The Reading and Squamish Light Railway Stock Thread

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Keith S
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Re: The Reading and Squamish Light Railway Stock Thread

Post by Keith S » Fri Jul 19, 2019 8:57 am

big-ted wrote:
Fri Jul 19, 2019 5:58 am
I'm in Vancouver. You're more than welcome anytime you're in town. Gotta find some kind of silver lining to the change from Milan to Abbotsford!!
Not as bad as you might think. My training was in Malpensa, which is where the airport is; a particularly deserted and dusty little place, and Milano is not my favourite city, really. I actually found my first session in Abbotsford last month quite enjoyable. For one thing, it was a two-hour journey to get there rather than twenty. Also I spent some of my childhood in Coastal British Columbia, and later worked there, and in my opinion it's the most beautiful part of Canada. (Yes even Abbotsford).. I will miss stopping in England on the way home, but we still go there for work sometimes so hey-ho, not so bad.

Anyway, if I can convince the airport security to let me on with a live-steam locomotive, I'll bring mine next time and we can confound your club members with TWO maroon, apartment-built British locos!

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Re: The Reading and Squamish Light Railway Stock Thread

Post by big-ted » Fri Jul 19, 2019 5:53 pm

Keith S wrote:
Fri Jul 19, 2019 8:57 am


Anyway, if I can convince the airport security to let me on with a live-steam locomotive, I'll bring mine next time and we can confound your club members with TWO maroon, apartment-built British locos!
I think I mentioned elsewhere in the thread that I had my kit shipped to my Dad's place in the UK. I picked it up when I came to visit, the flew to my Mum's in Spain with it, then flew home to Canada. The boiler got scrutinised many times by airport security but, believe it or not, the only thing they actually stopped me from carrying in my hand luggage were the screwdriver tips for the Roundhouse multitool...

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Re: The Reading and Squamish Light Railway Stock Thread

Post by big-ted » Thu Nov 07, 2019 12:30 am

Made a tank wagon out of a North Pilton Works flat car, a 3D printed tank, some bike spokes & some pieces of wood.
IMG_20191024_081528~2.jpg
Need to figure out some graphics for it but pretty pleased with how it came out!

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Re: The Reading and Squamish Light Railway Stock Thread

Post by LNR » Thu Nov 07, 2019 7:15 am

big-ted wrote:
Thu Nov 07, 2019 12:30 am
pretty pleased with how it came out!
And you should be Ted, the 3D tank came out well and the bike spokes look good. Every modeller should have some, very handy things at times.
Grant.

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Re: The Reading and Squamish Light Railway Stock Thread

Post by FWLR » Thu Nov 07, 2019 8:57 am

I would be very proud of that wagon myself Ted...Brilliant. :thumbright: :thumbright:
Rod

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Re: The Reading and Squamish Light Railway Stock Thread

Post by ge_rik » Fri Nov 08, 2019 7:31 am

Great looking tank wagon. That 3D printed tank looks high quality. No sign (to me) or ridges or strata. Have you done a lot of filling and rubbing down or are 3D printers getting better?

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Re: The Reading and Squamish Light Railway Stock Thread

Post by big-ted » Fri Nov 08, 2019 12:27 pm

ge_rik wrote:
Fri Nov 08, 2019 7:31 am
Great looking tank wagon. That 3D printed tank looks high quality. No sign (to me) or ridges or strata. Have you done a lot of filling and rubbing down or are 3D printers getting better?

Rik
There was quite a bit of filling & sanding, though it wasn't so much the "layering" of plastic that I worked to get rid of. If you look closely you can still see that the curvature of the tank isn't quite smooth. Rather than being a cylinder the tank is almost slightly polygon shaped. I don't know if one of the stepper motors was sticking to cause this or if it's sone kind of resolution limit.

The printer I used is, by modern standards, very cheap & basic. The pricier modern ones can produce parts that I'm pretty sure would only need light filling & sanding. We have one at the parent office of my work that prints with carbon fibre reinforcement that turns out super strong parts also.

3D printing definitely isn't the most efficient way to make something large & cylindrical like this, but my lathe skills are pretty rusty. Besides this allowed me to print the rivets on the tank rather than applying them separately after the fact.

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Re: The Reading and Squamish Light Railway Stock Thread

Post by philipy » Fri Nov 08, 2019 2:28 pm

big-ted wrote:
Fri Nov 08, 2019 12:27 pm
If you look closely you can still see that the curvature of the tank isn't quite smooth. Rather than being a cylinder the tank is almost slightly polygon shaped. I don't know if one of the stepper motors was sticking to cause this or if it's sone kind of resolution limit.
I don't know what drawing software you use but I've had that problem with Sketchup, and recently found the answer.
Sketchup by definition doesn't draw true curves, it uses a series of straight lines joined together to approximate a curve.
I recently discovered that by default it draws a circle with 24 straight line segments. With a very small radius this isn't really noticeable but the bigger the circle the more obvious it becomes.It is possible to increase the number of segments to pretty much as many as you want, but only when a circle is first drawn on a new drawing and that new number then becomes the default FOR THAT DRAWING ONLY, it isn't possible to set it as a universal default, for some weird reason.

My Qidi printer then quite faithfully reproduces all the straight lines segments, not a curve!

This picture shows part of something I'm working on at the mo. The one on the right is the standard 24 segment circle ( part of) and on the left is increased to 64.
The angles are still visible but a lot less obvious (the O/A span of the arch is 140mm, for reference). I might try it again with say 120 or so segs, but this object takes about 6 hours 40min to print so I'm not too keen, it might be quicker to get the wet n' dry out!
I don't know, but it is quite possible that other software does something similar.
DSC_0003.JPG

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Re: The Reading and Squamish Light Railway Stock Thread

Post by big-ted » Sat Nov 09, 2019 12:17 am

You could well be right. I'm modeling in SolidWorks, which I'm very sure models genuine circles, but I have to export to .STL in order to open in my printer software (Cura) & i suspect the triangles used by the STL export do what you describe.

In any case, it's only noticeable very up close now that I've primed & sanded it, so I'm not going to lose any sleep over it.

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Re: The Reading and Squamish Light Railway Stock Thread

Post by FWLR » Mon Nov 11, 2019 7:44 am

big-ted wrote:
Sat Nov 09, 2019 12:17 am

In any case, it's only noticeable very up close now that I've primed & sanded it, so I'm not going to lose any sleep over it.

I wouldn't either Ted. :sleepy1: :sleepy2:
It's still a great build and has you say, " Who's going to see it at 6 feet away". :thumbright:
Rod

Life is so easy when I run my trains. :thumbright:

🚂🚃🚃🚃🚃🚃🚃🚃🚃🚃

https://gardenrails.org/forum/viewtopic ... 41&t=11364

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