after i get some were between 40 to 100 lines. constraints begin getting messed up.
what provokes the messups....
--rebuild
--update
--changing a dimension
--adding a line, circle, arc.
--deleting a line, circle, arc.
--ctrl+z = undoing a line, circle, arc.
--move, copy, rotate, mirror, rotation pattern.
===============
autodesk 2013 proffesional (student version) with service pack applied during install. everything else at default install for autodesk.
win 7 home premium.
old computer, ram was going, bad, so i updated, motherboard, cpu, video, ram, power supply (basicly new computer) except hard drives, and memory card rearder. did a nice clean format reinstall of win7 applied all updates, for win7, drivers, office 2010. re-ran memory tester 64+ to double check memory on new setup. all good.
new setup...
amd A-10 5800K not overclocked CPU (quad core, with video in the cpu)
16 gig ram
asus motherboard.
old setup
pentium dual core, i want to say 2200mhz but i do not remember specific model
4 gig ram
intal motherboard
problems happened on old and new setup.
=================
open up autodesk
open up standard part
create a sketch on xy plane
begin drawing circle, some lines, arcs, using split, trim, and basic constraints of parrallel, 90, tangent, etc...
after i begin getting so many lines drawn (complex) setup, were i might rely on auto calculation, for length of lines drawn between a couple circles. to cut out a piece, things begin going ugly.
i have tried disabling auto applying constraints. and no go.
i try my best, to stay with putting in a dimension, vs relying on [|] centering command, or rotation pattern, or equal = commands to place dimensions, but as soon as i get so many lines or arcs or circles, things go ugly. the more i try and stay with direct dimensions longer it seems i can go, but just one slip. and it requires almost complete redraw of the sketch.
i have noticed, some times, using "ctrl+alt+del => task manger.exe" and checking on performance of cpu's and ram usage. some times autodesk will use all 4 cores of the cpu, and when things start messing up, it will get down to a single core, and the other 3 cores will not show any sort of usage.
===========================
of attached document
sketch 1 = it is showing 7 dimensions being needed to fully constrain. 😞 wrong should only be 2 or 3 needed.
gave up on 1 and started sketch 2
see sketch 3, for when problem circle and a line split up into 3 segments is giving problems in sketch 2. as soon as i try to apply just a single constraint. to the circle or line, autodesk thinks it is fully constraint, and unable to apply 2nd constraint to fully place circle.
sketch 3 i am able to project lines, and position the circle like wanted. but not able to in sketch 2.
===========================
the problem, is just not this sketch, but i can repeat it day in and day out.
heck i have kept things simply and only a few lines per sketch, and used multi sketches. but once i hit a X amount. things begin messing up.
there is no special doings ilogic, iparts, spreadsheets, rules, etc... just lines, arcs, circles, basicly what ever shows up on either 3D model menu or 2D sketch menu bar. and not going outside of those menus to do anything else but to change apperance.
at times i get ""negative constraints"" vs being fully constrainted...
this is extremely frustrating. to point i just want to drag and drop autodesk to the recycle bin. and say forget it!
This file would seem to indicate that you have not been instructed properly in how to use Autodesk Inventor.
Do this experiment -
Edit Sketch2 in the file you posted.
Notice that there is pink geometry (sick geometry - you should never have this).
Right click and select Show All Constraints - what do you see on the screen?
The proper technique is to pattern features rather than sketch entities.
You might read this document
http://home.pct.edu/~jmather/SkillsUSA%20University.pdf
and this one that covers much of the same stuff, but in a little more depth
http://home.pct.edu/~jmather/AU2007/MA105-1L%20Mather.pdf
Then attach your files here one-by-one for a discussion on how each file can be improved.
The problem is the sketch in this file. It is a poor technique.
In order to fully constrain Sketch1, I added a few dims and a few constraints. Below is what I did.
I have no idea what you are trying to accomplish in Sketch2. Try to keep your sketching to a minimum. You will learn this over time.
Spend some time going over the tutorials.
Attach a finished part however you can get it done. Then someone will show you the correct way to do the part.
Forget you ever say autoconstrain/dimension.
I don't think you will get very far very fast unless you attach a finished part here.
Everything you wrote in last post indicates a convoluted, unstructured, trial-and-error approach to modeling.
Do you have a picture of what you are trying to model - or a picture of something very similar to what you are trying to model in the file you attached here?
Hi boggen,
In addition to the previous advice, please have a look at this link:
http://inventortrenches.blogspot.com/2011/03/inventor-101-simple-fully-constrained.html
Keep your sketches simple and you'll see the frustration disappear, and more quickly get the results you're after.
I hope this helps.
Best of luck to you in all of your Inventor pursuits,
Curtis
http://inventortrenches.blogspot.com