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Other Topics / Re: 3D Printed Driver
« Last Post by 753 on Today at 10:06 »
John
The Jubilee wheel has a large raised boss in the centre I chose to make this part in brass with the quartering square milled in the back to receive the axle

Nick
The wheel was printed with HIPS, I don’t know if other material would be as robust!

Mike
I posted an thread on a carriage made from styrene Oct 2019, you posted a positive reply.

I think the important point missing in discussion of all these methods is that some of us are having to make our own models of loco’s and stock we like is that they are not commercially available.
Given the amount of use that models are subjected to i.e. very little, the need for them to be built like the proverbial brick out house is questionable.
Colin Chapman of Lotus fame constructed his Formula 1 cars to be as light as possible and was quoted to say “If it falls apart AFTER it crosses the line, I will be content”.
I am not suggesting we follow this philosophy, but a reasonable compromise between the two extremes.


Mike
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Other Topics / Re: 3D Printed Driver
« Last Post by IanT on Today at 09:54 »
The wheel was a sample printed by a G1MRA member for Mike. The files are available on the G13Dcircle Group IO site

By "centre" if you mean the print material - I believe he uses HIPS for his wheels, so assume this sample will be the same. He's also mentioned Carbon-fibre loaded PLA in an earlier post but that was in relation to something else.

Regards,

IanT   
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Other Topics / Re: 3D Printed Driver
« Last Post by Nick on Today at 08:51 »
Do you know which material was used for the centre?

Nick
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Other Topics / Re: 3D Printed Driver
« Last Post by John Candy on Yesterday at 23:00 »
Apart from the steel rim (already mentioned), how would the steel axle be fitted?
Loctite or superglue, with a keyway to prevent rotation?

John.
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Other Topics / Re: 3D Printed Driver
« Last Post by MikeWilliams on Yesterday at 21:45 »
I am suspicious of all new materials, having seen many proclaimed as the new wonder material, and then fail.  Plastikard was to be wonderful for carriages, but I've seen many warp and twist, or shrink and go brittle.  But the wheel does seem very impressive.

Mike
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Other Topics / Re: 3D Printed Driver
« Last Post by 753 on Yesterday at 17:43 »
Trevor

This was a test exercise, the CAD file I already had as it was for the Jubilee build found in the Loco Projects section. I do not intend machining a tyre for the printed wheel.

Loco driver wheels I have made in the past have aluminium centres and steel tyres as here.

Mike



image upload

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Other Topics / Re: 3D Printed Driver
« Last Post by Spitfire2865 on Yesterday at 14:22 »
How do you plan to put tyres on them?
Id be most interested in seeing how this progresses since Im stalled on my own wheels. Having the center printed would make it much easier.
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Other Topics / Re: 3D Printed Driver
« Last Post by John Branch on Yesterday at 14:06 »
I do love an empirical test!

John
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Other Topics / 3D Printed Driver
« Last Post by 753 on Yesterday at 10:10 »
Although a member of G3S I am also a member of the G1MRA who have an offshoot 3D Group. An exchange on making spoked driver wheels with CNC I posed the question has anyone made a 3D printed wheel with oval spokes as I had a CAD file of the Jubilee wheels. One member offered to have a go as an experiment.
I received the wheel last week and was impressed with the print, but wondered how strong was it with those slender spokes, I rigged up a test with heavy bits of steel and a chuck total weight 5.8kg, the wheel did not distort and that’s without a tyre.
I will pursue this technology in future projects.

Mike




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Locomotive Projects / Re: GWR Saddle Tank
« Last Post by Doddy on Oct 17 2020 22:20 »
Incidentally, No. 652 was withdrawn in March 1929, which narrows dowm the photo to the period 1923 to 1929.

John.
As stated in the previous post   24 September 1926. Picture courtesy David Burton.
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