NormandC wrote: ↑Fri Jul 27, 2018 3:27 pm Here's an alternative method that works.

Never think to split an arc to make a point. Good trick, many thanks!

I use the two datum points to create a sketch for sweep, but the result has issue. It cannot fully cut the body.

I found the datum points will change after close and open the drawing, I have to double click on both points to make the position correct, but still the sweep cut is problematic.

Thank you very much, I tried Datum point but failed before, when I see the error I give up, I feel lost in Attachment Mode even after read the document.

Where can I find more tutorial or examples on the Attachment Mode? I tried Google but no luck.

I think my question is not clear enough. I want to have a reference point of the top and bottom of the cylinder edge, so I can draw on XZ plane Front and reference the points on the new sketch.

Edit: I add an image that I want to have a datum line on the cylinder face.

Newbie question, I have a body and want to project two points on a datum plane, but failed. I want to use the side edge as a reference for another body sketch. What is the right way to do that?

Oh I see, I need to set offset. Many Thanks!

I insert an image, than in sketcher I try to draw a circle over the ImagePlane, but the circle not visible. I tried change the transparency of the ImagePlane but not help. I have move the image plane Z up a bit, but I need to draw over the imageplane, how to do that?

Thank you all for help, I can adjust the position of secondary projections now.

How to adjust the size of line and "black dots"? I cannot find the setting in Preferences.

In TechhDraw Workbench, when I open my drawing, the position of Secondary Projections drawing is reset, it seems it didn't save.

Is it the software or my usage issue?

Is it by design with the new version, that every object needs to have it's own sketch? Mirroring inside the sketch was something I've done a lot in my designs. If I try and edit and work on them with v17, they break. Is there a better way to accomplish the same thing? A simple sample is attached. I...