rik
I haven't had to replace a nozzle since I started using ABS exclusively.

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by Trevor Thompson » Fri Jan 29, 2021 5:07 pm

philipy wrote: ↑Fri Jan 29, 2021 2:17 pm That is looking very good Trevor.

I assume the tender body is printed as 3 separate sides with the insides flat on the bed? The external surface finish looks excellent from what I can see.
Yes the tender was printed as 3 sides, a curved top, a base upside down on the bed, and two axle box sets. Tha axle boxes are joined by a stretcher so there is one print per side. I did think about making the springs work - but maybe next time!

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by Trevor Thompson » Fri Jan 29, 2021 5:10 pm

The other comment I would make is that the quality of the surface of the prints is very good - probably the best I have ever had. The only difference is the supply of filament. I have been getting it direct from a company called PolyProps via their website.

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by philipy » Fri Jan 29, 2021 5:21 pm

Cheers.
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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by Trevor Thompson » Fri Feb 05, 2021 6:12 pm

I have made my own brass worm wheel and stainless worm which I hope will be much more suitable for this model. " Free hobing " the worm wheel using an M8 spiral flute tap:
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Of course to fit its I had to disassemble the existing wheels which had been secured to the axles with foaming polyurethane glue. Initially I couldn't move them on the shaft and thought I was going to have to make new wheels. After applying heat from a soldering iron onto the ends of the axles they came free quite easily. So the wheels are re-usable. I have put it back together with the new worm wheel and re quartered the wheels:
IMG_1314.jpg
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I will try it in the morning when the glue has cured.

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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by philipy » Fri Feb 05, 2021 7:21 pm

Trevor Thompson wrote: ↑Fri Feb 05, 2021 6:12 pm " Free hobing " the worm wheel using an M8 spiral flute tap:
Beyond me I'm afraid but it certainly looks most impressive and I'm full of envy. :)
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Re: Festiniog Railway Welsh Pony - 3 D printed

Post by ge_rik » Fri Feb 05, 2021 7:29 pm

Wow!!! This must be a first for the forum. Home made gears.....

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