Pro Fabrications - Pfre - Fabrication

[Nee-san]

Technical question Brad.

How do you cut profiles into the tube for fabrication ?

[Risking]

Profiles in which type of fab work?

The cages or the merge collectors for the exhaust system.

The exhaust stuff is a lot of work, the first of the merge collector is honestly a lot of educated guessing and measuring.

Once you've got the first collector close a cardboard template that can be wrapped around the tube is used to replicate it.

Im actually running some basic fabrication tutorial days in the coming months for various clubs

[Nee-san]

I meant scalloping the cages etc, I'm thinking about doing my own manifold and half cage weighing up whether to do it by hand or pay and get the tubes profiled at work. (I ain't no master fabricator )

[Risking]

The actual knotching is the easy part, I use a speed werx tube knotcher that uses holesaws

It's calculating the knotch which is the difficult part.

Basically

String line the bar you want to do

Cut the length longer than the inside measurement

Measure the angle your spring line makes with the bar you want to connect it to. I use a sliding bevel for this

You will need to also mark the center line of the tube you want to knotch.

Transfer the angle into the knotcher and make the cut

To do the other end you need to sit the tube in the cage, mark the total length where you want the knotch to begin and repeat the process.

You can't just profile cut the ends and hope they are right. Each tube needs to be calculated and done to suit its location. As much as you'd like to think its symmetrical its never perfect.

You would still need to work out angles, centrelines, distance etc then get each bar profiled as you go so it would take along time.

[Nee-san]

Shit, I don't have a holesaw jig either.

Ever thought about getting them lasercut ?

Think I'm just going to pay and get them done

[Risking]

Can't laser cut them untill each bar has been orientated in the car to find the center line (knotch center lines are usually slightly different at each end too) then you still need to string it up to find the angle and length.

I know people who have tried getting them laser cut but they end up scrapping a lot of material and buying a knotcher.

There is 18 junctions in a basic 6 point cage. Getting all of those measured to have tube laser cut in one go is impossible as one bar often effects the next.

There are companies overseas which supply cage kits pre cut and knotched but everyone I've seen being fitted has required work on the joints to make it right still.

[JadeGTR]

very nice toys

[MBS206]

The actual knotching is the easy part, I use a speed werx tube knotcher that uses holesaws

It's calculating the knotch which is the difficult part.

Basically

String line the bar you want to do

Cut the length longer than the inside measurement

Measure the angle your spring line makes with the bar you want to connect it to. I use a sliding bevel for this

You will need to also mark the center line of the tube you want to knotch.

Transfer the angle into the knotcher and make the cut

To do the other end you need to sit the tube in the cage, mark the total length where you want the knotch to begin and repeat the process.

You can't just profile cut the ends and hope they are right. Each tube needs to be calculated and done to suit its location. As much as you'd like to think its symmetrical its never perfect.

You would still need to work out angles, centrelines, distance etc then get each bar profiled as you go so it would take along time.

What Brad really means here, is save yourself a LOT of head ache and work, and pay someone to built the whole cage.

I've watched Brad do it before, and I'm all for giving stuff a go myself... But bugger that idea!

As for manifolds, I'm going to be building some for myself soon too, I've watched a manifold builder work, and it's worth a crack yourself if you're handy with some metal work gear. As for doing manifold building as a job... Yeah... No thanks! LOL

[R32GOJIRA]

Sent you a PM last week regarding this. My wheels are on their way and would like to see what options i have

Been done before and have the CAD drawings to prove it

There is two ways to do the conversion one is rather expensive but far superior the other is cheaper, works fine but isn't doing anything for the suspension geometry.

[JadeGTR]

i know this is an old post, but any chance that you still have it on the shelf?

thanks

Not a problem I'll cancel the invoice.

If anyone wants an R33 undercar surge tank setup for twin 044's I've got one fabbed and ready to pressure test/ post off.

$330 inc gst plus postage charges.

[Risking]

That one was sold.

However I received your email and will send a replys out today to all.

[JadeGTR]

[R32GOJIRA]

Awesome!

My wheels are currently in Perth clearing customs.

So wont be long until they arrive on my doorstep and ill need a bit of help getting them to fit the right way

[Risking]

Lotus pipes

[R32GOJIRA]

Lotus pipes

image.jpg

Holly shite!!!! Spaghetti much?

With skills like that your shop should be called SPC Fabrication

[Risking]

[Roy]

What the f'n fark man!I badly want a Lotus Elise/Exige...pics of those pipes make me want one with loud, buzt pipes as well!

[Risking]

Looks like we are sending a set the same as these over to the UK.

There has been some massive interest in them from the other side of the world where lotus' are massive.

[Roy]

Do you have any VT touring cars that you have access to? I have a VT Supercar wing that I am mounting up to my bus and interesting to know the range of rake they ran on the VTs so I can make up for the differences in boot angles.

[Risking]

Yes I do have one VT and a VX.

Do you want to know the actual angle it's set on?

I have a set of the harrop billet mounts that were used on a lot of the cars at that time if you need mounts for it too