I am trying to do a basic extrude following the tutorial. i create my
sketch and continue to the extrude properties and i don't get any
preview and when i click ok on that screen i get an error message saying
"The sketch contains a zero-length entity"
im using 2006, any ideas?
usually this means that you have a line (or other geometry) in which the end
points are on top of each other -- in otherwords you cannot have a line
between two points that are on top of each other - you can only have a
point. This can happen when changing dimensions in a sketch which might
cause other geometry to become (zero length). A diagnostic tool can help
you find the offending geometry. Go to
Insert --> Sketch tools --> check sketch for feature. Then click ok -- get
the same error -- click OK on the error -- Move the check sketch dialog box
out of the way. You will notice geometry highilghted in green -- zoom in to
all the endpoints of that geometry to see what the problem might be (as the
problem may not be the acual highligted geometry, but rather the surrounding
I hope this helps
i don't have any of that, i just drew a rectangle using the origin as
one of the points. when i run the check sketch it highlites the lower
line green. i even went as far as deleting the line and redrawing it,
Is this happening in an file that is existing, or just in any new file
when you try and extrusion? If when you do that check sketch for
feature, and it high lights something in green, then there is something
that is overlapping that needs to be deleted. You can always choose the
contuor select optiona dn then just choose the contour you would liek
If this is happening with a brand new file, meaning you start a new part
from File > New or the New icon, then it could be that you've got
something hosed in your template. If there is a sketch already in your
part template, then delete the sketch from the feature manager, save
this edited version as your part template, and try again.
If your template doesn't have an existing sketch, and this is happening
from a new part, I would uninstall SW, clear out your SW registry and
Otherwise, if this is on some part you've been working on, you might try
to drag boxes around the endpoints (drag left to right) and see if
something gets selected that you can delete.
Zero length sketch problems are among the most frustrating to me
personally because when you've got one (or several), you can't do much
with your sketch until you fix all of them. If you have two and only
delete one, it will tell you the sketch is unsolvable and put it back to
its prior condition (with two problems instead of one). When this
happens, I just blow away the whole sketch unless it's fairly
complicated or difficult to recreate.
A lot of times beginning users who haven't quite picked up the knack of
sketching in SolidWorks run into this problem, starting and ending a
line or arc at the same point.
Anyway, good luck.