What the hell is he building in there II

[Dave Kirk]

I'd been sharing photos of this project over the past few weeks in the general discussion forum and thought I'd break in the new gallery with the finished photos.

It's been really fun making and sharing this. It was finished a few days ago and it's now on it's way to JB to be painted a wonderful sunset orange.

Hey...... thank for looking.

Dave

[zank]

that is beyond cool. You single handedly kept the gasflux company in business with all that brass. :biggrin:

[jimi]

That's close up shot of the headtube is seXXXy. Nice...

jimi

[dave1215]

dave,

that there is a lot of geometry - you gotta be a math whiz?

dave

[Too Tall]

I wish you were avail. when we were racing tandem. The tubing and design are spot on than again what else could we expect from you? Paint? Wheels? SRAM?

[Dave Kirk]

I wish you were avail. when we were racing tandem. The tubing and design are spot on than again what else could we expect from you? Paint? Wheels? SRAM?

The owner will be building it up and I'm not sure of what he will be using. I do know it will have Avid disc brakes. It is designed to allow the use of a Gates belt as a synchronizer but he may start off with a good ol' fashioned chain.

DT tandem hubs laced into something stout.

Beyond that I don't know.

I am looking forward to seeing it all built up and on the road.

Dave

[pdxmech13]

Dave, how many hours did you put into that frame ?

[Too Tall]

Nice, I use the DT hubs also they are perfection. I've put a campy freehub body onto it despite their (aheem) warning...not a problem. I wanted to be different and run campy record on our tandem ;)

See? I'm not fickle!

[SeanEasley]

what gets me is how those filets are filed out proportionally to the different angles of the tubes that join.

I'd wager Dave is the best out there when it comes to filets...except I think someone already said that.

[Dave Kirk]

Dave, how many hours did you put into that frame ?

You know I'm not sure. I'd guess somewhere in the 35 hours of bench time or so.

It was fun work.

dave

[Dave Kirk]

what gets me is how those filets are filed out proportionally to the different angles of the tubes that join.

At the risk of sounding woopiewoopiewoopiewoopiey it's not that the fillets were filed in such a way to make them centered like that - it's that they were laid that way to start with. It's stupid hard to lay the fillets off center and then try to make them look centered with finish work. Ironically it's much easier to use the heat so the fillet ends up in the middle of the crotch.

This photo is of the ass end of that same bike showing the fillets before any finish work. It's not a very good photo but you can se that things are centered. In the end going slow with the torch and getting it as good as you can will save much more time down the line.

Thanks for the kind words and for noticing. One puts a lot of effort in on stuff like this and it's cool that others can sometimes see it.

Stay warm (stupid cold here today),

dave

[gomez308]

Dave,

Do you have to adjust the angle of the dangle to get gravity to help you out? Or do you work with the bike pretty much stationary?

Strong work.

[Dave Kirk]

Dave,

Do you have to adjust the angle of the dangle to get gravity to help you out? Or do you work with the bike pretty much stationary?

Strong work.

I do position the work so gravity helps the filler material settle into the right spot if possible, but it often isn't possible. In this case, where you are hanging the fillet, you need to be very very careful with the heat to get the brass to puddle where you want it to.

When you fillet braze a normal single frame it's pretty simple as the bike is small and easy to flip around in your work stand to get the best angle and access. A tandem is a different story and in my shop it nearly hits the ceiling when I spin it around in the workstand.

Dave

[swoop]

oh my.. i just realized that thing is going to take a grip of paint! how many linear feet of tubing did it take to make it?

[Jason Musgrave]

There ain't many cats who can lay down a fillet like that...

[endo shi]

Beauty!

Any reason why the front coupler placement is behind the captain ST and not in front?

[Dave Kirk]

Beauty!

Any reason why the front coupler placement is behind the captain ST and not in front?

Just for the simplicity of packing. The front top tube on this frame is short enough that it will fit into a standard S&S case without breaking the front triangle in two. If it was even a few cm longer I would have put one set in from the the front seat tube and then the second set in the rear.

If the bike can be designed with both sets in the middle then you take out those three tubes and they are very easy to pack and you only have two solid structures to pack (Front triangle and rear triangle) instead of three.

Does that make sense? It's very cold here and I'm not sure I'm making much sense.

dave

[endo shi]

I get it, makes sense. thanks for the explanation.

Just for the simplicity of packing. The front top tube on this frame is short enough that it will fit into a standard S&S case without breaking the front triangle in two. If it was even a few cm longer I would have put one set in from the the front seat tube and then the second set in the rear.

If the bike can be designed with both sets in the middle then you take out those three tubes and they are very easy to pack and you only have two solid structures to pack (Front triangle and rear triangle) instead of three.

Does that make sense? It's very cold here and I'm not sure I'm making much sense.

dave