Defining start and finish angle in a circular array/pattern

[Dialdrawing]

Hi, We are very new to using any form of CAD package. We are trying to learn how to create circular patterns that are over 270 degrees of the circle. They start point is at 225 degrees and the markings need to be spaced equally round until 135 degrees.

We want to be able to divide up between the start and finish point in various different pattern.

What we are struggling with is how to define the start point at 225 degrees. We are assuming that the end point will come out by the number we put in the pattern to repeat box.

Hope someone can help us. Thank you in advance.

 

[tr1ntx]

There are several ways to do this. A simple one is to draw your first marking at 225 degrees, then do a a circular array over 270 degrees for how ever many markings you need. Standard settings are for 0 degrees to be horizontal to the right from the circular origin, i.e., the 3 o'clock position. Then the angle is measured counterclockwise from that, so 225 degrees will be the middle of the lower left quadrant. I assume you know that, I just wanted to make sure we were on the same page.

Or, to make it easier to draw your marking, you can draw it at 90 degrees, then rotate it couonterclockwise 135 deg, then do the circular array.

I'm using AutoCAD terminology, DraftSight might call it a pattern. I just use the icons: pick on the pattern icon, select circular as the type, then go through the options selecting the object to pattern, the center point, etc.