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Author Topic: apt  (Read 27540 times)

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Offline scorpion_1925

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apt
« on: March 15, 2013, 01:23:02 PM »
I'm working on CAD for an apt-p cause I am fascinated by oddities and prototypes. I was wondering if anyone had experience of taking a CAD model and turning it into a working n gauge model

swisstony

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Re: apt
« Reply #1 on: March 15, 2013, 01:43:12 PM »
You have come to the right place, quite a few of our members do this regularly.... have a look through the site and also have a look on shapeways.com ...

Offline red_death

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Re: apt
« Reply #2 on: March 15, 2013, 02:34:25 PM »
Hi Scorpion

I've often thought of doing an APT as a 3D print. I've got some photos and measurements from the one at Crewe.

What do you need advice with? For a start you need small wheels - in the region of 4.6 - 5mm wheels (the only ones I can think of are the 5.1mm wheels available from various sources).

Cheers, Mike



Offline scorpion_1925

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Re: apt
« Reply #3 on: March 15, 2013, 02:46:53 PM »
Thank you

Mike

Whilst I have been using CAD for years, and building models for years, kits, conversions, scratchbuilds and most things in between I have never tried to link the two together
Martyn

Offline Mustermark

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Re: apt
« Reply #4 on: March 15, 2013, 03:34:55 PM »
I am no help with 3D printing advice, but I will definitely wait for it to be available... I would love to have one!

I remember going to Reading station to see one of its first outings on the Western region.  Fantastic looking train.

But, how to make it tilt in N gauge???

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I'm a personality prototype... you can tell, can't you.

Offline scorpion_1925

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Re: apt
« Reply #5 on: March 15, 2013, 03:44:13 PM »
Well I seem to remember that the hornby tilt worked quite well so wouldn't mind betting this could be scaled down to n gauge.

Offline EtchedPixels

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Re: apt
« Reply #6 on: March 15, 2013, 04:26:49 PM »
I am no help with 3D printing advice, but I will definitely wait for it to be available... I would love to have one!

I remember going to Reading station to see one of its first outings on the Western region.  Fantastic looking train.

But, how to make it tilt in N gauge???

APT-P never made the Western region - there was never any catenary at the time. APT-E did - but which one is the original discussion about ?

Going from CAD to 3D print the big things you have to think about are the physical ones - wall thickness, no mysterious holes, gaps or insides and outsides confused. A good rule of thumb is to make sure all the bits themselves are full solid objects and when you merge them together make them all overlap slightly so there is no chance for tiny gaps and unexpected surprises like duplicate faces to appear.

In CAD object A exactly touching object B is usually ok. In 3D print the printer then has no idea if A and B are one object or two that are too close together to print the gap properly - and it ends up getting rejected.

Alan
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Offline PaulCheffus

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Re: apt
« Reply #7 on: March 15, 2013, 04:30:06 PM »
APT-P never made the Western region - there was never any catenary at the time. APT-E did - but which one is the original discussion about ?

Hi

According to the OP apt-p.

Cheers

Paul
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Offline scorpion_1925

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Re: apt
« Reply #8 on: March 15, 2013, 04:35:26 PM »
I am looking at apt-p first might have a look at apt-e afterwards and the hst prototype

Thank you for the,advice Alan

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Re: apt
« Reply #9 on: March 15, 2013, 04:51:51 PM »
Provided the CAD programme you already use does 3D and can export to a file format that can ultimately be turned into an STL file format then stick with what you know (it makes life much simpler!).

As Alan says look at material specs so you stay within minimum wall thicknesses etc.

Cheers, Mike



Offline Mike W

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Re: apt
« Reply #10 on: March 15, 2013, 07:26:13 PM »
I've been hoping someone would do one of these in 3d, I'll be one of the first in the queue to order when they're ready. Best of luck with it!

Offline Pete Mc

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Re: apt
« Reply #11 on: March 15, 2013, 08:03:14 PM »
That means I'll have to settle for sloppy seconds then!

I want one already.You watch,Dapol or the Hornby n gauge subsidiary will announce an RTR example for us all to salivate over.

Pete
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Offline Mustermark

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Re: apt
« Reply #12 on: March 16, 2013, 05:17:51 PM »
I am no help with 3D printing advice, but I will definitely wait for it to be available... I would love to have one!

I remember going to Reading station to see one of its first outings on the Western region.  Fantastic looking train.

But, how to make it tilt in N gauge???

APT-P never made the Western region - there was never any catenary at the time. APT-E did - but which one is the original discussion about ?

Alan

You are quite right (as ever)... it was the APT-E I saw.

I am looking at apt-p first might have a look at apt-e afterwards and the hst prototype

Thank you for the,advice Alan

I saw the HST prototype a few times too.  Would love one of those as well!

Please do keep us up to date with progress!

http://www.marksmodelrailway.com
I'm a personality prototype... you can tell, can't you.

Offline steam-driven boy

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Re: apt
« Reply #13 on: March 17, 2013, 08:49:46 AM »
Hi,
Although I'd like an APT-P sometime I'm much relieved with my present commitments the APT-E is potentially a project for later as there would be no self-control possible otherwise - yes, mine will be that kind of railway  8)
Regards, Gerry.
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Offline captainelectra

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Re: apt
« Reply #14 on: March 17, 2013, 01:50:44 PM »
I'd love to see an APT (either E or P) in N. I have been involved with the restoration of APT-E at York a few years ago and have LOTS of interesting photos of the bogies, gangways and other obscure bits of the train. It's a fascinating bit of kit - part Gerry Anderson and part steam-age over engineering.
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