Lines for hidden parts

[Happy55]

I have a circle on the side view of my picture. I need to show the bottom half of the circle as being hidden behind another part (but the top half is visible).

 

I've drawn the circle, so that's not a problem, I just basically need a way to change the bottom half of the circle to a different line type that represents hidden features, but keep the top half drawn in normal lines.

 

Is this possible, or should I have drawn to semi-circles with different lines.

 

Also, I haven't drawn with different lines yet, so I'll need to know how to change line types.

 

Thanks in advance.

[dbroada]

in plain AutoCAD you will need to draw 2 semi-circles, or BREAK the circle you have twice.

 

To give the "hidden" semicircle a new line type has to be assigned to it. There are many ways but probably the best practice is to create a layer called hidden and move the semicircle to that layer.You need to set that layer's linetype to something suitable and you may have to play with LT scale.

[Lithium]

If I understand what you want to do, here is how I would do it.

 

Draw two circles, one on top of the other. Select the top one and slide it down one unit. Use the Trim command on the first circle to remove the bottom half of the circle. Slide the top circle back up one unit and use the Trim command again to remove the top half.

 

Use the Properties window to change the Linetype from Continuous to Dashed after selecting the part of the circle which needs to be hidden. You may have to set the Linetype Scale to a smaller number to have the dashes appear as dashes and not as a solid line.

 

Maybe the pros here will have better suggestions.

[dbroada]

If I understand what you want to do, here is how I would do it.

 

Draw two circles, one on top of the other. Select the top one and slide it down one unit. Use the Trim command on the first circle to remove the bottom half of the circle. Slide the top circle back up one unit and use the Trim command again to remove the top half.

 

Maybe the pros here will have better suggestions.

I would use the break command - no moving of bits involved

[Lithium]

Dave,

 

Yes, Break would work fine, except Trim seems to me to be more intuitive for a newbie. Break has some nuances that are not very intuitive.

 

(I haven't used Break much in LT 2009. I guess I need to dig into it more as it seems to me LT2000 had more Break variations than LT 2009 does. Always more to learn.)