Join our MCAD Central community forums, the largest resource for MCAD (Mechanical Computer-Aided Design) professionals, including files, forums, jobs, articles, calendar, and more.
I took it as they want to change the orientation of the arrow in the pin connection. To my knowledge the direction of the connection arrowisn't something you change the direction of. It is defined as being normal to thetranslation plane of the assembly reference and the arrowsshow the positive directions for translation offset and rotation direction.
I understand it like kd2007 said. In the past when I needed to change direction, I had to either reorient the feature relative to the datum plane or create a second datum plane with the positive axis opposite to the original plane, then redefine the feature reference to the second plane.
And then in mechanism i need to set 2 gear pairs but the pin connection arrows were on the same position and i could click only on one. The other was "hidden" inside the first one.
So i did a lot ot things and somehow (still dont know how) assamble 3 parts in the way 2 arrows pointed to diferent directions. And then i couldclick both like a charm. And the darn thing worked like it should in the first place.
I think the Direction for the Pin Connection is based on the Positive direction on the Axis based on Right Hand rule. If Fingers are holding the Axis the Thumb is pointing in the direction of the arrow.
Too bad emoticons are fans of the left hand rule
.
If it's an axis of the solid feature try reversing Revolve Direction. Or create and test Axis from two planes Front+Right versus Right+Front and see if that gets you the proper direction arrows.
You're right that its based on the right hand rule which is what I was getting at. However looking at planes and axes, planes have a positive and negative side axes by themselves don't. So the direction of the pin connection arrow is going to be controled by the orientation of the planes. Reorient PartC so that the translation plane positive direction is matedto the translation plane of PartA (planes positive sides face in opposite directions) your pin connection arrow will be reversed. I've assumed you are using the same PartA assembly reference for both the PartB and PartC connection.
After thinking some more on what you said I believe I know what the pin conection symbol is. I think it's a moment vector showing the sense of the moment and the direction of the tendency of the object to rotate to rotate.
After thinking some more on what you said I believe I know what the pin conection symbol is. I think it's a moment vector showing the sense of the moment and the direction of the tendency of the object to rotate to rotate.
I did a little more checking and this statement is not correct. It's a DOF symbol showing the sense of the displacement along the axis and the rotation about the axis. When creating the axis select Front-Side vs Side-Front the direcetion arrow changed but the translation offset was not what I expected. Instead of the part moving down it moved up. To get the offset right I had to add a datum plane on top of the Top plane with the positive side facing down.One way to look at the creation of the axis and determining thesense of the conection arrow is when selecting Front(z)-Side(x), by right hand rule fingers point in z(k) direction and you curle them into x(i) which gives you a sense in the y(j) direction. For Side(x)-Front(z) your fingers point along the x(i) and you curle them into z(k) which gives you a sense in the -y(-j) direction.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
