Go Back   DIY Go Kart Forum > Building Plans And Advice > Mini Bikes, Trikes, and Choppers

Notices

Closed Thread
 
Thread Tools Display Modes
  #1  
Old 10-13-2006, 01:22 PM
cojaro cojaro is offline
Member
 
Join Date: Aug 2006
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
Default

I know robert's bike was made of 3/4" pipe, but i don't have access to a pipe bender, so tubing is my only way.

My question is, would 1/2" (or 3/4") alum. tubing work, or would it not be strong enough? And if alum. tubing is too weak, is copper tubing any stronger?
  #2  
Old 10-13-2006, 02:40 PM
frank frank is offline
Member
 
Join Date: Jul 2006
Posts: 70
Thanks: 1
Thanked 3 Times in 3 Posts
Default

I think i can bend copper with my hands... and i dont know if alminum can be welded
  #3  
Old 10-13-2006, 05:09 PM
cojaro cojaro is offline
Member
 
Join Date: Aug 2006
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by frank
I think i can bend copper with my hands... and i dont know if alminum can be welded
Alum. can't be welded? I'm pretty sure most metals can be welded.

And yeah, copper and alum tubing is more malleable than steel pipe, but it didn't seem to be so much so that a copper/alum frame would warp.
  #4  
Old 10-13-2006, 05:12 PM
mikeandike mikeandike is offline
Senior Member
 
Join Date: Sep 2006
Posts: 232
Thanks: 2
Thanked 19 Times in 19 Posts
Default

Copper dosnt weld and aluminun deos for sure
  #5  
Old 10-13-2006, 06:32 PM
imported_robertdjung imported_robertdjung is offline
Senior Member
 
Join Date: Jun 2006
Posts: 107
Thanks: 0
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by cojaro
I know robert's bike was made of 3/4" pipe, but i don't have access to a pipe bender, so tubing is my only way.
You mean Alum tubing is the only way (so that you can bend it?)

If you can't find a bender ($70 at harbor freight) then I'd just use square and have a frame that doesn't have any bends. All sharp angles.

To weld aluminum you'll need a mig welder with special gas, and aluminum wire. For that cost, you can buy a bender. OR, find a place that will bend tubing for you cheap.
  #6  
Old 10-13-2006, 07:33 PM
cojaro cojaro is offline
Member
 
Join Date: Aug 2006
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by robertdjung
Quote:
Originally Posted by cojaro
I know robert's bike was made of 3/4" pipe, but i don't have access to a pipe bender, so tubing is my only way.
You mean Alum tubing is the only way (so that you can bend it?)

If you can't find a bender ($70 at harbor freight) then I'd just use square and have a frame that doesn't have any bends. All sharp angles.

To weld aluminum you'll need a mig welder with special gas, and aluminum wire. For that cost, you can buy a bender. OR, find a place that will bend tubing for you cheap.
What about steel conduit? I noticed that to bend those, one only needs the cheap $30-70 manual benders. That seems to be the route as of now
  #7  
Old 10-13-2006, 09:12 PM
jrjulien1 jrjulien1 is offline
Senior Member
 
Join Date: Jul 2006
Location: nova scotia canada
Posts: 206
Thanks: 0
Thanked 0 Times in 0 Posts
Default

i think that aluminum is not a good idea because of the chalanges in welding it {and its expensive} because even if you did get the frame bent up you would still need to weld other things to the frame and as for steel conduit im not sure what that it unless its the correguated stuff which if thats the cast its BUTT UGLY and i wouldnt go that way in my oppinion the cheepest way to go even if it dosent look as clean as round tubing is to do square steel tube and sharp angles and if you wanted to dress it up a little just turn the backbone of the frame and the downtube on edge to make it look a little cooler

ps. copper is NOT very strong and i do not suggest using it to make your frame out of as it would probably break as soon as you sat on it if not then certainly soon after

just my oppinion
  #8  
Old 10-14-2006, 01:44 PM
imported_robertdjung imported_robertdjung is offline
Senior Member
 
Join Date: Jun 2006
Posts: 107
Thanks: 0
Thanked 2 Times in 2 Posts
Default

I would either buy the HF bender for $70 and use pipe, or I'd just not use bends.
  #9  
Old 10-14-2006, 06:28 PM
jrjulien1 jrjulien1 is offline
Senior Member
 
Join Date: Jul 2006
Location: nova scotia canada
Posts: 206
Thanks: 0
Thanked 0 Times in 0 Posts
Default

i agree with robert its just better to use whats allready been tried and tested rather than trying to use things that wernt ment to be put under this kind of strain
  #10  
Old 10-14-2006, 08:03 PM
imported_robertdjung imported_robertdjung is offline
Senior Member
 
Join Date: Jun 2006
Posts: 107
Thanks: 0
Thanked 2 Times in 2 Posts
Default

I've heard that you can use rigid conduit --- but I wouldn't. 30 MPH + metal failure = pain.
  #11  
Old 10-15-2006, 12:13 AM
cojaro cojaro is offline
Member
 
Join Date: Aug 2006
Posts: 49
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by robertdjung
I've heard that you can use rigid conduit --- but I wouldn't. 30 MPH + metal failure = pain.
So I guess I'll go with steel pipe, bending it with the cheap non-hydraulic pipe bender that I can find at Home Depot (the manual kind). I'm going to be using 1/2" pipe since my bike is somewhat smaller, to accomodate my smaller person (5'3").
  #12  
Old 10-15-2006, 06:40 PM
jrjulien1 jrjulien1 is offline
Senior Member
 
Join Date: Jul 2006
Location: nova scotia canada
Posts: 206
Thanks: 0
Thanked 0 Times in 0 Posts
Default

that sounds like a good idea i bet the thing will be very light so you wont have to use a massive engine to go fast
  #13  
Old 10-26-2006, 05:39 AM
seney2 seney2 is offline
Junior Member
 
Join Date: Oct 2006
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Default

HF pipe bender may kink or flatten the pipe... if it does you can cork one end with wood or rubber and fill it with sand. Take a angle grinder or other tool and hold it against the side of the pipe.... this will vibrate the sand tight in the pipe... cork the other end and then bend it....

DO NOT ADD HEAT TO A SAND FILLED PIPE! Sand holds moisture..... moisture + heat = steam which = pressure which = BOOOOM
  #14  
Old 10-26-2006, 09:14 AM
jrjulien1 jrjulien1 is offline
Senior Member
 
Join Date: Jul 2006
Location: nova scotia canada
Posts: 206
Thanks: 0
Thanked 0 Times in 0 Posts
Default

thanks or the tip on not heating the tube it sounds like the kind of thing i would do and not realize its dangerous
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 07:01 PM.