New to this
Printed From: BHPC Forum
Category: Archive (pre-February 2015)
Forum Name: The BHPC
Forum Description: Discussion about the club
URL: https://forum.bhpc.org.uk/forum_posts.asp?TID=4264
Printed Date: 27 March 2026 at 2:18am
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com
Topic: New to this
Posted By: Shiner
Subject: New to this
Date Posted: 03 April 2011 at 1:56pm
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Hi, Im Paul from Clitheroe Lancashire.
Im new to all this and would like to get into a bit of racing etc...
I do a bit of normal.. cycling.. And take my disabled friend to Handcycle meets in my van alot..
But looking at your machines, I think Its time I got myself a new toy.. a Recumbent racer of somekind. Firstly, Where can I buy one, or do I build one? If so.. Is this the place to get all the help I need?
Im not the best mechanic in the world.. But thanks to a keen stepfather Im fully 'tooled up'
Im looking to make, build, buy a low down two wheeled rucumbent racer..
Any help would be brilliant thanks..
Look forward to meeting a few of you at Preston / Lancaster
Paul ------------- Stranger things have happened! |
Replies:
Posted By: tosgh
Date Posted: 03 April 2011 at 2:38pm
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Hi Paul,
some people have a crack at making a recumbent from the start but before going down that route you really need to try out different configurations first. Come to one of our race meets near you or get in touch with one of our local reps and try as many as you can first to see which ones suit you best. ------------- weight is everything |
Posted By: Shiner
Date Posted: 03 April 2011 at 2:40pm
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Thanks! Whos my local Rep and how do I contact them? ------------- Stranger things have happened! |
Posted By: AlanGoodman
Date Posted: 03 April 2011 at 2:58pm
I don't think there is a rep in that part of the country at the moment unfortunately... 
I'd agree with tosgh... Have a go on as many as you can...
Have you ridden any recumbents at all yet??
You might find it better/easier to start with something a little higher and more upright, especially if you are going to ride it on the road as well as the track...
Hillingdon (our first event) is a very long way from you but the next two (Darley Moor and Stourport) are a bit nearer and might well be worth the trip...
------------- |
Posted By: Shiner
Date Posted: 03 April 2011 at 3:17pm
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Yes of course! Ill try and make it... I was looking to build something more of the track really, and as far as ever being on a Recumbent goes.. Ive only been on an aray of 3 wheeler hand cycles... ------------- Stranger things have happened! |
Posted By: AlanGoodman
Date Posted: 03 April 2011 at 3:20pm
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Definitely need to see what you feel comfortable on then... Any of our events will give you a good chance to see a wide range of weird and wonderful(???) machines... ------------- |
Posted By: Shiner
Date Posted: 03 April 2011 at 3:35pm
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Brilliant.. I think im more for building my own now.. as they can be very expencive 'off the shelf' good job we have a carbon fibre expert in the family.. But your right, Ill come try a few out first! ------------- Stranger things have happened! |
Posted By: GeoffBird
Date Posted: 03 April 2011 at 7:49pm
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Hi Paul of Clitheroe. You can sometimes pick up a second-hand low-racer at a good price, but, with the number out there being so small, the chances of something suitable for you coming along at the right time is correspondingly small. I'd always encourage people to build their own - there is nothing more satisfying than powering along on a machine you have designed and built yourself, especially if it turns out to be faster than the shiny cabonfibre TT bikes in your local bike shop! It can also be frustrating if you go about it the wrong way or underestimate the task. This is THE place to come for advice on building your own bike - there is a lot of experience of this in the club - so, please ask as many questions as you wish. The club magazine also has lots of articles on building bikes. Using composites like carbonfibre can actually be the easiest way to build a one-off, as you don't have to deal with weld distortion - the enemy of the homebuilder wanting a good-handling bike. Having said this, all my bikes have had steel frames. Tell us what you have in mind and we should be able to help you to avoid the pitfalls. ------------- Right Time - Right Place - Wrong Speed |
Posted By: Shiner
Date Posted: 03 April 2011 at 10:04pm
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Well, I was going to make one 'at first' from steel.. on a tight budget from all the junk bikes and bits ive got all over the workshop!!
I have seen a few on facebook like this.. ------------- Stranger things have happened! |
Posted By: GeoffBird
Date Posted: 03 April 2011 at 11:04pm
Well, I'd urge that you to make some sort of jig, to hold the bits in the right place, even if it's just made of wood. And try to weld symmetrically - not all one side and then the other, or it'll go banana-shaped  And I'd plan something out on paper first, to get everything in the right place.
------------- Right Time - Right Place - Wrong Speed |
Posted By: Shiner
Date Posted: 03 April 2011 at 11:16pm
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Going to get a bit of practice on the welder tomorrow! ------------- Stranger things have happened! |
Posted By: GeoffBird
Date Posted: 03 April 2011 at 11:19pm
Good man - go for it! 
------------- Right Time - Right Place - Wrong Speed |
Posted By: NickM
Date Posted: 04 April 2011 at 9:19am
| I'm not a home builder, but if I ever get round to it http://www.amazon.co.uk/Atomic-Zombies-Bicycle-Builders-Bonanza/dp/0071422676/ref=sr_1_1?ie=UTF8&qid=1301905076&sr=8-1 - this book is full of what seems to be useful, practical advice on turning junk frames into interesting bikes - several of the designs in it are for recumbents. |
Posted By: Shiner
Date Posted: 04 April 2011 at 5:22pm
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Cheers, Ive had a practice on all my junk.. trying to build a 'learning curve' bike for dirt cheap! ------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 04 April 2011 at 9:23pm
This will be my TEST bike... YOU THINK IM MAD RIGHT??? ------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 04 April 2011 at 9:25pm
SO FAR.... SO GOOD
Did a wee bit of chop and weld.. going to attach a BMX crank to the front tomorrow.. ------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 04 April 2011 at 9:26pm
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PS.. Handlebars are not staying.. there going to go under slung ------------- Stranger things have happened! |
Posted By: GeoffBird
Date Posted: 04 April 2011 at 11:35pm
Fast work! 
------------- Right Time - Right Place - Wrong Speed |
Posted By: Shiner
Date Posted: 04 April 2011 at 11:46pm
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Thanks, Now Im a bit puzzzled on how to manipulate the chain so it wont get in the way! ------------- Stranger things have happened! |
Posted By: GeoffBird
Date Posted: 04 April 2011 at 11:57pm
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Is the boom for the new bottom bracket going to be longer? - Think it may need to be. As far as manipulating the chain goes, you will need a pulley to direct the top (drive) run of the chain through the rear triangle. If the pulley is mounted on one side only then you need to use an 8mm or 10mm bolt, as its under quite alot of load. Does anyone know a cheap source of a suitable pulley? I've got one you can have, but it's soft plastic, so won't last that long. Gimme your address (PM) and I'll post it to you. Or you could put an intermediate drive in the old bottom bracket, with a double chainset (saw cranks off)? The lower, return chain run could just be supported by an old rear derailleur pulley, to clear the front wheel. ------------- Right Time - Right Place - Wrong Speed |
Posted By: Shiner
Date Posted: 05 April 2011 at 12:01am
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Thanks! ------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 05 April 2011 at 5:30pm
Yeay
Crank is Own... LOL! ------------- Stranger things have happened! |
Posted By: bazz
Date Posted: 05 April 2011 at 8:00pm
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Good job Paul.
At the rate you are going you will ready to race in a week
 Take care,
Barry ;-)
|
Posted By: Shiner
Date Posted: 05 April 2011 at 8:02pm
Well being a car valeter, this rain has give me a week free to get on with it.. So far ive spent a Tenner!  Hopefully Ill be able to ring next week!------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 06 April 2011 at 8:44pm
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I mean, riding it next week.. Started on the seat today, with yet more scrap!! I wonder just how cheap you can make a Recumbent? £50? we shall see! ------------- Stranger things have happened! |
Posted By: SteveArmstrong
Date Posted: 06 April 2011 at 10:16pm
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< ="-" ="text/; =utf-8"> Hi all, I see your not wasting any time on your
build, Paul, Steve. |
Posted By: Shiner
Date Posted: 06 April 2011 at 10:49pm
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Just using a stick welder.. I am no welder either.. This is my first try, we have Mig and Tig welders in the workshop, But the stick welder looked the simplest to use..
Your build sounds good.. Ill be doing one from scratch soon, see how this steel one works out.. Im just proving that it can be done on the cheap thats all.. ------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 07 April 2011 at 4:10pm
 SEAT BASE DONE!!! NOW I NEED TO MAKE SOME HANDLE BARS!! (ones showen are for wheeling arround the yard)
Then I need to put on chain, brakes and gear switch, and Im away!!!!
Onece finished, Ill strip it all down and paint / polish it up... Then we can think about aerodynamics!
Paul ------------- Stranger things have happened! |
Posted By: AlanGoodman
Date Posted: 07 April 2011 at 4:13pm
Excellent!  That's a pretty extreme seat angle!So you'll be wanting a race number for Hillingdon then??.... ------------- |
Posted By: Shiner
Date Posted: 07 April 2011 at 5:18pm
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Not just yet.. I need to know if its safe! lol
Also, what requirments are needed to take part, lights? brakes? flag? etc etc.... ------------- Stranger things have happened! |
Posted By: AlanGoodman
Date Posted: 07 April 2011 at 6:28pm
Race starts at 11:30 so you won't need lights unless you're REALLY slow...  You will need brakes and a guard to protect your rivals from the pointy bits at the front, and also some way of mounting some numbers... The rules and various classes can be found http://www.bhpc.org.uk/rules-and-classes.aspx - here ... ------------- |
Posted By: KevinJ
Date Posted: 07 April 2011 at 8:36pm
There was a back to back tandem that was pop riveted aluminium (since it was a Dutch one you may find it under "rug aan rug". There used to be a pdf for its design around as well and you may well still find it out there somewhere. Although it was a tandem it would be easy to make it as a single bike from the two ends. A picture is http://www.legslarry.beerdrinkers.co.uk/whpvc2001/MartinLeVoi/martinlevoi003.html - here . It might give you some ideas ------------- Kevin Jenkins Windcheetah |
SteveArmstrong wrote:Posted By: bazz
Date Posted: 07 April 2011 at 8:39pm
That's darn quick work Paul, it's hard to keep up with you, no doubt you will have it finished by the time I post this  .
Justa coulple of points that may be worth considering; maybe.
I would make sure that you are able to see over, around or through the front end of your bike, with you seat so reclined you may struggle to see the track or road in front of you, this may also make for a very sore and tired neck with out a neck or head rest to support you.
Have you tried lying on the bike in a riding position to check the seating position? you may find it easier to ride (at first) a little less layed back. on the plus side though it will be a very aero position (so long as the blood does not all drain to your head)
 If you have never riden a recumbent before it may also be wise to be aware of the crank, pedal, foot interference with the wheel, it is not so much a problem when riding normally, but can cause problems if going slow and turning tightly whilst still pedalling, the first time it happens can be very un-nerving if not aware of it; and an abrupt stop or loss of balance followed by cursing can be side effects of it.
I look forward to seeing how the bike works out.
Take care,
Barry ;-)
|
Posted By: Yowie
Date Posted: 07 April 2011 at 8:42pm
| Great work Shiner. With that seat back angle you will certainly need a headrest or a comfy neckrest. The rules don't require it, but a mirror is very useful. Take a Look is good for spectacle/shade wearers. Blackburn and Third Eye also. On-bike options include Mountain Mirricle and Busch+Muller (B&M) models. |
Posted By: bazz
Date Posted: 07 April 2011 at 8:44pm
How Do Kevin,
Thanks for posting the link to the pictures, I have not seen these before even though I have looked through Dave's Web Site many Times.
Take Care,
Barry ;-)
|
Posted By: GeoffBird
Date Posted: 07 April 2011 at 8:55pm
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KevinJ wrote: "There was a back to back tandem that was pop riveted aluminium..." I saw a solo recumbent bike made this way in Denmark many years ago. Looked like it had been made by the guys who make LCR racing sidecars in Switzerland, as it was anodised black in the same way - very smart.  ------------- Right Time - Right Place - Wrong Speed |
Posted By: Shiner
Date Posted: 07 April 2011 at 9:08pm
JUST SHOWING YOU HOW THE ACTUAL STEERING WORKS ON A PIVOT!
 THANKS FOR ALL THE SUPPORT GUYS!!!
LOL @ BAZ... You are right I am nearly finished...
Ive taken into account about the pedals making contact when steering sharply.. Its something ill have to get used to on my quiet road...
And I am currently in the prosess of making a nice headrest so I dont have to see the sky all day!
Thanks again, Paul! ------------- Stranger things have happened! |
Posted By: homebrew
Date Posted: 07 April 2011 at 9:47pm
 looks like you got a pic of my first love there geoff,looking good there shiner
jon ------------- oke-ja x2 helium frog self built swb and counting |
Posted By: GeoffBird
Date Posted: 07 April 2011 at 11:23pm
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Looking good Paul, especially in the time! Guess the pulley hasn't arrived yet. Maybe tomorrow... Jon - I had no idea  ------------- Right Time - Right Place - Wrong Speed |
Posted By: Shiner
Date Posted: 07 April 2011 at 11:26pm
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Cheers Geoff!! Then the chains going on, and ill se if it rides ok.. then a few tweeks, and ill strip ready for tarting up.. by then the gear and brake cables should be here!! ------------- Stranger things have happened! |
Posted By: SteveArmstrong
Date Posted: 09 April 2011 at 3:13pm
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Thanks Kevin. I've had a look round for that tandem and I've dug up a few references. I found a link to some plans but it has since expired. One site mentions that it is aluminium over a foam core with a steel subframe, but no more details. I'd be curious to know how they cut and shaped the top and bottom pieces of aluminium for riveting. I imagine lots of little individual cuts and bends might create lots of points for stress concentration. That's quite a decent looking side car Geoff. I used to live on the Isle of Man and got to see a lot of these during TT week .Sounds like you're very well kitted out, Paul. I'm still waiting around for my delivery of plywood, which should have arrived this morning. What are you thinking for streamling? I've been reading The Leading Edge by Goro Tamai after looking over Miles Kingbury's write up on building a quadcycle, http://www.bhpc.org.uk/quattro.aspx It's explained a few things that I've not seen in more standard areodynamics text books, and its very comprehensive if you like that sort of thing. There are some good links on making Coroplast fairing on this facebook page, https://www.facebook.com/home.php#!/group.php?gid=15644592486&v=app_2373072738 Steve. |
Posted By: Shiner
Date Posted: 09 April 2011 at 5:15pm
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Pully arrived yesterday Thanks Geoff... Chains on and the bike rides, the problem is the riders not used to it.... lol.. Ive started on making a neck support now so I dont end up in A&E with my head stuck looking down!!
Seeing its a nice day. And my bike goes forwards.. Ive decided to give it a splash of colour ''what I found under the sink!'' as Im penny pinching with this prototype...
 Tomorrow I will re build, and start putting the brakes and 3 speed back together..
Then finish said headrest, change the pedals and pad the seat... Don't let me forget ''chain guard''
DONE in a week... BISH BASH BOSH!!!
------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 10 April 2011 at 6:02pm
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   A FEW PICS OF THE FINISHED ARTICLE... OR IF YOU LIKE VIDEOS???? ILL UPLOAD ONE IN A SEC
THERES STILL A BIT MORE PULLY AND CAIN WORK TO BE DONE TO MAKE IT SAFER.. BUT IT WORKS!
------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 10 April 2011 at 6:07pm
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http://www.youtube.com/watch?v=ihXWFWjbz5k - http://www.youtube.com/watch?v=ihXWFWjbz5k
Please excuse my stepfathers language... If your easily offended he says 'D**k Head'
thanks, Paul... ------------- Stranger things have happened! |
Posted By: Yanto
Date Posted: 10 April 2011 at 7:21pm
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been watching the build wth interest, well done!!! And you can ride it!!!
|
Posted By: GeoffBird
Date Posted: 10 April 2011 at 7:32pm
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Could be the record for the fastest recumbent build in history Paul! Looks very tidy. Steve - Marloes Dries has kindly sent me a PDF of the back-to-back tandem plans in response to your request. PM me with an email address and I'll send them to you. ------------- Right Time - Right Place - Wrong Speed |
Posted By: SteveArmstrong
Date Posted: 10 April 2011 at 7:53pm
| Looks fantastic Paul! I like the skull details. Perhaps there is room for a new race category here, one where you start without a bike and have to build it before racing to the finish. |
Posted By: Shiner
Date Posted: 10 April 2011 at 8:38pm
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One week exactly! thanks all again.. the red paint and skull stickers were found under the sink, I basicly used what I could lay my hands on!
Few issues to address.. I need another pulley (smaller one) to lift the chain off the forks, and get my 3 speed hub all wirded up so I can used 2nd and 3rd and test it at some real speed!!
So its not technicaly its not quite finished.. I cant wait untill its 'road safe' and I can really see what it can do...
{Did any of you spot a change?}
I had to raise the seating possition as the wheel base is so short, there was no weight over the front and it just fell over at the slighest wobble! Raised seat.. sorted!
Paul H ------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 10 April 2011 at 8:41pm
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Im up for the new bike building race idea!! Le mans style.. but instead of running your building! ------------- Stranger things have happened! |
Posted By: bazz
Date Posted: 11 April 2011 at 7:07am
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How Do Paul,
Congrats on making £30.00 priceless in one week
The seat angle looks better now; and can make a hell of a difference on a new ride. if you wanted to recline the seat at a later date you would probably find balance less of a problem once You are accustomed to the machine, you also look pretty comfortable riding it.
Deffinitely not a Duck Head
Take care,
Barry ;-)
|
Posted By: Shiner
Date Posted: 11 April 2011 at 9:29pm
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Thanks, Ill post a new video when I have all three speeds working... and the chain in the right area.. also a few little tweeks and jobs a good en... I dunno what speeds I can expect from it, Ill have to buy a speedo..
Thanks for all the encouragement from you all.. and thanks Geoff for that nice pulley! ------------- Stranger things have happened! |
Posted By: Shiner
Date Posted: 11 April 2011 at 10:17pm
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So I guess i should join the club now! ------------- Stranger things have happened! |
Posted By: AlanGoodman
Date Posted: 11 April 2011 at 10:19pm
Go on then - We'll even teach you the secret handshake if you come to Hillingdon... ------------- |
Posted By: SteveArmstrong
Date Posted: 21 April 2011 at 2:21pm
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I don't suppose anyone knows a good supplier of aluminium around the North West (or anywhere UK)? I'm trawling through websites and yell.com here, and drawing a lot of blanks trying to get 6160 T6 or similar grade in sheet form. Some sites don't quote a grade so I'm presuming its pure aluminium. I also joined the club today. I take it that paypal automatically includes your address with your payment, as I wasn't asked for one during the process. Best, Steve |
Posted By: GeoffBird
Date Posted: 21 April 2011 at 8:15pm
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I very much doubt alumimium sheet would be pure aluminium, unless it has specialist uses - maybe architectural, because of its better corrosion resistance. Most likely to be 6061/3 or 6082 T6 (Used to be called HE30). 2014 T6 (HE15) is much stronger but hard to bend and you can't weld it. If you want small quantities it is always worth trying local engineering or fabrication companies - they may sell you offcuts. I asked Fiona (membership sec.) about your Paypal question. She's not sure but Heather should know ------------- Right Time - Right Place - Wrong Speed |
Posted By: AlanGoodman
Date Posted: 21 April 2011 at 8:18pm
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The address you have registered with Paypal will have been sent to us... ------------- |
Posted By: bazz
Date Posted: 21 April 2011 at 8:29pm
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How Do Steve; and welcome
Don't quote me on this; but I think paypal does include an invoice address to the merchant.
I have bought several lengths of aluminium, in flat bar, tube, angle and rod from
http://www.metals4u.co.uk/ - http://www.metals4u.co.uk/ in the past, the grade was 6063 or 6082 depending on what stock is available, I seem to remember that the 6082 has been seen to replace the 6061 alloy. you can find data sheets on the site, or I can email you them if you cant find them.
All the material was clean and quickly delivered.
I used the flat bar for making truck brackets on one of my custom long distance pumping skate boards, it was easily cold formed and has put up with many miles of repeated flexing and vibration under load and and still going strong after 2 years, (maybe relevant or not as the case may be)
I hope this helps?
What'cha making?
Take care,
Barry ;-)
|
Posted By: SteveArmstrong
Date Posted: 23 April 2011 at 7:50pm
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Thanks all. Re: the address, I found and used the enquiries@bhpc.org.uk email shortly after I posted on the forum and Heather got back to me very quickly. As you say, Paypal does include the address and I had actually sent the wrong address (I've only used it once before and that was a year ago) but all sorted now. Thanks for the heads up about HE30 and 15, Geoff. I did notice this on my internet travels but hadn't heard the terms before. I saw a few references to various 1000 grade aluminium which I understood was virtually pure aluminium. I had seen metals4u, Bazz, but I couldn't find what grade they were selling. But I've just found the data sheets right at the bottom of the page under 'technical' in tiny writing. 6082/3 looks good, so thanks for the pointer. I've several recumbent designs on the drawing board with a view to using pop riveted aluminium. I'm going to start with a basic swb rear drive for simplicity. I'm doing a wooden mock first to get the sizing right. Perhaps I can get some photos up next week. I'm also looking at a monocoque aluminium design that can be sat within as a streamliner. This monocoque can provide roll / crash protection and need not be streamlined. A two part, single join vac formed jacket that fits over it could then give a more idealised aerodynamic profile. I'm wondering if this might prove to be easier than a carbon / kevlar / fibreglass approach. It might also allow for different profiles to be experimented with without too much hassle. Maybe, haha. I'd also love to try building a pop riveted Velocraft NoCom clone. Its such an irresistibly lovely looking machine (pipe dream). Getting some aluminium through the door will be a good start. Best, Steve. |
Posted By: Crossie
Date Posted: 23 April 2011 at 9:32pm
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Hi Steve,
you could try http://www.aluminiumwarehouse.co.uk - www.aluminiumwarehouse.co.uk who are very helpful,deliver quickly,various grades available sheet/bar/extrusions
or
for higher strength[aircraft grade] http://www.pfametals.com - www.pfametals.com though these are obviously more expensive.
I have used both suppliers many times with no complaint
Crossie
|
Posted By: bazz
Date Posted: 24 April 2011 at 7:53am
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Good stuff Steve; looks like you have enough projects and ideas to keep you going for a long while, Looking forward to seeing what roll's off the production line first
Thanks for the extra links Crossie; you can never have too many good resources
 Take care,
Barry ;-)
|
Posted By: graydog
Date Posted: 24 April 2011 at 8:29am
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My main supplier was in Cardiff originally call C G Rees back have change name now so google. Usually very goi. On price ( in my experience)
I find much like others it is better to drop in and get off cuts in terms of price. But take care as some times you buy more then you need and it may have been cheaper to just order the cut size. I have no good supplier in north Wales yet. |
Posted By: SteveArmstrong
Date Posted: 26 April 2011 at 2:58pm
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Thanks Crossie. I came across aluminium warehouse, but pfa metals I hadn't, and is more what I had in mind. It is a bit more expensive so I will have to juggle cost / benefit on performance here, given that it's the first build. I think its time to get some quotes and then check some local firms for off cuts, then at least, I'll have a bench mark price to work from. Thanks graydog. |
Posted By: Shiner
Date Posted: 26 April 2011 at 9:36pm
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Post theft!!
Shoulda called it ''new to this alu sheet''
LOL ------------- Stranger things have happened! |
Posted By: martinbguk
Date Posted: 27 April 2011 at 11:00am
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5251 (NS4) is also good for doing riveted tub work. ------------- HRSO2 No 59 www.mbg-recumbent-racing.blogspot.com |
Posted By: SteveArmstrong
Date Posted: 28 April 2011 at 10:47am
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Thanks Martin, I'll look into that. Haha, you can always Steel it back again, Shiner. |
Posted By: Shiner
Date Posted: 01 May 2011 at 6:05pm
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Hay, been a while and had the bike out and about for testing.. But now I think its time to make the racer I wanted!
If anyone wants my bike for what ever reason Ill gladly sell it for a reasonable price! Just need a 3 speed shifter fitting for about £16..
Open to offers, now watch this space for my next project!
Thanks, Paul ------------- Stranger things have happened! |
Posted By: GeoffBird
Date Posted: 27 May 2011 at 8:09pm
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martinbguk wrote: "5251 (NS4) is also good for doing riveted tub work." I'm told you should cover it in soap where you intend to bend it and heat it until the soap turns black, which anneals it, making it easier to bend. Bending it will work-harden it. Have I got this right Martin?? I think you should buy it in the 'half-hard' condition for folded sheet structures. ------------- Right Time - Right Place - Wrong Speed |
Posted By: martinbguk
Date Posted: 27 May 2011 at 8:22pm
|
Hi Geoff, sorry I missed you on FB. Soapy black bit is correct. 1/2 hard is also the best condition for fabricated bits, but be careful as it can still crack (see black soapy bit above). Half hard is also known as H4 condition (or H14, H24, H34 just to be difficult) 5251 is also know as N4, for sheet material NS4. You also can't tell from this that I own a BIG book on aluminium which I bought about 20 years ago.  ------------- HRSO2 No 59 www.mbg-recumbent-racing.blogspot.com |
Posted By: GeoffBird
Date Posted: 27 May 2011 at 8:25pm
|
Thanks Martin - tricky stuff, Aluminium...
------------- Right Time - Right Place - Wrong Speed |