AutoCAD 2010/2011/2012

AutoCAD 2010/2011/2012

Distinguished Contributor
Posts: 192
Registered: ‎09-26-2008
Message 1 of 2 (172 Views)

not understanding constraints in blocks

172 Views, 1 Replies
01-09-2013 11:36 AM

I'm trying to create a very simple dynamic block for a elevation of a countersunk hole. 


There are four inputs that matter:

D1. countersink diameter

D2. hole or drill diameter

D3. depth of material

R. rotate the whole block


The problem is the throat line.  I've been tinkering around with geometric constraints trying to get it to move the throat line by its endpoints which are the intersections of the countersink and drill wall lines.  The linear movement of D1 & D2 generates 2D movement of these endpoints.  Angle constraints keep the angles of the walls correct but when I constrain the endpoints the movement of either D1 or D2 produces unexpected chained movements of the other lines.  D1 (countersink) should not move the drill wall line but it does.  That should stay where it is while only its endpoint at the countersink moves up and down.  Maybe I just don't understand the math of what drives what and I selected or contrained elements in the wrong order.  Or am I trying to do something that AutoCAD is incapable of doing?


I've attached a sketch of what I'm trying to accomplish and the failed block.


AutoCAD 2010

AutoCAD LT 2013

Revit Architecture LT 2013

Active Contributor
Posts: 46
Registered: ‎03-24-2011
Message 2 of 2 (137 Views)

Re: not understanding constraints in blocks

01-10-2013 06:24 AM in reply to: kwg06516

Not a block, but see attached

Dell T7500
x5690 Xeon 3.46/3.73GHz
48Gb, 12 SSDs, Quadro 2000,
K40 Tesla, Win7 x64
AutoCAD Mechanical 2015
Ansys Mechanical 15
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