Pie cutting

[Imback]

Absolutely nothing, IMO. Looks just fine to me. Some people are just really picky.

There's nothing wrong with using straight pipe to pie cut. Overly picky people can simply use smaller angles and more sections when using straight pipe.

Or you can just pie cut a bend and get a smoother and tighter radius.

 

[99gst_racer]

Or you can just pie cut a bend and get a smoother and tighter radius.

I agree. But that doesn't mean straight pipe cuts suck. The pic you posted is actually pretty nice looking IMO.

 

[floader]

I think that pie cutting has its place. But if you can buy a mandrel bend that fits, IMO it looks/works better. One example is the 3" V-band down pipes. You can pie cut the heck out of a something or you a buy the ATP 120 mandrel bend and get a nice clean look. Takes way less time too
http://www.atpturbo.com/mm5/merchant.mvc?Screen=PROD&Product_Code=ATP-STL-025&Category_Code=PPB

 

[T is for TURBO]

Is that an LSX in an E36?

I don't know what you need more of: Patience, or skill!? That intake pipe is a beautiful peice of work.

 

[Meshuggah]

Is that an LSX in an E36?

I don't know what you need more of: Patience, or skill!? That intake pipe is a beautiful peice of work.

It is indeed both a LSX in an E36, and a beautiful piece of work.

 

[91stocker]

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Love me some pie.. cuts

Now thats just showing off, completely unnecessary

 

[knochgoon24]

I still like the idea of a 4g63 in an E36.

 

[T is for TURBO]

I still like the idea of a 4g63 in an E36.

Me too, however, I think my father would disown me if I ever suggested it.

I know it's been done to an E30...

 

[Gamble97]

And off topic we went.

Back on topic please.

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So in this pic are all the cuts near the blue and red lines at the same angle? Or is only one side of each pie piece cut at an angle and the other is straight cut?

BTW my chop saw sucks a fat one. I need something else to practice this with.

 

[Gamble97]

Got the horizontal bandsaw setup and set the guide to 10* and cut a piece of 1.5" mild steel.
Then set the pipe back to 0* cut it again, then back to 10*. (ah crap maybe it was 15*, i don't remember)
Anyway it's not coming out how I want it to.

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[knochgoon24]

For a constant radius, all the cuts are done at the same angle, but rotate the pipe 180° each time. Then you won't have to reset your guide, and if you setup a stop, they'll all be the same length, too.


So cut pipe to 15°, rotate 180°, cut, rotate, cut, etc. For the constant radius, you shouldn't have to touch the guide. This is why Paul mentioned drawing lines 180° apart on the pipe.


But to really get a good result, you need to do a little math. That's why Brian was talking about the pie cut calculator.

 

[Gamble97]

Hmm, I'll try that and report back.

 

[turboglenn]

GAmble, go back and read my poston page one.. set yuour guide to 7.5*,makemarks on the pipe so you can rotate it 180* backand forth consistantly, then just go at it.. you don't want to have straight cutson one end of your piepieces you want the same angle on bothe nds for the best looking smoothest transition. I'll find some pics of somesmallcuts I've made and weldedup that are still laying around

 

[tkelly27]

It looks weird because of the straight cuts and non-consistant lengths of cuts. If you had a stop you could run the end of the tube into repeatably, and a way to flip it 180 degrees, it would be coming out much nicer. The length consistancy won't play as big a part in making it turn nicely, but it will keep it more uniform in the bend. The flat sections meeting each other are making long sections without turning.

 

[Gamble97]

Check this out
CAR LIFE>> CREATING A TOMEI PROTOTYPE - Speedhunters

 

[99gst_racer]

This is a pretty sweet fixture. I wonder where a guy can find those clamps?

I like how they have a section that simulates the chassis so they know clearances away from the vehicle. I plan to do the same thing to simulate my radiator on my car for my next compound build.

 

[Gamble97]

I think they are these?
500 Lb. Vertical Toggle Clamp
Toggle Clamp - 500 Lb. Horizontal Toggle Clamp

I was going to order them but I'll just go pick them up when I'm free.

 

[99gst_racer]

Those are similar. But the ones in the pic aren't used for clamping something down like the HF ones. They're used for outward positioning.

 

[____Kurt____]

I'm trying to get some cutting done for my DP and it seems like I can't get a good straight cut through a piece of mandrel bent exhaust. I am using a brand new dewalt chop saw and abrasive blade and I have noticed that at ending part of the cut the blade likes to flex outword giving a non square cut. But after using an angle grinder to square the end up , the pipe is still not butting up to a squared piece evenly, as if the angle I cut is wrong. I tried using a thin ziptie to get a trueline and hoseclamp. But they didnt follow the sameline. Can someone please shoot some pointers how to get a correct cut throgh a bend?

 

[99gst_racer]

I always run the cuts on a belt sander (with a really coarse belt) to get the cut even and square.

 

[____Kurt____]

Here is what I keep experiencing. The 2 surfaces just are mis-aligned. Since I dont have a belt sander or a dick grinder I had to improvise. I bolted down a 4.5" angle grinder and use that to true the end of the pipe. Im sure it isn't OSHA approved but it works for now.
In the top picture is I took a hose clamp and tightened it down and marked the top side, then moved it up and marked the bottom side. I then split the difference and tried to cut in the middle of the 2 lines.

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