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Posted by Tim Leech on June 21, 2008, 5:59 am
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On Fri, 20 Jun 2008 16:20:28 -0700 (PDT), Cheshire Steve
>Hope the links here work as mere description is not enough - I would
>like to reproduce at small scale four of these column transition
>pieces, each with both corner and centre 'petals' as well as metal
>angular fillets between, and the Victorians really have me beaten.
>Maybe the only way is to carve a pattern and then cast them, in which
>case any guidance on lost wax/investment casting would be welcome - I
>can't see how they can be machined from solid.
>
>http://uk.geocities.com/iron_museum/image/Detail4.jpg
>http://uk.geocities.com/iron_museum/image/Detail5.jpg
>
>This is the only ornate part of the entire engine, so can hardly be
>ignored.
>
>Steve
Carve one by hand in whatever material you fancy, stick it onto a
blank of the main column profile.
Make a mould from dental mouding material (latex?).
Cast them individually in resin or whatever from the mould.
Glue into place.
Tim
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Posted by Cheshire Steve on June 21, 2008, 7:00 am
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> On Fri, 20 Jun 2008 16:20:28 -0700 (PDT), Cheshire Steve
>
>
>
> >Hope the links here work as mere description is not enough - I would
> >like to reproduce at small scale four of these column transition
> >pieces, each with both corner and centre 'petals' as well as metal
> >angular fillets between, and the Victorians really have me beaten.
> >Maybe the only way is to carve a pattern and then cast them, in which
> >case any guidance on lost wax/investment casting would be welcome - I
> >can't see how they can be machined from solid.
>
> >http://uk.geocities.com/iron_museum/image/Detail4.jpg
> >http://uk.geocities.com/iron_museum/image/Detail5.jpg
>
> >This is the only ornate part of the entire engine, so can hardly be
> >ignored.
>
> >Steve
Thanks for your input guys. As much of it needs a brass finish, then I
want to make those part in brass. Sadly I don't have a 4 axis CNC
machine - which is a good thing as I doubt I could operate one - but I
can see it would be handy to have a dividing head for my newly
acquired milling machine, so this might be the job that forces me to
knock one up using a spindle and lathe gears (its been on my to do
list). I think I will have to make these in three parts - the 8 petals
and square top in brass, the middle section will be painted, so I can
utilise some of your suggestions for low temperature casting or
plastic moulding for that.
Thanks for the potentially useful link to the Prop Shop - their
website is away being varnished at the moment, so I look forward to
finding what they offer. I have a small muffle furnace that is good
for 1000C, and I wondered if it might be possible to cast some in
brass using a lost wax process (investment casting) - then just finish
turn them. I suspect that the originals must have been made by casting
and then finish turning - and I have always fancied doing a bit of
casting, but I don't know how feasible it is. Anyone had any
experience of this - (probably should look on a jewellery newsgroup).
Steve
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Posted by jasonballamy on June 21, 2008, 8:19 am
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If you cast them in resin with a metal filler powder they will look just
like brass and can be polished up as bright as you like.
Just turn a spigot on the top of the column to pass through the
decorative capital and take the decorative nut.
All the casting materials can be bought from here
http://www.tiranti.co.uk/category_list.asp
Jason
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Posted by SDL on June 21, 2008, 11:44 am
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Cheshire Steve Wrote:
>
> >
> >Thanks for the potentially useful link to the Prop Shop - their
> website is away being varnished at the moment, so I look forward to
> finding what they offer.
>
> Propshop will lost wax cast your patterns in most metals, brass ,
> bronze, stainless etc. Patterns can me almost anything. the propelers
> are carved in milliput.
>
> Prop shop have integrated with swan foundry
>
> http://www.swangroup.co.uk/companies.php?id=1
>
> who will also do cast Iron on a large scale.
>
> Steve Larner
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SDL
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Posted by PG1D/PA-11Ø12 on June 21, 2008, 1:07 pm
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>> On Fri, 20 Jun 2008 16:20:28 -0700 (PDT), Cheshire Steve
>>
>>
>>
>> >Hope the links here work as mere description is not enough - I would
>> >like to reproduce at small scale four of these column transition
>> >pieces, each with both corner and centre 'petals' as well as metal
>> >angular fillets between, and the Victorians really have me beaten.
>> >Maybe the only way is to carve a pattern and then cast them, in which
>> >case any guidance on lost wax/investment casting would be welcome - I
>> >can't see how they can be machined from solid.
>>
>> >http://uk.geocities.com/iron_museum/image/Detail4.jpg
>> >http://uk.geocities.com/iron_museum/image/Detail5.jpg
>>
>> >This is the only ornate part of the entire engine, so can hardly be
>> >ignored.
>>
>> >Steve
>
> Thanks for your input guys. As much of it needs a brass finish, then I
> want to make those part in brass. Sadly I don't have a 4 axis CNC
> machine - which is a good thing as I doubt I could operate one - but I
> can see it would be handy to have a dividing head for my newly
> acquired milling machine, so this might be the job that forces me to
> knock one up using a spindle and lathe gears (its been on my to do
> list). I think I will have to make these in three parts - the 8 petals
> and square top in brass, the middle section will be painted, so I can
> utilise some of your suggestions for low temperature casting or
> plastic moulding for that.
>
> Thanks for the potentially useful link to the Prop Shop - their
> website is away being varnished at the moment, so I look forward to
> finding what they offer. I have a small muffle furnace that is good
> for 1000C, and I wondered if it might be possible to cast some in
> brass using a lost wax process (investment casting) - then just finish
> turn them. I suspect that the originals must have been made by casting
> and then finish turning - and I have always fancied doing a bit of
> casting, but I don't know how feasible it is. Anyone had any
> experience of this - (probably should look on a jewellery newsgroup).
>
> Steve
Hi Steve,
I did do some alu casting and that could well be the way to go. But then
again you should make a model ...! Making patterns is very timeconsuming and
rather difficult. Too much effort for only a few pieces. Depending of the
scale I reckon handcarved selfcuring clay could be an option.
Dirk
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>like to reproduce at small scale four of these column transition
>pieces, each with both corner and centre 'petals' as well as metal
>angular fillets between, and the Victorians really have me beaten.
>Maybe the only way is to carve a pattern and then cast them, in which
>case any guidance on lost wax/investment casting would be welcome - I
>can't see how they can be machined from solid.
>
>http://uk.geocities.com/iron_museum/image/Detail4.jpg
>http://uk.geocities.com/iron_museum/image/Detail5.jpg
>
>This is the only ornate part of the entire engine, so can hardly be
>ignored.
>
>Steve