Rail Car for Dirranbandi and Toowoomba Light Railway

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-steves-
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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by -steves- » Thu Apr 11, 2019 9:53 pm

Oily Rag wrote:
Thu Apr 11, 2019 6:03 pm
Hi Steve,
Well Ahem! Those dummy "springs" were turned from brass rod. I used a tipped tool with a triangular insert which is straight on and usually used for cutting threads. Cut in concentric rings to a common depth moving the saddle along the bed quite simply by measurement with a steel rule. I should n't say this as the health and safety are not happy with it but some careful jusicious dressing with a needle file finished the tops. Part them off to length ( I did fractionally over) and then file the back off to a full diameter, that means when assembled the pattern will come out of the mould with no undercut. A bit over length means you can adjust the fit. I did cheat and milled the back off.
The worst part of that job was getting the thing to solder up without previous bits falling off again. You can see quite clearly the flood of solder towards the back of the recesses. I should have used differing temperature solders or solder paste and warmed the whole lot through. There might have been less expletives.
it's actually nice to know you have issues doing things like that sometimes too, makes me feel a little less useless when I can't get things to go right when I do things, lol. Like solder a few things to something, then watch them all drop off when I solder something else on, these days I use engineering clamps for all soldering work as I got fed up on the Peckett build with everything dropping to bits again, lol.

I do love those brass springs! Very impressed with the molds, what are the molds made from and what resin or ? do you use to make the casts?
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Oily Rag
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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by Oily Rag » Fri Apr 12, 2019 10:00 am

post deleted
Last edited by Oily Rag on Wed Jul 17, 2019 5:28 pm, edited 1 time in total.
Regards
Ian
Dirranbandi & Toowoomba Light Railway

Jbs
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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by Jbs » Fri Apr 12, 2019 10:25 am

Ian,
Thank you for your very interesting posts about your pattern making and resin casting. I have done some preliminary searching for suitable mould making and casting materials, but it helps to have a firm recommendation of types and sources that have been found to work as is evident from your photos. If you have the time, I would appreciate a bit more information about white metal casting as I would like to have a go at both resin and white metal casting at some stage.
Regards
John
Regards,

John Smith

Harrogate

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Oily Rag
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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by Oily Rag » Fri Apr 12, 2019 10:56 am

post deleted.
Last edited by Oily Rag on Wed Jul 17, 2019 5:29 pm, edited 1 time in total.
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Ian
Dirranbandi & Toowoomba Light Railway

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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by -steves- » Fri Apr 12, 2019 1:42 pm

Ian

I would just like to thank you for your very clear and helpful posts which are always packed with useful information. :thumbup: I look forward to reading them when I see them come up in the New Posts section :thumbup:
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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by Big Jim » Fri Apr 12, 2019 3:29 pm

Outstanding,
I am off to raid my son and heir's Lego box.

I was aware of the fine tolerances of Lego after I watched a program about it. Apparently, it has to be very accurate or it won't work. The knock off or copied versions are not nearly so well made.
If at first you don't succeed, use a bigger hammer!

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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by Oily Rag » Fri Apr 12, 2019 4:51 pm

post deleted
Last edited by Oily Rag on Wed Jul 17, 2019 5:30 pm, edited 1 time in total.
Regards
Ian
Dirranbandi & Toowoomba Light Railway

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Oily Rag
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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by Oily Rag » Fri Apr 12, 2019 5:03 pm

post deleted
Last edited by Oily Rag on Wed Jul 17, 2019 5:30 pm, edited 1 time in total.
Regards
Ian
Dirranbandi & Toowoomba Light Railway

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Oily Rag
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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by Oily Rag » Sat Apr 13, 2019 9:16 am

post deleted
Last edited by Oily Rag on Wed Jul 17, 2019 5:30 pm, edited 1 time in total.
Regards
Ian
Dirranbandi & Toowoomba Light Railway

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Re: Rail Car for Dirranbandi and Toowoomba Light Railway

Post by Big Jim » Sun Apr 14, 2019 10:55 pm

This looks very interesting. Thanks for sharing it with the forum.
If at first you don't succeed, use a bigger hammer!

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