# Rigid-body constraint convergance problems

**URL:** <https://calculix.discourse.group/t/rigid-body-constraint-convergance-problems/369>\
**Category:** Uncategorized\
**Created:** [December 22, 2020, 11:04pm UTC](https://calculix.discourse.group/t/rigid-body-constraint-convergance-problems/369 "2020-12-22T23:04:05Z")\
**Posts on this page:** 1\
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**Author:** ![xyont](https://yyz2.discourse-cdn.com/free1/user_avatar/calculix.discourse.group/xyont/32/3553_2.png) [@xyont](https://calculix.discourse.group/u/xyont)\
**Post date:** [December 29, 2020, 5:35pm UTC](https://calculix.discourse.group/t/rigid-body-constraint-convergance-problems/369/7 "2020-12-29T17:35:55Z")

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hi @Matej

alternatively, you could solve these problem using coupling keywords. solved fast by 3 iteration only, as can be seen in attachment picture below.

best,

 ![2020-12-30 00_30_29-ShellDC](https://global.discourse-cdn.com/free1/uploads/calculix/original/1X/4c69aedce271622f82474db2c12c79cc80ce4e3c.png)

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