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Author Topic: Steam Engine Base Pattern  (Read 31486 times)

Offline doubleboost

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Steam Engine Base Pattern
« on: July 01, 2012, 04:29:15 PM »
Hi
Lads
I have been wanting to make a horizontal steam engine for some time now
As i have a cylinder pattern from my marine engine i decided to make the engine around this
It will be a fairly big affair with no bolts smaller than M6
A simple L shaped pattern is needed for the base
In the past i have used MDF as pattern material
The dust from sanding and machining this horrible material has made me feel poorly on more than one occasion
Rob Wilson donated some Birch ply wood and i had some bits of old Oak shelving (Popper wood)


The basic shape glued together



Car body filler is used to blend curves


All internal corners need a nice smooth fillet ,in the past i used car body filler (easy to apply but hard work to sand off)
I bought some fillet wax (bees wax) this is blended in to the corners with a ball bearing on a stick.
Much easier and faster than body filler.


As you add more detail it starts to look something

The Grey bit will be hollow the rest is solid





A coat of high build primer transforms the pattern
John

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Offline jb3cx

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Re: Steam Engine Base Pattern
« Reply #1 on: July 02, 2012, 01:59:25 AM »
looking good john,what size flywheel you going to use ?
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Offline Brass_Machine

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Re: Steam Engine Base Pattern
« Reply #2 on: July 02, 2012, 02:16:59 AM »
That is not going to be a small engine! Can't wait to see this one get built.

Is this going to be just a model or do you plan to power something with it?

Eric
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Offline krv3000

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Re: Steam Engine Base Pattern
« Reply #3 on: July 02, 2012, 02:36:01 AM »
well dun john
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Offline NickG

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Re: Steam Engine Base Pattern
« Reply #4 on: July 02, 2012, 01:11:45 PM »
 :bugeye: It's  huge!! Nice work John.
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Offline Stilldrillin

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Re: Steam Engine Base Pattern
« Reply #5 on: July 02, 2012, 03:38:01 PM »
The usual, beautiful pattern work John!  :clap: :clap:

Clocked in. Watching quietly.......  :thumbup:

David D
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Offline loply

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Re: Steam Engine Base Pattern
« Reply #6 on: July 02, 2012, 05:21:33 PM »
That is one big mould for a home shop  :bow:

What are you going to cast it with?
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Offline doubleboost

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Re: Steam Engine Base Pattern
« Reply #7 on: July 02, 2012, 05:54:45 PM »
Hi
It is a fair size
I am trying to work out its volume
I can weigh it find out the SG of Oak  then work out its volume
Putting it in to water to measure its displacement is not a good idea
The base will be cast in Aluminium
John
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Offline andyf

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Re: Steam Engine Base Pattern
« Reply #8 on: July 03, 2012, 06:44:42 AM »
If you have a reasonable size offcut of the oak, shaped such that you can easily work out its volume, you could weigh both that and your pattern.  Then, roughly speaking because of your birch ply and filler, the volumes of the pattern and the offcut will be in the same ratio as their weights.

Andy
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I've cut the end off it twice, but it's still too short

Offline doubleboost

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Re: Steam Engine Base Pattern
« Reply #9 on: July 03, 2012, 10:44:43 AM »
Hi
Andy
I was thinking if i weigh the pattern find out the SG of Oak
The formula is
Volume = Weight /SG
John
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Offline andyf

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Re: Steam Engine Base Pattern
« Reply #10 on: July 03, 2012, 03:12:14 PM »
Hi John,

According to my inherited 1941 Machinery's Handbook list of "Average SG of Woods (Dry)":

                                                          Weight per cubic   
                 SG                                    inch (pounds)
Live Oak:    1.15                                          0.042
Red Oak:     0.75                                         0.027
White Oak:  0.80                                         0.029

Hope this helps, though these figures are supposed  to be for dry wood, so I'm not sure what "live oak" is.

Andy
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Sale, Cheshire
I've cut the end off it twice, but it's still too short

Offline Bluechip

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Re: Steam Engine Base Pattern
« Reply #11 on: July 03, 2012, 03:37:50 PM »
If it's from Machinery's Handbook, they could well refer to N. American species  ???

Not sure if they're the same as European Oaks.

Silky Oak is a eucalyptus .... IIRC ..  :scratch:

Long time since I did any wood butchering

BC




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Offline andyf

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Re: Steam Engine Base Pattern
« Reply #12 on: July 03, 2012, 04:00:07 PM »
Quote from: Bluechip on July 03, 2012, 03:37:50 PM
Not sure if they're the same as European Oaks.

Silky Oak is a eucalyptus .... IIRC ..  :scratch:
BC

That's why I suggested weighing an offcut  of the same wood, the volume of which could easily be calculated.
To add to the confusion, Selly Oak is where I spent 3 years at university in Birmingham.  :)

Andy.
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I've cut the end off it twice, but it's still too short

Offline doubleboost

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Re: Steam Engine Base Pattern
« Reply #13 on: July 03, 2012, 04:10:48 PM »
Hi
Had a bit google came up with this
SG of birch ply is 0.67
Pattern weighs 2.2 Kg

Formula is

Weight / SG = Volume

2.2 / 0.67 =1.474 Litres i assume
I can melt 3 litres so it should not be a problem :Doh: :Doh: :Doh: :Doh:
John
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Offline David Jupp

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Re: Steam Engine Base Pattern
« Reply #14 on: July 03, 2012, 05:05:24 PM »
Quote from: doubleboost on July 03, 2012, 04:10:48 PM
2.2 / 0.67 =1.474 Litres i assume
I can melt 3 litres so it should not be a problem :Doh: :Doh: :Doh: :Doh:
John

Problem is that 2.2/0.67 = 3.28  !
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Offline doubleboost

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Re: Steam Engine Base Pattern
« Reply #15 on: July 03, 2012, 05:07:20 PM »
So
It is devided not multiplied
That looks like a better volume :lol: :lol:
John
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Rob.Wilson

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Re: Steam Engine Base Pattern
« Reply #16 on: July 03, 2012, 05:11:16 PM »
 :lol: :lol: ye need a bigger pot John  :poke:



Rob
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Offline doubleboost

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Re: Steam Engine Base Pattern
« Reply #17 on: July 03, 2012, 05:15:30 PM »
You mean like yours :D :D :D :D :D
By the time i get some risers and gates in there it will be a good 4 litres :doh: :doh: :doh:
John
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Offline Bluechip

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Re: Steam Engine Base Pattern
« Reply #18 on: July 03, 2012, 05:20:45 PM »
Quote from: andyf on July 03, 2012, 04:00:07 PM
Quote from: Bluechip on July 03, 2012, 03:37:50 PM
Not sure if they're the same as European Oaks.

Silky Oak is a eucalyptus .... IIRC ..  :scratch:
BC

That's why I suggested weighing an offcut  of the same wood, the volume of which could easily be calculated.
To add to the confusion, Selly Oak is where I spent 3 years at university in Birmingham.  :)

Andy.

Selly Oak ??? That's where Ariel bikes were made.  :thumbup:

I had a 350 Red Hunter, a bloke up the road has a 1937 500 VH.

Did you make it ???  :lol:  :lol:

I'm off ....  :)

BC
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Offline awemawson

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Re: Steam Engine Base Pattern
« Reply #19 on: July 04, 2012, 08:06:57 AM »
You don't need to know the sg of oak. Now it's painted use Archimedes principle to find it's volume. Place a brim full container of water inside a dry bowl. Imerse the pattern so that the water displaced spills into the bowl. Measure the volume of the displaced water - simples !
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Andrew Mawson
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Offline doubleboost

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Re: Steam Engine Base Pattern
« Reply #20 on: July 09, 2012, 04:55:38 PM »
Hi
Decided to modify the furnace and make a bigger crucible
The story in pictures

Furnace extension ring














John
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Rob.Wilson

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Re: Steam Engine Base Pattern
« Reply #21 on: July 09, 2012, 04:57:33 PM »
And i was hoping the patten would come back pink  :lol: :lol: :lol:


Rob
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Offline doubleboost

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Re: Steam Engine Base Pattern
« Reply #22 on: July 09, 2012, 05:08:07 PM »
You seem to have a thing about me and pink  :lol: :lol: :lol: :lol:
I would have thought silver would have been your colour :) :) :) :)
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Rob.Wilson

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Re: Steam Engine Base Pattern
« Reply #23 on: July 09, 2012, 05:17:07 PM »
your missing a photo  :poke:


Rob  :coffee:
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Offline doubleboost

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Re: Steam Engine Base Pattern
« Reply #24 on: July 09, 2012, 05:28:57 PM »
Will this one do

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