~~~~HELP~~~~~~~ Trying to design a triang

[johnny916]

I am a very beginner..

I drew a triangle but I can't seem to enter the dimensions I want for because I can't get the dimension arrows pointing towards the end of bottom to top and left to right??

I don't know anything about dimensions can somebody please tell me how to draw or get my dimensions in?





Trying to draw a 200 x 120 triangle with 10 degrees corners.. Using 5.0

 

[dgs]

The orientation of the dimension depends on what you click and where you click the middle button at the end.

If you select a line and a point or vertex, the dimension will be perpendicular to the line to the point. If you select two points or vertexes, the dimension might go in a straight line between the points or it might be vertical or horizontal, depending on where you middle mouse to place the dimension. Line to line will be the distance between them, if they are parallel, or the angle if they aren't. For arcs or circles, double clicking the arc/circle and then middle mouse gives you a diameter, single click a radius.

Some understanding of drafting techniques and geometry rules would help you a lot here.

 

[johnny916]

Doug, thanks! I seem to have been able to create a basic tiangle and I see the dimensions now.. But the problem comes when i create the arc's fillet to round off the corners. Once I do that the dimensions get all screwed up everywhere and I pretty much can no longer resize the triangle as a whole.

 

[johnny916]

Doug, here are the two assignments straight from my book.. I am still on the first one (triangle)because as I follow the steps my scetch does not look like the one from the book!

Anyone else out there who can give some insight as well??


http://jpamaro.com/ads/2assign.pdf

 

[kdem]

You can add points to the sketch that are co-linear with the sides of the triangle and dimension to those.

 

[kdem]

You need a centerline to specify the symmetric constraints. Picking the two arcs on the base will create a tangent dimension. A similar dimension can be created for the vertical dimension.

 

[johnny916]

Ok how do i add those points that are co-linear?

 

[kdem]

Once you have the triangle with the rounds one way to get the points to be co-linear with the lines is to place the points and use the coincident constraint. As you select the point and the lines it should add two bars indicatiing the point and line are coincident. You can also select the point icon and move the cursor over the lines and you will see coicident constraints applied. Once the coincident constraints are shown for the point and both lines place the point. Also check the options under Sketch>Options and select the Constraints tab. Here are some images with the completed sketch and showing what the coincident constraints look like before placing the point.


View attachment 5342


View attachment 5343 View attachment 5344

 

[dgs]

That will work, however if you look at the sketch in his PDF, it's actually dimensioned to the tangent of the corner radii.

 

[kdem]

Idid seethatI justresponded to it inan earlierpost.My pervious post wasin response to his second and fourth posts which didn't have any info as to how the triangle was being dimensioned and he was asking how points can be made colinear to sketch geometry. The post wasn't ment to answer what's shown in the PDF.