Bending copper/nickle 3/8" fuel line

[Weld ON]

If that coper then you need to know two things ( my dad was doing airco for 32y) , you have 2 basic types , we can call soft tube DVP1-Cu and they can be bended easy even with hands most of time for fridge repair,car etc and then you have .. we calling ''hardened'' tube DNP-Cu and they need big radius and they are used for straight long line. Good bender is not making tube flat and pushing side inside to prevent of flat spot. About sand : try and im sure that you will snap tube , you need to know exactly how much of sand you can fill inside. We bending with pre-heating , 2x end cap with low pressure 1-4.5 psi .

Rolled Products - CU KER Kft.

Rolled Products - CU KER Kft.

cu-ker.hu

The Different Types of Copper Tubing - Metal Forming Solutions

Learn about the different types of copper tubing: Type L, Type K, Type M, DMV pipes and more. Learn from industry leader Metal Forming Solutions.

metalformingsolutions.com

i hope that helps..

 

[sdelivery]

One thing that really helps is putting the stationary arm in a vice.....

 

[sdelivery]

No flattening......

 

[Weld ON]

That is profi cast iron bender evrything is closed with small gaps no space like i said above pushing side inside and that is prevention for flat spot ... lov it .. i guess that is old bender

 

[sdelivery]

That is a Robinair brand tube bender made out of fiberglass I believe.....
It is from the last century. lol
Damn I am feeling old.
There are still metal ones made but they are for one size tube where this one does five different sizes.
Funny this was about 30.00 new at the time the metal ones were about 120.00 each.....

 

[pdentrem]

I remember those Robinair tools. Well made

 

[Shootymacshootface]

I have had great luck with that stuff bending it by hand. Or gently wrapping it around something of the correct diameter. Although, it does flatten out a bit. Maybe you could turn something up on a lathe with the correct size groove and radius on it? That would keep it from flattening out. One piece of aluminum with several radius sizes and now you have a new bending tool.

 

[brino]

That is a Robinair brand tube bender made out of fiberglass I believe.....
It is from the last century. lol
Damn I am feeling old.
There are still metal ones made but they are for one size tube where this one does five different sizes.
Funny this was about 30.00 new at the time the metal ones were about 120.00 each.....

Wow, I never would have though about a fibreglass tool for that.

However, reading the model number off yours (Robinair 14528) led me here:
https://www.toolsource.com/tubing-b...e-tubing-bender-supersedes-14528-p-94289.html

only $25 for 3/16", 1/4", 5/16", and 3/8" tubing.

I may have to find myself one.

Thanks for posting!

-brino

 

[GoceKU]

i've had good luck heating the line up and cooling it down with water, that makes it softer where it needs to bend also i've always used just a big socket or anything round and rolled it across with my hands.

 

[guero_gordo]

For brass instrument repairs, one trick is to fill it with a glycerine water solution, then freeze it. The factories do the same thing but with tar inside, then they rinse that out with solvent. Either way, they will also tap a steel ball on a rod/cable through afterwards if it's noticeably out of round.