Cone with angles

Posted on July 17, 2014 by Olivier

Here is the last version of unfolding cones in test.

It should be integrated in ConeDesigner.

The input data:

Height = 200mm
Upper radius = 40mm
Lower radius = 60mm
Upper angle = -20°
Lower angle = 20°
Twist angle = 0° or 90°

The difference is that the -20° angle is twisted about 90° respect to the vertical “welding” joint.

New feature for ConeDesigner

Posted on July 9, 2014 by Olivier

I’m studying the possible modification of the program to add the AngledCone possibility.

Any use ?

Cone Designer Update soon

Posted on March 17, 2014 by Olivier

Users have send feedback on bug in Cone Designer (Thanks Stefan).

I’ve sorted the straight cone unfold formula (mismatch between radius and diameter !!!).

I’ll investigate the approximation in bent cone unfolding which gives diameter errors between sections.

Will post an upgrade as soon as possible.

New version of PipeDesigner

Posted on February 26, 2014 by Olivier

The new PipeDesigner program (2014-02-26) has been released with a export feature to ConeDesigner.

See the tutorial below for detail on getting the data for ConeDesigner.

Example: input data (by default in the GUI) :

Displacement : 124.90cc
Exhaust duration : 193.00°
Exhaust port height : 25.00mm
Exhaust port width : 35.00mm
Cylinder length : 52.00mm
Desired Power: 27.00HP
Engine Rotation : 9800.00 rpm
Coefficient Horn : 1.60

Step 1 => Click on “Compute Pipe” button => Result below

– Blair formulas
– Metal thickness 0.8mm (by default)
D0 : 37.41 mm
D1 : 37.41 mm
D2 : 50.12 mm
D3 : 72.49 mm
D4 : 94.58 mm
D5 : 94.58 mm
D6 : 21.06 mm
D7 : 21.06 mm
L01 : 44.64 mm
L12 : 265.77 mm
L23 : 176.86 mm
L34 : 88.91 mm
L45 : 106.31 mm
L56 : 231.94 mm
L67 : 231.94 mm
Total length : 1146.37 mm

Step 2 => Click the “Pipe Designer” button

– Put these data for the pipe profile for the 8 sections
Arc X : Rayon,Angle
Arc 0 : 44.640000,0.000000
Arc 1 : 253.800000,60.000000
Arc 2 : 176.000000,0.000000
Arc 3 : 88.910000,0.000000
Arc 4 : 36.310000,0.000000
Arc 5 : 35.000000,0.000000
Arc 6 : 35.000000,0.000000
Arc 7 : 950.000000,14.000000
Arc 8 : 950.000000,14.000000
– The following files will be created automatically :
– txt file for the parameters => PipeDesginer.txt
– DXF file for the pipe profile => PipeProfile.dxf

Step 3 => Open the file PipeDesginer.txt and he should contain the following data

You could verify that the diameters in this sample are exactly the same as the ones at step 1 because I pay attention to lengths of the 8 sections of the pipe shape (the cylindrical section has been split in 3 parts!!!)

Arc X : Rayon,Angle,DIn,Dout
Arc 0 : 44.640000,0.000000,37.409979,37.409979
Arc 1 : 253.800000,60.000000,37.409979,50.120635
Arc 2 : 176.000000,0.000000,50.120635,72.383361
Arc 3 : 88.910000,0.000000,72.383361,94.372427
Arc 4 : 36.310000,0.000000,94.372427,94.584018
Arc 5 : 35.000000,0.000000,94.584018,94.584018
Arc 6 : 35.000000,0.000000,94.584018,94.584018
Arc 7 : 950.000000,14.000000,94.584018,21.063705
Arc 8 : 950.000000,14.000000,21.063705,21.063705

DIn = Input diameter of the cone
DOut = Output diameter of the cone

Step 4 => Run ConeDesigner to create the unfold pattern of section Arc1

D2 = DOut = 50.120635mm
D1 = DIn = 37.409979mm
Angle A = Angle =60°
Radius R = Rayon = 253.80mm