Hudswell Clarke Battery Electric Loco

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metalmuncher
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Hudswell Clarke Battery Electric Loco

Post by metalmuncher » Sun Oct 27, 2019 4:54 pm

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When I saw Mike Pinder's drawings for this loco in May 2019's 16mm today, I thought this it would make a nice quick build, a couple weekends worth of work. 5 weeks later and it's still not done...

I recently got a finer 0.25mm nozzle for my 3D printer, and wanted to see what kind of detail it could achieve. I built a prototype chassis, with an extended motor shaft driving a worm on the opposite axle, like the underside photo of loco in the article. A printed clip on assembly held the worm to the spur gear and gave the appearance of the gearbox from the underside.
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This didn't work. There was too much friction for the little 130 size motor, so I went for a traditional setup, but still with two motors.

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The motors are the type with the flats on each side, so to try and make them look round extra printed bits were added, also used to mount the motors.

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I found a photo of one of the later versions in use, and printed a driver in a similar pose.

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The driver model was generated in a program called Makehuman, loaded into Blender to pose the limbs, and then exported to an .stl for printing. This was my first time doing this - came out OK for a first go, its pretty useful to be able to generate figures in custom poses.

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The lights have red/white bicolor LEDs, with the diffuser printed in clear PETG.

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In the back box there is a power switch and removable LiPo battery, and in the front box there is a horrific mess of wires, but an NRF24 based RC system does just about fit.

The 0.25mm nozzle did reproduce a lot of detail, which basically comes for free as it is just copy and pasted in the CAD program, but the defects from it being printed are still obvious. No effort was made to sand the surfaces smooth, the prints were very quickly blasted with a hot air gun to get rid of any hairs of plastic, then painted. The NRF24 RC system seems to work OK, no issues with range have been noticed so far.

Still need to build a proper boxed transmitter for the RC, also plan on etching some brass nameplates for this and other locos.

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Peter Butler
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Re: Hudswell Clarke Battery Electric Loco

Post by Peter Butler » Sun Oct 27, 2019 6:18 pm

Brilliant!.... the frame detail is amazing, especially as you have left it untouched out of the printer.
The best things in life are free.... so why am I doing this?

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philipy
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Re: Hudswell Clarke Battery Electric Loco

Post by philipy » Sun Oct 27, 2019 7:08 pm

Overall that is a very nice job, although it's a shame that the flat surfaces show so much printer surface defect.

I like the driver. Never heard of Makehuman before but it looks interesting, how difficult is it to actually learn ( as opposed to watching aYouTube video)? You're right, that being able to create/ print custom figures would be very useful.
I did try to learn Blender ages ago but gave up, it's way to complex for my aging brain!

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Re: Hudswell Clarke Battery Electric Loco

Post by metalmuncher » Sun Oct 27, 2019 8:50 pm

philipy wrote:
Sun Oct 27, 2019 7:08 pm
Never heard of Makehuman before but it looks interesting, how difficult is it to actually learn ( as opposed to watching aYouTube video)? You're right, that being able to create/ print custom figures would be very useful.
I did try to learn Blender ages ago but gave up, it's way to complex for my aging brain!
Makehuman is very simple, just a bunch of sliders for different attributes. Short vs Tall, Fat vs Muscular, etc. Really nothing to learn, you make adjustments until you get a body shape you like, then export to another program.

Blender is one of those programs that has so many features you will never learn all of them, you just need to know enough to complete the job you are trying to do. 99% of the buttons you see on screen by default in Blender are not needed at all for posing the driver, but it took me some fiddling with import and export settings to get things like scaling correct.

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philipy
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Re: Hudswell Clarke Battery Electric Loco

Post by philipy » Sun Oct 27, 2019 9:18 pm

Yes I've been playing with Makehuman this evening and have a (printable?) basic figure sitting in Cura, so I may try it tomorrow just to see how it looks.

If it's Ok I may give blender another go when I've got nothing better to do.
Always useful to have in the techniques armoury.

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Andrew
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Re: Hudswell Clarke Battery Electric Loco

Post by Andrew » Thu Oct 31, 2019 12:29 pm

That's fantastic, a lovely loco, congratulations!

I really mus play with a 3D printer sometime...

All the best,

Andrew.

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jaypalmer
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Re: Hudswell Clarke Battery Electric Loco

Post by jaypalmer » Thu Nov 07, 2019 10:01 pm

that looks a very loverly loco..i like the driver as well..
:queen: Yes that is me in my avatar.. :queen:

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