I am trying to create the behavior of a ratchet and pawl in Motion (2013). The behaviour is not what I expected, with the pawl 'breaking' through what should be the hard stop of the ratchet. Does anyone have any advice to offer?
I have applied downward gravity, a contact set between the ratchet wheel and the pawl.
Hi Jamil...thanks very much for the video. Yes, that is the behavior I was hoping for. I tried updating everything to 2014, but I don't get the same result. For your amusement, I've attached the result that I get. Also tried increasing the resolution but to no avail. I've attached the 2014 *.zip file now as well. It's probably time for me to try to work with SolidWorks support. Is it possible there is a setting that stays in the background (like a maximum motor torque) that you have properly set up in your system and I haven't in mine?
Hi Alan. Again, I opened the file and went straight to the motion study and recalculated and the behavior was correct. I never use motion studies, so I think my settings are whatever the SW defaults are. I wouldn't expect any system settings to affect the motion study results though, you'd think all relevant settings would be saved with the study in the Motion Study Properties.
Wait, that's weird. I just closed the assembly and then opened it again, and instead of calculating I just pressed play and it behaved like your video. After that i pressed calculate and it keeps breaking through. I don't know why the first time I opened it and calculated it worked fine. Now again I re-opened the file and calculated before playing just like I did the first time and it still fails.
Ok, now I closed SW and opened it again, then opened the file and calculated and it works correctly again. Closed and opened file and it fails.
So it seems like the motion study only behaves correctly if it is the first time you have opened that file during that instance of SW. Can you try restarting SW, then open your file and right away recalculate the study?
Wow! Thanks for your help in this. Now it works on my machine as well...some of the time. I just spent a good while trying to figure out a pattern, but every thing that I did sometimes resulted in the abnormal behavior and sometimes not. The truth is out there, but I don't know how to figure it out. Thanks for your help...I'll pass this on to SolidWorks.
if he saved the file, the play would be the bad results that he was seeing
then you recalculate and it fixes it, same as he is seeing
But if I open it, close it, then open it again and recalculate it doesn't work. It only works the first time I open the file during that instance of SolidWorks.
even with brand new studies?
When I said "doesn't work" I just meant the motion is incorrect, and the ratchet cuts through the wheel teeth instead of getting caught and stopping the motion. But the first time I open the model and calculate the motion is correct and the pawl stops the wheel. If I close the model and open again then the pawl cuts through the teeth.
I don't know about other studies, I was only checking that one assembly.
i don't see that you have tried the latest version and sp, i would do that first
if it is still a problem, try building a similar type assy and see if the problem still exists
if so, report to your VAR
I'm on 2014 and when I run the Basic Motion simulation it behaves correctly. Maybe they improved something in 2014. Also you could try increasing the accuracy and resolution in the Motion Study Properties.