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- beginner trying to make perfect wire tetrahedron

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7351 Views, 1 Replies

10-31-2002 06:07 AM

Howdy, I'm a beginner using IV4. I'm trying to construct an imaginary

part: a perfect tetrahedron, 200mm on a side, made out of 1mm diameter

wire. Each vertex of the tetrahedron should have three wire edges

coming together at a point.

I can make a triangle no problem:

1. sketch a rough triangle

2. make dimensions d1 and d2 both equal d0

3. return and create a work plane perpindicular to original sketch:

a. select "work plane" tool

b. select one edge of triangle

c. select one vertex of that edge

5. create a sketch on the new work plane

6. "project geometry" the coincident vertex into the sketch

7. create a center-point circle centered on the vertex

8. return and "sweep" the circle around the triangle

I would like, as a next step, to create a work plane at the right

angle to the plane of the triangle, coincident with the center of one

of the lines. Unfortunately, I can't figure out how to do this. The

work plane reference page in help says that to create a work plane at

an angle, I select two parallel faces and enter an angle into an edit

box. But since I don't have two parallel faces, I don't get an edit

box. I've searched for another way to do the edit box, but haven't

found it. I figure there must be a constraint-based way to acheive

the tetrahedron.

I have tried hacking my way to a solution:

1. sweep out triangle as above

2. create a work plane on the interface between the wires at a vertex

by selecting three points around the edge of the vertex interface

3. create a sketch in this work plane

4. project the vertex into the work plane

5. create a center circle with radius equal to the length of an edge

(200mm). This is purely for construction purposes

6. return and repeat steps 2-5 for a different vertex

7. project circle created in step 5 into current sketch

8. draw a point at the intersection

9. return and create a work plane as the combination of the point

from step 8 along with two vertices from the triangle in step 1

10. create a sketch in the new work plane, project the vertices, draw

another pair of edges, return, create a 1mm circular profile and

sweep

11. repeat step 9 with another pair of vertices

12. repeat step 10 in the new work plane

This does make a tetrahedron. The problem is that the vertices of the

last step don't line up! I can't seem to make the work plane

intersect the actual endpoints of the original triangle.

I imagine that I could just put three triangles together with

constraints in an assembly. But it seems like I should be able to

acheive the same goal by just creating a part. Can anyone offer a

simpler way to acheive this goal?

Thanks,

Dave

part: a perfect tetrahedron, 200mm on a side, made out of 1mm diameter

wire. Each vertex of the tetrahedron should have three wire edges

coming together at a point.

I can make a triangle no problem:

1. sketch a rough triangle

2. make dimensions d1 and d2 both equal d0

3. return and create a work plane perpindicular to original sketch:

a. select "work plane" tool

b. select one edge of triangle

c. select one vertex of that edge

5. create a sketch on the new work plane

6. "project geometry" the coincident vertex into the sketch

7. create a center-point circle centered on the vertex

8. return and "sweep" the circle around the triangle

I would like, as a next step, to create a work plane at the right

angle to the plane of the triangle, coincident with the center of one

of the lines. Unfortunately, I can't figure out how to do this. The

work plane reference page in help says that to create a work plane at

an angle, I select two parallel faces and enter an angle into an edit

box. But since I don't have two parallel faces, I don't get an edit

box. I've searched for another way to do the edit box, but haven't

found it. I figure there must be a constraint-based way to acheive

the tetrahedron.

I have tried hacking my way to a solution:

1. sweep out triangle as above

2. create a work plane on the interface between the wires at a vertex

by selecting three points around the edge of the vertex interface

3. create a sketch in this work plane

4. project the vertex into the work plane

5. create a center circle with radius equal to the length of an edge

(200mm). This is purely for construction purposes

6. return and repeat steps 2-5 for a different vertex

7. project circle created in step 5 into current sketch

8. draw a point at the intersection

9. return and create a work plane as the combination of the point

from step 8 along with two vertices from the triangle in step 1

10. create a sketch in the new work plane, project the vertices, draw

another pair of edges, return, create a 1mm circular profile and

sweep

11. repeat step 9 with another pair of vertices

12. repeat step 10 in the new work plane

This does make a tetrahedron. The problem is that the vertices of the

last step don't line up! I can't seem to make the work plane

intersect the actual endpoints of the original triangle.

I imagine that I could just put three triangles together with

constraints in an assembly. But it seems like I should be able to

acheive the same goal by just creating a part. Can anyone offer a

simpler way to acheive this goal?

Thanks,

Dave

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10-31-2002 08:50 PM in reply to:
*dave-gnus

In the sketch that you want it construct a construction line from mid point

to mid point. Change the style in the drop down to construction. STart a

line. hover and move the cursor over one of the sketch lines until the dot

turns green this will be the midpoint. Now attach the other end to the

opposite sketch line. You may have to but a horiz or vert constraint on the

new line. Exit the sketch. Start a workplane and select the construction

line you just made and a plane that is 90 deg to what you want. You should

be able to specify an angle now. Good luck

Kathy Johnson

wrote in message news:m3n0ouw9c6.fsf_-_@bfnet.com...

> Howdy, I'm a beginner using IV4. I'm trying to construct an imaginary

> part: a perfect tetrahedron, 200mm on a side, made out of 1mm diameter

> wire. Each vertex of the tetrahedron should have three wire edges

> coming together at a point.

>

> I can make a triangle no problem:

>

> 1. sketch a rough triangle

> 2. make dimensions d1 and d2 both equal d0

> 3. return and create a work plane perpindicular to original sketch:

> a. select "work plane" tool

> b. select one edge of triangle

> c. select one vertex of that edge

> 5. create a sketch on the new work plane

> 6. "project geometry" the coincident vertex into the sketch

> 7. create a center-point circle centered on the vertex

> 8. return and "sweep" the circle around the triangle

>

> I would like, as a next step, to create a work plane at the right

> angle to the plane of the triangle, coincident with the center of one

> of the lines. Unfortunately, I can't figure out how to do this. The

> work plane reference page in help says that to create a work plane at

> an angle, I select two parallel faces and enter an angle into an edit

> box. But since I don't have two parallel faces, I don't get an edit

> box. I've searched for another way to do the edit box, but haven't

> found it. I figure there must be a constraint-based way to acheive

> the tetrahedron.

>

> I have tried hacking my way to a solution:

>

> 1. sweep out triangle as above

> 2. create a work plane on the interface between the wires at a vertex

> by selecting three points around the edge of the vertex interface

> 3. create a sketch in this work plane

> 4. project the vertex into the work plane

> 5. create a center circle with radius equal to the length of an edge

> (200mm). This is purely for construction purposes

> 6. return and repeat steps 2-5 for a different vertex

> 7. project circle created in step 5 into current sketch

> 8. draw a point at the intersection

> 9. return and create a work plane as the combination of the point

> from step 8 along with two vertices from the triangle in step 1

> 10. create a sketch in the new work plane, project the vertices, draw

> another pair of edges, return, create a 1mm circular profile and

> sweep

> 11. repeat step 9 with another pair of vertices

> 12. repeat step 10 in the new work plane

>

> This does make a tetrahedron. The problem is that the vertices of the

> last step don't line up! I can't seem to make the work plane

> intersect the actual endpoints of the original triangle.

>

> I imagine that I could just put three triangles together with

> constraints in an assembly. But it seems like I should be able to

> acheive the same goal by just creating a part. Can anyone offer a

> simpler way to acheive this goal?

>

> Thanks,

> Dave

to mid point. Change the style in the drop down to construction. STart a

line. hover and move the cursor over one of the sketch lines until the dot

turns green this will be the midpoint. Now attach the other end to the

opposite sketch line. You may have to but a horiz or vert constraint on the

new line. Exit the sketch. Start a workplane and select the construction

line you just made and a plane that is 90 deg to what you want. You should

be able to specify an angle now. Good luck

Kathy Johnson

> Howdy, I'm a beginner using IV4. I'm trying to construct an imaginary

> part: a perfect tetrahedron, 200mm on a side, made out of 1mm diameter

> wire. Each vertex of the tetrahedron should have three wire edges

> coming together at a point.

>

> I can make a triangle no problem:

>

> 1. sketch a rough triangle

> 2. make dimensions d1 and d2 both equal d0

> 3. return and create a work plane perpindicular to original sketch:

> a. select "work plane" tool

> b. select one edge of triangle

> c. select one vertex of that edge

> 5. create a sketch on the new work plane

> 6. "project geometry" the coincident vertex into the sketch

> 7. create a center-point circle centered on the vertex

> 8. return and "sweep" the circle around the triangle

>

> I would like, as a next step, to create a work plane at the right

> angle to the plane of the triangle, coincident with the center of one

> of the lines. Unfortunately, I can't figure out how to do this. The

> work plane reference page in help says that to create a work plane at

> an angle, I select two parallel faces and enter an angle into an edit

> box. But since I don't have two parallel faces, I don't get an edit

> box. I've searched for another way to do the edit box, but haven't

> found it. I figure there must be a constraint-based way to acheive

> the tetrahedron.

>

> I have tried hacking my way to a solution:

>

> 1. sweep out triangle as above

> 2. create a work plane on the interface between the wires at a vertex

> by selecting three points around the edge of the vertex interface

> 3. create a sketch in this work plane

> 4. project the vertex into the work plane

> 5. create a center circle with radius equal to the length of an edge

> (200mm). This is purely for construction purposes

> 6. return and repeat steps 2-5 for a different vertex

> 7. project circle created in step 5 into current sketch

> 8. draw a point at the intersection

> 9. return and create a work plane as the combination of the point

> from step 8 along with two vertices from the triangle in step 1

> 10. create a sketch in the new work plane, project the vertices, draw

> another pair of edges, return, create a 1mm circular profile and

> sweep

> 11. repeat step 9 with another pair of vertices

> 12. repeat step 10 in the new work plane

>

> This does make a tetrahedron. The problem is that the vertices of the

> last step don't line up! I can't seem to make the work plane

> intersect the actual endpoints of the original triangle.

>

> I imagine that I could just put three triangles together with

> constraints in an assembly. But it seems like I should be able to

> acheive the same goal by just creating a part. Can anyone offer a

> simpler way to acheive this goal?

>

> Thanks,

> Dave

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