ORBO Le Klunker de Acatène

[BartRidesEternal]

So I decided to enter the ORBO competition this year.
I already started on the frame a while ago. Its my learning project: Learning to: Braze, Mitre/Notch, Use my alignment jig, Roll tubes and Bend tubes.

The project is standing still due to lack of a base for the bending machine or tool.

I ordered a 'post' or stand to work in my shack and with a good working height, so I won't hurt my back and the tubes have good clearance for swinging.
The first post I got from a shop was terrible. Very thin wall thickness and couldn't handle the torque + force.
I sent that one back and I designed one myself.

Long story short: When this post is done and ready to anchor to the floor, I can start bending the CrMoly chainstays and seatstays.


The bike's general direction:

First sketch!

Headtube, bottom bracket, seat tube brazed together and the shaft is temporarily assembled.

Current state. Top tube nearly ready to braze. I want to braze the top tube and chain/seatstays in one go.

Lots of work to do!

I'm planning on 26" wheels. Tires won't be super fat due to the shaft limiting tire clearance.
Ratio 2:1 (like a 44t - 22t regular chain driven bicycle).
A nexus 3 hub will work fine or a single speed.


Link to original topic on Ratrodbikes forum

Name inspiration historic bicycle link

Translation of Acatene:

Adjective​

acatène (plural acatènes)

1. chainless

 

[ChaOs]

That's awesome. I can't wait to see the bike!

 

[Pondo]

Great concept drawing. This is a fun build, keep it going.

 

[twojs.bike]

This is ambitious and I am very interested.

 

[Robertk]

Can't wait to see this awesome creation!

 

[metalchewy]

View attachment 286592

So I decided to enter the ORBO competition this year.
I already started on the frame a while ago. Its my learning project: Learning to: Braze, Mitre/Notch, Use my alignment jig, Roll tubes and Bend tubes.

The project is standing still due to lack of a base for the bending machine or tool.

I ordered a 'post' or stand to work in my shack and with a good working height, so I won't hurt my back and the tubes have good clearance for swinging.
The first post I got from a shop was terrible. Very thin wall thickness and couldn't handle the torque + force.
I sent that one back and I designed one myself.
View attachment 286593
Long story short: When this post is done and ready to anchor to the floor, I can start bending the CrMoly chainstays and seatstays.


The bike's general direction:

View attachment 286594
First sketch!

View attachment 286595
Headtube, bottom bracket, seat tube brazed together and the shaft is temporarily assembled.

View attachment 286596
Current state. Top tube nearly ready to braze. I want to braze the top tube and chain/seatstays in one go.

Lots of work to do!

I'm planning on 26" wheels. Tires won't be super fat due to the shaft limiting tire clearance.
Ratio 2:1 (like a 44t - 22t regular chain driven bicycle).
A nexus 3 hub will work fine or a single speed.


Link to original topic on Ratrodbikes forum

Loving the looks of that. And a unique shat drive to boot. So awesome .

Curious who you bought the frame tooling from. That is a great setup.

 

[BartRidesEternal]

Loving the looks of that. And a unique shat drive to boot. So awesome .

Curious who you bought the frame tooling from. That is a great setup.

Thanks guys!

@metalchewy in the 'build from scratch' section, I have a topic dedicated to my tooling. Topic "Build a welding JIG first"

In regards to the tooling:

Almost ready to weld the bending tool 'post' or 'base'. After that I can bend the chainstays and seatstays.

10mm S355 plate. Tube is 102mm round.

Extra rigidity.

Top plate with the 8mm holes for the bending tool.

I could add more strength to the base.
I can also add a handle somewhere on the top.

I can always change things up later.

Currently I have exactly the same tool as the youtube video below. Next best tool according to my market research is 8x more expensive. This seems to do the job for me.
That guy said he is bending 25mm diameter, 1.65mm thick stainless steel. The forces are pretty immense!

 

[Pondo]

Topic "Build a welding JIG first"

I still need to catch up on that thread, very good stuff. I'm going to build my own someday but at this rate it might not be until I retire.

 

[BartRidesEternal]

I still need to catch up on that thread, very good stuff. I'm going to build my own someday but at this rate it might not be until I retire.

When you have a jig, you want the rest too (tube notcher, benders etcetera)
In my workspace of 2 meters by 3 meters, I have to be smart with the space and machines.

I finished the post or base for the bender today! I drilled some holes in the ground for female threaded anchors.

I hope that, with large diameter tubing, the large stones will stay put!

Lets weld thiss.

Cleaned and preheated all parts.

Hello!

Bender base and shaft fit perfectly!

A lot of work for something that looks so simple.
I can start bending this weekend, nice!

 

[metalchewy]

I have the bender. I have some Swag diamond rollers and some swag extenders.

The jig I tried to make didn't turn out as well as I liked. Will look into making a jig similar to yours as soon as I get the chance todo so.

Such cool and impressive work!!!