showmans cylinder block !!!

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showmans cylinder block !!!

Post  craig@STW on Wed 11 Aug 2010, 12:51 pm

the sample casting for the cylinder block arrived today. what will we be doing with this one ??? believe it or not we will be chopping it up into quarters affraid affraid








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Hung, drawn & quartered

Post  Steve Traill on Wed 11 Aug 2010, 2:55 pm

Shouldn't you hang it first before quartering it, I'm assuming it had a fair trial of course!

I expect Steve has drawn it on his computer........ha ha

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Re: showmans cylinder block !!!

Post  sonick45 on Wed 11 Aug 2010, 8:46 pm

I'm no expert on these things, other than it needing considerable cleaning up around the edges what's wrong with it?




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Re: showmans cylinder block !!!

Post  craig@STW on Wed 11 Aug 2010, 11:46 pm

we need to cut it up so we can check all the internal steam chambers. there's no other way to guarantee that the casting is correct other than build the model and hope for the best.

its had the chop now so I'll take some pics and post them tonight Cool

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Re: showmans cylinder block !!!

Post  Vapor on Thu 12 Aug 2010, 12:19 am

Blimey vasectomised cylinder affraid affraid

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Re: showmans cylinder block !!!

Post  highpressure on Thu 12 Aug 2010, 12:39 pm

I think youre getting confused betwen chops and snips!!!!

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Re: showmans cylinder block !!!

Post  craig@STW on Fri 13 Aug 2010, 12:08 am

right, as promised, photos of the cylinder block in sections....










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Re: showmans cylinder block !!!

Post  Vapor on Fri 13 Aug 2010, 6:47 am

Craig,

Whats the wire in the ports for??

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Re: showmans cylinder block !!!

Post  craig@STW on Fri 13 Aug 2010, 9:09 am

not actually sure ??? maybe something to do with the casting process. Steve will know Neutral

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Re: showmans cylinder block !!!

Post  craig@STW on Mon 13 Dec 2010, 2:15 pm

OK, we have had the next batch of 5 "revised" castings arrive and two have got the chop...











the 3 remaining castings need to be fully machined as soon as possible so we can fully prove the casting before ordering the full batch. these things are not cheap.

we will be machining these with the knowledge that we may come across "problems" that need sorting and we will keep you informed on how things go.

the wires are there to hold the various parts of the mould in place during the casting process and they "should" fall away as the machining progresses.

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Re: showmans cylinder block !!!

Post  craig@STW on Tue 21 Dec 2010, 2:13 pm

machining of the blocks is underway. the blocks are very large and very heavy and Mark is having to make some heavy duty jigs as he goes along. also having to use some very long tools !!!!

mark keeps a careful watch as the tool gets lower...



machining of the saddle must be done in the same op as the bores....


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Re: showmans cylinder block !!!

Post  Tim Watson on Wed 22 Dec 2010, 1:15 am

Interesting tapers on the cylinder bores. I presume this is to get a 'draw' for the moulding as well as to get sufficient metal volume in an area which could be inaccessible to molten metal in the casting. Will the cylinders have liners?

Tim

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Re: showmans cylinder block !!!

Post  Steam Traction World on Wed 22 Dec 2010, 6:49 am

Hi Tim

The bores are actually parallel. It just the way they've been cut with the hacksaw that makes them appear tapered. There are no liners. The bores are machined straight into the block. Thats part of the reason why there are so many cores. After they're machined we intend to send the castings away for a very special process that will hopefully block up any porosity within the iron.

Regards

Steve

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Pistons

Post  Tim Watson on Wed 22 Dec 2010, 8:10 am

Don't forget to make the pistons out of Dural! A lIghtweight piston made a big difference to my TE.

Tim

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Re: showmans cylinder block !!!

Post  sonick45 on Wed 22 Dec 2010, 8:27 am

Tim Watson wrote:Don't forget to make the pistons out of Dural! A lIghtweight piston made a big difference to my TE.

Tim

My Uncle is a retired aerospace designer/engineer and now concertrates on his hobby of large scale model flying.

He uses this stuff all the time and it's amazingly light for it's overall strength.

For those that haven't come across this alloy before here it is.

CLICK HERE


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Re: showmans cylinder block !!!

Post  craig@STW on Sun 09 Jan 2011, 3:53 am

mark is still working on the trial cylinders and they are really starting to look the part now. i think these three will end up as scrap for various reasons but there is nothing that cant be sorted with a few casting tweaks or machining changes.

one example that happened on Friday is the drilling of the drain holes. they are drilled with a long 4mm drill to over 100mm deep and on the first attempt the drill snapped off deep in the hole. now that we know this is likely to happen there are things we can do to prevent it on the full batch






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Re: showmans cylinder block !!!

Post  craig@STW on Mon 17 Jan 2011, 12:43 pm

the trial cylinders are now done. Steve has made a few small alterations to the casting and we have had one of the moulds back so we can make the modification...



the tubes that you can see have been added to reduce the size of the mould. these were skimmed off to make "half tubes". this needed to be done to both halves of the mould.

this has now gone back to the casters so they can start on the proper batch Cool

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Re: showmans cylinder block !!!

Post  craig@STW on Wed 16 Feb 2011, 12:12 pm

the first four castings have arrived cheers


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Re: showmans cylinder block !!!

Post  Vapor on Thu 17 Feb 2011, 12:19 am

Blimey Craig thatís a big dollop of metal how much do they weigh?? You could sell the scrap ones as boat anchors, or even raffle them. Very Happy Very Happy


Last edited by Vapor on Thu 17 Feb 2011, 12:19 am; edited 1 time in total (Reason for editing : spelling mistake)

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Re: showmans cylinder block !!!

Post  Graeme81 on Thu 17 Feb 2011, 1:21 am

if this has been covered elsewhere then please feel free to ignore this question:
are the RL and showman's engines going to be true compounding engines and if so what will be the working boiler pressure? Question
thx

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Compound

Post  lynnr on Thu 17 Feb 2011, 1:30 am

Graeme81 wrote:if this has been covered elsewhere then please feel free to ignore this question:
are the RL and showman's engines going to be true compounding engines and if so what will be the working boiler pressure? Question
thx

Thank you graeme for the vote of thanks. I promise to get more pictures up once I have more bits to play with Very Happy
I am also thinking of a small quiz using macro photography of engine parts Twisted Evil

From reading the product pages. Yes they are compound and work at 170psi.

Hope your exile/sentence in the USA is going pleasantly.

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Re: showmans cylinder block !!!

Post  highpressure on Thu 17 Feb 2011, 10:19 am

I saw these today in the flesh and they look very nice indeed, as for weight I couldnt pick it up easily so I reckon at least 40 ish KG. I said to Steve I hoped nothing else came in the box with it as they would never move and he said its a kit in its own right. Neutral Lots of work to do them though but will be the muts nuts. Very Happy

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Re: showmans cylinder block !!!

Post  craig@STW on Tue 15 Mar 2011, 2:28 pm

we now have 14 cylinder castings in the factory. just waiting for the next 10 to arrive and then machining will start. these are likely to be the first things machined in the new factory !!!!


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Re: showmans cylinder block !!!

Post  bjwlancashire on Tue 15 Mar 2011, 2:31 pm

Craig

What do the cylinder blocks weigh??

Brian

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Re: showmans cylinder block !!!

Post  craig@STW on Tue 15 Mar 2011, 2:35 pm

quite a lot !!!!

i'll stick one on the scales tomorrow and find out. then i'll do the same once they are finished to see how much weight they have lost (as long as someone reminds me Embarassed )

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Re: showmans cylinder block !!!

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