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brianmcs

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Hi folks ,

 

allways wanted to be a scratch builder so I made a start on a bogie cement wagon .

will post updates as I make further progress.tank 3.jpg

tank 2.jpg

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Good for you, am sure you will get much more satisfaction from making something yourself than just opening a box - even though many boxes have very nice contents these days! Will look forward to seeing the model progress

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Hi Guys ,

thanks for all the encouraging comments , especially Scahalane whose own excellent build of these was part of the inspiration for me to have a go.

The ends were made by casting some machinable wax into a mould and machining them to size on a small lathe .

I am working from the drawing on the forum and the photos on the net. These are very good but not great for the smaller detail such as the hatch lids , so if anyone can offer more detailed pics I would be very grateful .

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Hi Folks ,

 

not sure what happened to the previous post .

Eventually made it back to the workbench and made some progress, Brian.

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Well done for your perseverance and a good outcome. Good to see some actual modelling on this Site which unfortunately has become more of a talking shop recently.

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HI Guys ,

the day job has slowed progress on this , but I got the mould made .

This is the first "pull" from it .

It is in a polyurethane resin .

The white one is the master .

I need to work on eliminating the air bubbles in the resin .

 

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For the first test that looks great. It's nice to see that all the hours and effort have really paid off.

 

Rich,

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thanks guys ,

 

the mould has one part in silicone rubber and a core made in acetal both of which are inside an acetal box or " shell" .

not sure if that makes it a 2 or 3 part mould?

 

Now that I am starting work on the chassis does anyone have any advice re which bogies to use ?

 

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Hi brianmcs

 

The mould looks cool, though it looks like you had an air problem also! the silicone looks like it needs to be evacuated when mixed and before pouring to make the mould- this may help in casting bubble free casts. Also you could try a mould spray loubricator it may stop the plastic cast forming bubbles at the bubbles in the mould! if that makes sence?

 

SSM do the bogies sides your looking for or you could the Y25 bogies from Bachmann which are a bit smaller then Irish ones

 

Eoin

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Hi brianmcs

 

The mould looks cool, though it looks like you had an air problem also! the silicone looks like it needs to be evacuated when mixed and before pouring to make the mould- this may help in casting bubble free casts. Also you could try a mould spray loubricator it may stop the plastic cast forming bubbles at the bubbles in the mould! if that makes sence?

 

SSM do the bogies sides your looking for or you could the Y25 bogies from Bachmann which are a bit smaller then Irish ones

 

Eoin

 

Hello Eoin ,

 

I am a big fan of your work .

There are air bubbles in the surface which you can see but virtually none on the surfaces of the part. This can be achieved by brushing a coat of the silicone onto the part first .

If I was doing this professionally I might invest in some vacuum equipment which would produce a better result .

I am using a spray on wax on the silicone and a honey wax on the acetal core ( in the day job I work with GRP )

The lubricant will not usually eliminate the air bubbles in the polyurethane resin but there are a couple of ways of doing this .

I will try them and post an update .

 

Thanks for the tip regarding the bogies .

 

Brian.

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Hi Brian

 

Thanks

 

I'm now a fan of your work, when I saw the way you put the mould together I said 'he's done this before' - GRP - I did a bit of that years ago working on boats n stuff- a long time ago!!

 

Even the master model for the mould is very neat

 

Eoin

Edited by murrayec

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