Construction Lines drifiting away from initially selecting point

[Anonymous]

When attempting to create a construction line I usually follow these steps:

1. Select construction line

2. Pick point

3. F8 to toggle ortho if required

At which point the construction line has always rotated about the initial point I selected. Recently however, between step 2 and 3, my construction line does not maintain its initial centre point, it drifts away meaning I then have to use the move command to put it back on the initial point. I can't figure out why this is happening.

Anyone know why this might be happening?

Thanks in advance,

Carl

[ВeekeeCZ]

Check OSNAPs... especially perpendicular.

[TheCADnoob]

are you using snap to grid?

[Anonymous]

BeekeezCZ/ TheCADnoob,

Thanks for replying, I tried your suggestions but still no luck unfortunately.

I have noticed since posting that the problem only occurs when snapping to a point on a block so maybe it's just a case of exploding the block..

Regards

Carl

[TheCADnoob]

This further confuses the issue for me.. would you be able to provide a screen capture of whats happening?

[Anonymous]

Ok,

See attached pdf. As an example, I have a universal beam cross section (block) and a line (shown in magenta)

Line

Fig 1 - I've clicked construction line on the toolbar, then hovered over an endpoint on the line.

Fig 2 - I've clicked the end point and moved my mouse away, notice how the construction line now freely pivots about this point (or if i turn on ortho I could restrain it in the vertical or horizontal, still about the end point selected though.)

Block

Fig 3 - Again, select construction line on the toolbar, this time hovering over a point on the block.

Fig 4 - When I click the point I was hovering over and move my mouse to place the second point of the construction line, the construction line 'detaches' itself from this point.

Regards

Carl

[ВeekeeCZ]

Post this as dwg sample to see why is this block so special.

[TheCADnoob]

are there any contrainghts on the drawing or block? Type in CONSTRAINTBAR

[Anonymous]

BeekeezCZ,

:

I can't upload the CAD file, keep getting the error message

'The attachment's construction lines.dwg content type (application/x-pangaeacadsolutions) does not match its file extension and has been removed.'

However, it appears to be polylines that have the problem, not blocks as I initially thought.

I use the structural CAD sections from http://www.cad-steel.co.uk and assumed they were blocks not polylines.

Cheers

Carl

[Anonymous]

---

@TheCADnoob wrote:

are there any contrainghts on the drawing or block? Type in CONSTRAINTBAR

---

No luck with this command either!

[ВeekeeCZ]

---

@Anonymous wrote:

BeekeezCZ,

:

I can't upload the CAD file, keep getting the error message

'The attachment's construction lines.dwg content type (application/x-pangaeacadsolutions) does not match its file extension and has been removed.'

However, it appears to be polylines that have the problem, not blocks as I initially thought.

I use the structural CAD sections from http://www.cad-steel.co.uk and assumed they were blocks not polylines.

Cheers

Carl

---

ZIP it and post it. Or on some other cloud and post a link.

[john.vellek]

Hi @Anonymous, Please rt-click your drawing file(s) and "Send to" "Compressed Folder". You should then be able to attach the resulting ZIP file to this thread. I look forward to helping you resolve this issue.

[john.vellek]

HI carl.blewitt,

I am checking back to see if you could attach the drawing onto your post so I can take a look.