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-   -   Just finished homebuilt recumbent (http://www.bikeforums.net/recumbent/63010-just-finished-homebuilt-recumbent.html)

tiggeraaron 08-23-04 11:19 AM

Just finished homebuilt recumbent
 
Just recently finished a LWB recumbent. The frame, seat and handlebars are all completely built and tig welded from raw materials. I can't take credit for some of the design, the frame design came from a LWB being sold on eBay and the seat design is like a Rans seat. The handlebars are my design though. The components are from a donor Specialized Hard Rock MTB that I got at a second hand store for $30.00. I doubt that I have over $150.00 total in this bike. Fun to ride and fairly stable with the rake at 70 degrees and about 3" of trail. Fairly manuverable too, for a LWB, as I can take a 180 degree turn in a standard street width. Check it out below and let me know what you think! Click on the link and go to the recumbent bike link.
Recumbent Bike

royalflash 08-23-04 03:23 PM

sounds interesting but couldnīt get the link to work-too much traffic or something- I have been looking at the recycled recumbent site

http://www.recycledrecumbent.com/

I am thinking of building a frame of some sort - why did you choose tig welding instead of brazing?

tiggeraaron 08-24-04 11:20 AM

Yeah, too much data transfer and they shut you down! Its free so I won't complain too much. I chose tig over all other joining methods because I am better at tig than anything else. I know tig is supposed to be the hardest welding method to learn but I found it surprisingly easy. Besides, I just like the look of a good tig bead. If you are planning on building a frame from scratch remeber to triangluate the frame to keep all member in compression/tension. I should have angled the seat tube towards the front instead of angling it back like the front derailer tube. I am doing that on my next recumbent.

funbun 08-24-04 12:17 PM

Where did your learn how to weld? I'd like to put together a Greenspeed GTE. Did you have to buy the equipment or did you rent it?

bentbaggerlen 08-24-04 03:58 PM

Nice bike, But that shop is much too neat! Your frame jig is nice as well, thats not going to pull when you start welding.

tiggeraaron 08-25-04 10:50 AM

I actually learned to weld on my own and I own all my equipment. As pricey as it all was, you just can't skimp on tools. They can literally make or break a project. I practiced o/a, mig, stick and tig for a year before even thinking of getting started with a large project like a bike. As far as the shop being too clean, you should have seen it before I took the picture, what a mess! I have to stop every now and then to clean, I keep tripping over all the tools and materials. Thanks for all the compliments too! I am in the process of starting another recumbent. With this project I am thinking of taking more detailed pics and explanations of the process this time. Would anyone here benefit from such a tutorial? Just a thought. Thanks again!

funbun 08-25-04 10:59 AM

Wow, that is a good job. What's the difference between MIG and TIG welding. Which is better for bikes?

royalflash 08-25-04 11:01 AM

I would be very interested to see what you have done and how you did it. I am going to sign up for a college metalwork evening class which covers brazing and welding and would like to start making some bike frames on an amateur basis.

funbun 08-25-04 11:13 AM

Me, too. I love Greenspeed but they just cost too much. I'd love to build my own to save cash.

Here is a link a framebuilders forum. It's in email format. It would be better if they switched to Phpbb.

http://www.phred.org/mailman/listinfo/framebuilders

funbun 08-25-04 11:26 AM

Quote:

I am going to sign up for a college metalwork evening class
That is probably a cost effective way to go. Greenspeeds cost $4,000 tp $6,000+. I could learn to weld and build as I see fit.

tiggeraaron 08-25-04 11:37 AM

Mig and Tig difference, that is a huge subject that probably won't fit here. A good article on the difference can be found here. Also, search google groups, there are tons of explanations there as well. You can use mig, tig, o/a(weld or braze) and stick welding to join frames. You are only limited as to your skill with whatever process you choose. As a guideline though, tig is preferred as it is neater, better controlled and there is hardly any post-weld cleanup to do. Generally, when someone new approaches me on the what is the best way to get started, I rarely ever say mig. Because IMHO, o/a or stick is better to start with for the simple fact that you have to concentrate on puddle manipulation to make the weld. Mig can sometimes be too automatic and quick. You might not catch mistakes with mig as well as any of the other processes. A crappy looking weld made with o/a, tig or stick is going to be a crappy weld. Where as a good looking mig weld might be a crappy weld underneath. So in that be careful and test your welds often.

Ritz 08-29-04 04:29 PM

SWEET!!! Nice moulding job under the seat too.


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