paul
Member
Posts: 8
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Post by paul on Mar 5, 2008 11:08:45 GMT
The part at top is bent through 90 degrees to form the part at the bottom. Please tell me that the 1 and 23/64" dimensions on the bent part are wrong, I've been staring at this drawing for too long...
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Post by baggo on Mar 5, 2008 11:21:15 GMT
Hi Paul,
Is it possible the part is meant to be trimmed to the lengths given after bending? It would be tricky to accurately predict the original length needed before bending.
John
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paul
Member
Posts: 8
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Post by paul on Mar 5, 2008 11:34:05 GMT
I think you've hit the nail on the head there John - checking back to the original plans it has the words 'actual size' beneath so that bottom one must be trimmed to length as you say. Thank goodness for that, I thought I was losing the plot!
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Post by havoc on Mar 5, 2008 11:34:33 GMT
Even if it wasn't meant to be done that way, I still would do it that way! Trim after bending looks the only way to make sure.
Paul, can't you make out the correct dimensions from other pieces? You must have somewhere on the plan how this is supposed to fit into the whole.
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paul
Member
Posts: 8
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Post by paul on Mar 5, 2008 12:36:17 GMT
Havoc you're right I'm not going to make it like that, I'll be using a 'box' with threaded holes in two faces in place of the bent 'elbow', I just needed to get the final dimensions right before converting to metric
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Post by circlip on Mar 5, 2008 15:24:08 GMT
You're going to need a large can of oil for this one Paul, they are supposed to chuck oil all over when they are running. You do pick em. PS you're going to need a lot bigger boiler to run this one, Regards Ian. PPS I've seen one with just one end tapped and fixed to the reduced end of the other part. PPPS. I think i'd try to do it like in the picture, just make sure it's bent at 90 and flat in the other axis.
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paul
Member
Posts: 8
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Post by paul on Mar 5, 2008 15:32:42 GMT
You're going to need a large can of oil for this one Paul, they are supposed to chuck oil all over when they are running. You do pick em. Haha, yeah I've seen one spraying it around but the mechanism looks great. Requires about 30-40 psi according to the article so you're right about the boiler
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Post by dickdastardly40 on Mar 6, 2008 7:43:38 GMT
Is this for an Elbow engine Paul? How many elbows do you have to make?
Al
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paul
Member
Posts: 8
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Post by paul on Mar 6, 2008 7:49:16 GMT
Yep that's it Al, I'd need 3.
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Post by Shawki Shlemon on Mar 6, 2008 9:29:16 GMT
When metal is bent ,the total of the two sides are not equal to the total length of the original metal , there is bend allowance to be calculated .I haven't done this for long time ,I now use the method described above , make it longer and trim to the job . however to me the figures do look wrong as the original length should be less than the total of two sides .
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Post by Tel on Mar 6, 2008 10:00:55 GMT
yep the 'Incredible Elbow Engine' wot's it good for? Making your friends go 'Wow' according to the original P.M blurb, of which I still have a copy here lying around somwhere
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paul
Member
Posts: 8
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Post by paul on Mar 6, 2008 13:02:22 GMT
yep the 'Incredible Elbow Engine' wot's it good for? Making your friends go 'Wow' according to the original P.M blurb, of which I still have a copy here lying around somwhere Anything will six cylinders and only five moving parts has to be impressive ;D
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Post by circlip on Mar 6, 2008 13:22:06 GMT
Your maths certainly DOES need refreshing Paul, SIX cylinders and FIVE moving parts, is the sixth cylinder just for show? Anyway, you've set yourself a task if a mere woman ( no I'm NOT being sexist or chauvinistic to our female members ;D) can build one and win a comp with one in TLOTF. ;D ;D ;D BTW, the neutral axis for bend radii is two thirds up from the base, ie 2/32"
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paul
Member
Posts: 8
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Post by paul on Mar 6, 2008 15:43:33 GMT
Your maths certainly DOES need refreshing Paul, SIX cylinders and FIVE moving parts Each of those bent bits is two pistons and there are two cylinder 'barrels' (three bores in each) = 5 moving parts Woman? Competition? What ARE you banging on about? ;D
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