Pay it forward.

[Shield Arc]

A friend of my wife ask me if I would help her son-n-law with a project. He is in his senior year to be a mechanical engineer. This is his senior year project. Make a collapsible bicycle frame out of aluminum pipe. This is all we got done so far. Personally I don't think it will telescope in with out pivot points. But who am I? I can't even spell engineer.

 

[davesl708]

I agree. The front top bar and bottom angle bar have no place to go unless disassembled. I hope that is aircraft grade tubing. There are eight load points on that frame not counting the telescoping sections.

Good luck.

Nice welding by the way. That part looks good.

 

[bcp]

A triangle with rigid angles will telescope using 3 sides at the same time. Just 2 sides telescoping won't work. The 3rd side has to get shorter, too.

Bruce

 

[Shield Arc]

He has made a few miscalculation so far. He said the first cope he made by hand took him 45-minutes. I showed him how to do it with a hole saw. He about fell over! :laughing:

 

[bcp]

Things would be much easier if more engineers got involved with the construction or maintenance of what they design.

Bruce

 

[Shield Arc]

I get the biggest kick out of these kids. Things we take for granted, they think is the coolest thing ever.:laughing:
This kid has no idea how to hands on build anything.

 

[aczlan]

A triangle with rigid angles will telescope using 3 sides at the same time. Just 2 sides telescoping won't work. The 3rd side has to get shorter, too.

Looks like that is being done for the front triangle, the seatpost and the other two bars all telescope...

Aaron Z

 

[davesl708]

Looks like that is being done for the front triangle, the seatpost and the other two bars all telescope...

Aaron Z

That is correct but there needs to be two pivot point at the front fork tube for this design to work. Top and bottom tubes will need to pivot.

 

[bcp]

There are many versions of a logo with a 3 gear train symbolizing working together, etc. I'm hoping it is an artist's goof, not an engineer's.



Bruce

 

[Shield Arc]

That is correct but there needs to be two pivot point at the front fork tube for this design to work. Top and bottom tubes will need to pivot.

That's the way I see it too. But I'm just a rigger, sometimes weldor.