owelly
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| posted on 19/4/06 at 03:11 AM |
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Lobster back bends!
Has anyone got a method of making patterns to make lobster back bends?
I made an extention piece to move my throttle body to clear the camshaft pulleys but I'd like to 'bend' it so it's in a better
place for attaching to the AFM.
In the past I have messed around with bits of card to make patterns but if someone had a 'puter program or an easy way, I would be very
greatfull.
Cheers.
http://www.ppcmag.co.uk
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NS Dev
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| posted on 19/4/06 at 09:29 AM |
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off the top of my head won't it be total angle required divided by number of segments required, then divided by 2 to get the angle to set the
saw to?
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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907
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| posted on 19/4/06 at 04:40 PM |
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The more segments you have, the better the flow.
The downside of this is more segments = more work.
22.5 deg is the norm (cut at 11.25 deg)
I cut mine on a band saw. I tack a piece of box on the end of the pipe
so each time you turn the pipe over to make the next cut you can keep
them in line by placing a bubble on the bit of box.
If the cuts are not in line with each other the bend tends to become a spiral.
See cock up below.
Paul G
 
Rescued attachment Lotus-Manifold-s.jpg
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owelly
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| posted on 19/4/06 at 07:14 PM |
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I forgot to mention, I'll be crafting the bends out of sheet steel!!
http://www.ppcmag.co.uk
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907
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| posted on 19/4/06 at 08:32 PM |
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If the pic below is gobbledygook and you cant find anything on the web send me the dims and I'll develop a patten.
I've got a dicky knee at the moment so I cant work on my car. I could do with a desk job.
Paul G
 
Rescued attachment dev-seg-s.jpg
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owelly
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| posted on 20/4/06 at 12:25 AM |
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Cheers 907. I'll have a measure!!
http://www.ppcmag.co.uk
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907
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| posted on 20/4/06 at 04:54 PM |
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I'd need O/D or I/D, thickness of sheet, number of segments, and rad of bend.
atb
Paul G
[Edited on 20/4/06 by 907]
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owelly
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| posted on 22/4/06 at 02:17 PM |
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Here goes Mr G!
the O/D is 78mm.
The thickness of the sheet is 1mm.
Six segments should do it.
And the centerline radius something like 150mm.
I hope this makes some sense?
Cheers, Owelly.
http://www.ppcmag.co.uk
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907
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| posted on 23/4/06 at 10:53 AM |
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Right then Mr Owelly,
I've done the drawings, but if I scan them and print them in Wizard they don't come out the right size.
I scanned and printed them in Photoshop and they are now the right size.
To check the rad is 150mm, the long side of a segment is 50mm, and the short side is 29.5mm.
The length of the developed shape is 242mm.
You need to download and print them without them expanding or shrinking.
Tape the developed shape to a sheet of metal and dot punch through the paper to transfer the shape
onto the metal, then cut it out. You then have a metal template that you can scribe round to make more.
Sorry to anyone else for the big pics.
If you have trouble printing them to size then I'll pop them in the post.
HTH
Paul G
 
Rescued attachment 78mm Bend.jpg
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907
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| posted on 23/4/06 at 10:57 AM |
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I should point out that a six segment bend is five segments, and a half segment on either end.
Paul G
 
Rescued attachment segment.jpg
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owelly
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| posted on 23/4/06 at 08:32 PM |
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You are a beautiful person!
I will repay you in biscuits should we ever meet!!
http://www.ppcmag.co.uk
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907
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| posted on 23/4/06 at 08:51 PM |
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quote:
Originally posted by owelly
I will repay you in biscuits should we ever meet!!
Please keep them in an airtight tin.
I hate soggy biscuits.
atb
Paul G
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owelly
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 posted on 23/4/06 at 08:56 PM |
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U have U2U!!!
http://www.ppcmag.co.uk
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owelly
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| posted on 26/4/06 at 09:00 AM |
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Many thanks Paul! I'll post some piccies very soon!!
http://www.ppcmag.co.uk
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the_parson
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| posted on 27/4/06 at 10:12 PM |
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Did someone mention biscuits?
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907
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| posted on 27/4/06 at 10:16 PM |
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What are you doing up at this time of night??
Hot drink and a digestive and off you go
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rusty nuts
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| posted on 28/4/06 at 06:26 PM |
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Sounds like Geoff may have competition!
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907
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| posted on 28/4/06 at 07:19 PM |
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quote:
Originally posted by rusty nuts
Sounds like Geoff may have competition!
No way.
Geoff pales into insignificance.
Huntley & Palmers deliver direct to Nick's house.
Paul G
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owelly
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| posted on 5/5/06 at 01:26 AM |
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Here's the finished lobster!!
But I forgot to deduct the angle of the end of the air plenum so the TPS was too close to the cam pulleys. That's what happens when to take
things to work to make when to car is at home!!
So I swiftly chopped a segment out and zapped it with the MIG.
Many thanks to Paul G!!!
[Edited on 5/5/06 by owelly]
http://www.ppcmag.co.uk
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David Jenkins
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| posted on 5/5/06 at 07:14 AM |
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Does that welded word on the frame really say "LARD"?
David
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MikeR
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| posted on 5/5/06 at 07:38 AM |
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Of course it does.......
LARD - Left Assembly, Right Down.
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owelly
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| posted on 5/5/06 at 08:26 AM |
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LARD!!
I weld LARD into everything! Trailers, cars, boats, hats etc.....
It's a throwback from the days of Team Lard Racing, which was a bunch of hopeless baffoons packed into the Lardy-Van with a load of crusty old
racing motorbikey things. It's a good way of recognising things after they get stolen!!
http://www.ppcmag.co.uk
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MikeR
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| posted on 5/5/06 at 04:57 PM |
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can't argue with the idea
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wilkingj
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| posted on 5/5/06 at 06:54 PM |
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ARRRRGGGHHHHH!!!!!
I am insignificant now!!!
Huntley and Palmer... Pooh!!
Hob Nobs forever
quote:
Originally posted by 907
quote:
Originally posted by rusty nuts
Sounds like Geoff may have competition!
No way.
Geoff pales into insignificance.
Huntley & Palmers deliver direct to Nick's house.
Paul G
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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