topic Bending a Prism?? in Libraries & objects

Bending a Prism??

JGoode — Thu, 01 Jun 2017 12:12:39 GMT

Hello,

I am trying to make a prism at a 90 degree angle with a radius of 10mm but I have no idea how to script it correctly.

Any help would be appreciated,

Thanks

Re: Bending a Prism??

Barry Kelly — Fri, 02 Jun 2017 01:07:02 GMT

PRISMs just have a height so are in effect straight.

To curve you polygon shape it is probably best to use the REVOLVE command.
This will give you just a curved profile to the specified angle.
You control the smoothness (segmentation) of the curve with the RESOL command before the revolve.

You could also use the TUBE command but it is a little more complicated.
Essentially you have the same polygon but then you give it a path with x, y, z co-ordinates - so it does not have to be a just a curve - it can follow any path.
The more points you set in the path the smoother the curve will be.

The first and last point in the path are dummy points just to establish the angle of the end surface.
The end surface will bisect the angle defined by the first 3 points and the last 3 points in the list.

Barry.

Re: Bending a Prism??

JGoode — Fri, 02 Jun 2017 08:23:18 GMT

Barry wrote:
PRISMs just have a height so are in effect straight.

To curve you polygon shape it is probably best to use the REVOLVE command.
This will give you just a curved profile to the specified angle.
You control the smoothness (segmentation) of the curve with the RESOL command before the revolve.

You could also use the TUBE command but it is a little more complicated.
Essentially you have the same polygon but then you give it a path with x, y, z co-ordinates - so it does not have to be a just a curve - it can follow any path.
The more points you set in the path the smoother the curve will be.

The first and last point in the path are dummy points just to establish the angle of the end surface.
The end surface will bisect the angle defined by the first 3 points and the last 3 points in the list.

Barry.

Hi Barry, thanks for the reply! Do you have any sort of example script?

Thanks

Re: Bending a Prism??

Barry Kelly — Fri, 02 Jun 2017 08:57:22 GMT

Here is a 90° revolve for a 10mm round profile curving with an 80mm radius.

profile_rad = 0.005
revolve_rad = 0.080

REVOLVE 7, 90, 1*0+2*0+4*0+16*1+32*1+64*0,
                profile_rad,       revolve_rad,      1, 
        0,       revolve_rad,    900, 
                   0,          180,   4011+64, 
               -profile_rad,       revolve_rad,      1, 
        0,       revolve_rad,    900, 
                   0,          180,   4011+64, 
                profile_rad,       revolve_rad,     1

I will see what I can find for a TUBE as well.

Barry.

Re: Bending a Prism??

Barry Kelly — Fri, 02 Jun 2017 09:06:22 GMT

Here is a tube.
Can be more than just a simple curve - you define the path for it to follow.
The dummy nodes are marked in red.
The points between are the path.
The first seven co-ordinates are the profile shape (round in this case).

profile_rad = 0.005

TUBE 7, 18, 51,
profile_rad, 0.0, 1,
0, 0.0, 900,
0, 180, 4000,
-profile_rad, 0.0, 1,
0, 0.0, 900,
0, 180, 4000,
profile_rad, 0.0, 1,

-0.1, 0, 0, 0,
0, 0, 0, 0,
0.06367140388221, 0, 0, 0,
0.07133369552651, 0.0005952433182987, 0, 0,
0.07882204397126, 0.002318743681414, 0, 0,
0.0859664547359, 0.005147738336344, 0, 0,
0.09260476324691, 0.009017973839743, 0, 0,
0.1524367191209, 0.05051875591474, 0, 0,
0.1609741469947, 0.05387205483239, 0, 0,
0.1700752270737, 0.05501338288658, 0, 0,
0.1793046684196, 0.05383910007662, 0, 0,
0.1879460033734, 0.05039107776036, 0, 0,
0.1954004986649, 0.04493459948133, 0, 0,
0.2012639732361, 0.03779580958294, 0, 0,
0.2051680634349, 0.02942319141533, 0, 0,
0.2068892434645, 0.02034403381879, 0, 0,
0.2073142210857, 0.01737428732972, 0, 0,
0.2093970665567, 0.003530027058421,0, 0

Barry.