# Rotation control doesn't work **URL:** \ **Category:** General Questions\ **Tags:** dynamic\ **Created:** [October 2, 2023, 1:08pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139 "2023-10-02T13:08:13Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![am5320](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@am5320](https://prepomax.discourse.group/u/am5320)\ **Post date:** [October 2, 2023, 1:08pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/1 "2023-10-02T13:08:13Z")
I made a testing rig with two parts that are supposed to rotate 90 degrees but both of them stop at a smaller angle. Does anyone know how to fix the rotation so it fully rotates? ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [October 2, 2023, 1:56pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/2 "2023-10-02T13:56:23Z")
How did you apply the rotation ? Can you share some screenshots or at least describe the details of your model ? ---
**Author:** ![am5320](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@am5320](https://prepomax.discourse.group/u/am5320)\ **Post date:** [October 2, 2023, 2:28pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/3 "2023-10-02T14:28:41Z")
![settings](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/8/8477ba969452e6a3cee065448d244ab5c8c969df.png) This is the rig and the settings of 1 side, the other side has the same settings, except the angle has a different sign. ---
**Author:** ![am5320](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@am5320](https://prepomax.discourse.group/u/am5320)\ **Post date:** [October 2, 2023, 2:29pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/4 "2023-10-02T14:29:37Z")
![rig](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/9/968947c16d124a3ed2ee811ed44e28838c25f96e.png) This is a picture of the rig. ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [October 2, 2023, 2:33pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/5 "2023-10-02T14:33:42Z")
I assume that those boundary conditions are applied to reference points of rigid body constraints. Is the analysis completed ? Did you set the deformation scale to “true” ? It would be best if you could share the file but I understand that it’s not always possible. ---
**Author:** ![am5320](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@am5320](https://prepomax.discourse.group/u/am5320)\ **Post date:** [October 2, 2023, 2:43pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/6 "2023-10-02T14:43:09Z")
Where can I change the deformation scale? ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [October 2, 2023, 4:06pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/7 "2023-10-02T16:06:38Z")
You can find this option here: ![scale](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/f/fe556a03e5499a35782079ac015eae89b17bb18d.png) ---
**Author:** ![ANYS](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/anys/32/7737_2.png) [@ANYS](https://prepomax.discourse.group/u/ANYS)\ **Post date:** [October 2, 2023, 4:35pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/8 "2023-10-02T16:35:51Z")
1.365 rad each part in opposite direction makes an overall rotation of 156º. That’s a lot and I think your problem is different. ---
**Author:** ![am5320](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@am5320](https://prepomax.discourse.group/u/am5320)\ **Post date:** [October 2, 2023, 4:37pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/9 "2023-10-02T16:37:39Z")
Thanks! It didn’t change much in the end. To answer your previous questions, yes 2 references points were chosen with rigid body constraints. The analysis completes once I turn off NIgeom, but neither parts of the rig rotate 90 degrees. If I turn NIgeom on then the analysis fails but with results rotating up to the same angles as with NIgeom off. I am not quite sure what is going on. ---
**Author:** ![ANYS](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/anys/32/7737_2.png) [@ANYS](https://prepomax.discourse.group/u/ANYS)\ **Post date:** [October 2, 2023, 4:38pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/10 "2023-10-02T16:38:45Z")
It is failing close to 70º ?¿? ---
**Author:** ![am5320](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@am5320](https://prepomax.discourse.group/u/am5320)\ **Post date:** [October 2, 2023, 4:38pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/11 "2023-10-02T16:38:57Z")
I am trying to close the rig. Do you think large rotations aren’t possible? ---
**Author:** ![ANYS](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/anys/32/7737_2.png) [@ANYS](https://prepomax.discourse.group/u/ANYS)\ **Post date:** [October 2, 2023, 4:39pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/12 "2023-10-02T16:39:55Z")
I just posted the solution in Tips and Tricks. ---
**Author:** ![am5320](https://avatars.discourse-cdn.com/v4/letter/a/7ab992/32.png) [@am5320](https://prepomax.discourse.group/u/am5320)\ **Post date:** [October 2, 2023, 4:40pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/13 "2023-10-02T16:40:05Z")
![angle](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/e/e2b0b0b331566d71e128261529c1742beb76ee5a.png) this is the maximum angle it goes to. ---
**Author:** ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst)\ **Post date:** [October 2, 2023, 5:08pm UTC](https://prepomax.discourse.group/t/rotation-control-doesnt-work/1139/14 "2023-10-02T17:08:09Z")
Can you share the .pmx file ? It’s hard to say what’s going on based on those cropped screenshots.