Unintended Points In A Simple Line Sketch

[bobus17821]

I am getting unintended points when I try to do a simple line sketch - and a huge thanks to John Hackney for pointing that out to me.  But now, being very careful when I do the sketch, I am still getting the untended point.  A few things about the screencast:  when it sounds like I am done, I am - it just took me some fumbling around to get the screencast stopped; and the first line, from the Z axis and going left does have a purpose, although I may not be taking the best, or even a valid, approach.   A future step will be to Revolve the sketch around the Z axis to create a short length of pipe.  So I plan to assign a dimension to that first segment of 1/2 the inside diameter I want the pipe to have.  What I am hoping will happen is that dimensioning that first segment will position the sketch so that the pipe resulting from the revolve will have the correct dimension.  

I am sure that this is a stupid mistake on my part, so I will apologize now.  But I don't think I can get past this problem without some help.  Thanks,  Bob 

[bobus17821]

I think I am doing the right things to get the screencast attached to my post, but when I click on "Insert" I get this message "Your post has been changed because invalid HTML was found in the message body. The invalid HTML has been removed. Please review the message and submit the message when you are satisfied." I didn't put any html in my message!

[TheCADWhisperer]

Inserting Screencast has been broken for years. 
Post a direct link instead.

[davebYYPCU · Accepted solution]

Draw the centre line.  Use the pipe tool.

Might help....

[HughesTooling · Accepted solution]

I've inserted your screencast below. Think you have another thread about this, not sure if you got an answer in that thread. 

Why are you clicking three times when you create the first line? Fusion will create a new section each time you click, it doesn't know you don't want 2 collinear lines. You just need to pick the start and end, not a point between as you are here.

Mark

[bobus17821]

Thanks for making me aware of the pipe tool.  I'll look into it.  However, the part I am trying to make has to snap in place around a metal rod.  So it can't enclose the rod.  With revolve I can specify and angle and without a little give in the material be able have a part which will snap in place on a rod.  Thanks again,  Bob

[HughesTooling]

@bobus17821 If you just want to revolve a profile, just draw the closed profile away from the centre line and dimension that distance. There's no need for your first segment.

Also if you draw a vertical line from the origin with the centre line option checked you can add diameter dimensions rather than radial.

You can make the bottom line align with the origin if you add a coincident constraint between the line and the origin.

Mark

[bobus17821]

Thank you very much Mark.  I did have an earlier (and less precise) thread.  What I knew then was just that I couldn't select the line segment I wanted to dimension.  John Hackney told me that I had a point on the line which wasn't letting me select the segment of line which I wanted to select to assign a dimension.  But I could not see where that point was coming from.  I think I understand now.  My subconscious was thinking, correctly, that altogether I needed three points on the bottom horizontal line.  But then, when I drew the second long vertical line from the top back down to the bottom horizontal line, I was not connecting to the point I had already defined.  I now know that if I fish along that bottom horizontal line I can find that previously defined point (the cursor changes to an "x") and use it.  Then I would have needed to use a parallel constraint to insure that the two sides are parallel.  I don't know if my subconscious had gotten that far.  

So ... now, thanks to John Hackney and you, I am clear on what I am doing wrong and how to correctly do the sketch I need.  So thanks very much to you both.  

Bob