Welcome to the Onshape forum! Ask questions and join in the discussions about everything Onshape.
First time visiting? Here are some places to start:- Looking for a certain topic? Check out the categories filter or use Search (upper right).
- Need support? Ask a question to our Community Support category.
- Please submit support tickets for bugs but you can request improvements in the Product Feedback category.
- Be respectful, on topic and if you see a problem, Flag it.
If you would like to contact our Community Manager personally, feel free to send a private message or an email.
simulation failing
joshtargo
Member Posts: 269 EDU
I'm trying to just find out how much force/stress is on the long thin link (representing a cable).
all joints are revolute or cylindrical, plus the slot. the upper pin is fixed.
https://cad.onshape.com/documents/3cb0dff529a89bfaa045bc8f/w/9f7c7b8e9e7a0770e1038da8/e/45140b1c8148ea5342744129?renderMode=10&uiState=6734b4da064c920ea3597759
EDIT: Simulation ran, but is obviously wrong
0
Answers
Firstly, Pin Slot is not supported by simulation currently, so that is contributing to the unconstrained result in the first image. If you want to capture that sliding motion (where you have the pin slot mate currently), I recommend a Slider mate. It will take some mate connector realignment to align the Z axis in the right direction, but that should enable that motion.
You also mated the top pin (Part 5) to the back bracket (Part 2) which constrains it in the assembly, but because they are not touching, the simulation will not take that into account, again resulting in unconstrained rigid body motion. I recommend modeling all of the pins and making sure it actually contacts at the mate points. I highly recommend using the Connectivity visualization to look at how your parts will interact in the simulation, see below. See my example here with the slider mate, and the extended pin, it ran as you intended (I believe): https://bedfordstatics.onshape.com/documents/f460c5b34c146e085051dd19/w/8b92eb3e7e397e2f100ef8f4/e/2a25355661e73d735eb9a894
a slider mate in the slot would contribute a moment that is not there in real life. I tried with tangent, but that also gave strange results. I'll try again with longer pins…