Compound Angles

[brainbug007]

I'm at the stage with my bike carb manifold where I need to cut the tubes to connect the two plates and could do with some advice or simple to follow guide about how work out & cut the compound angles of the tubes.

[Ashtonr]

I spent about two weeks trying to work this out and cut up about 2 meters of tube before giving up. I would suggest you cut the angles which are paralel leaving enough material to file the second angle, the actual filing doesnt take that long in the end. Have a look at my perious post i think there were some pictures of what i did in the end

[mark]

Originally Posted by brainbug007

I'm at the stage with my bike carb manifold where I need to cut the tubes to connect the two plates and could do with some advice or simple to follow guide about how work out & cut the compound angles of the tubes.

make a jig to hold the two plates in their final positions and just keep fettling the tubes to suit, simple but takes a while

[Bonzo]

Here is a link to the Jig that Dave Murray used to mock up his inlet manifold.

Manifold Jig

An ideal way to fettle the angles to the right profile

The Jig also came in well handy to keep it all in place so as it could be tacked up with the tig welder

[brainbug007]

Cool thanks for the suggestions guys. I'll have to check that link later when I get home bonzo, can't look at facebook at work I did come across this http://www.tamarisktechnicals.com/pages/roadster.html where he talks about cutting the compound angles for the chassis but I couldn't visualize what he means about how to clamp it up in the vice and then cut it? I've only go a grinder and hacksaw so not sure if his method would work for me anyhow.

[Bonzo]

No need to wait till you get home

Here's the picy



Use the wooden blocks to set the manifold plate flat, set the angle of the dangle & correct tube spacing.

Once you have the jig made up, thread each tube through & mark a rough first cut ( Pencil or marker will be ideal )

When the first rough cut has been made, feed the tubes through and you should be able to mark a more exact cut line.

second cut made it will then be easy to fettle to a nice fush joint with a file

Finaly cut each runner to the desired length, this method is not too wastefull on matterial, a locost & easy diy method.

Light the Blue touch paper & weld it all up, jobs a good'un.

David, sorry I nicked your photo mate

[brainbug007]

Nice one thanks bonzo, that should be alot easier as trying to mark angles to cut is a nightmare on round tube as is and this looks like it'll be much easier that way