Compound Angles
 

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.

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

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

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 :)

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.

No need to wait till you get home :D

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 :D

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 :)