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I got stuck animating this crank, I don't know how to use Inverse Kinematics enter image description here

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    $\begingroup$ You provided nearly no information. Provide blend file and/or your armature settings and what you tried so far $\endgroup$
    – Chris
    Oct 18 at 9:13
  • $\begingroup$ You should watch some tutorials for IK then, this is a bit complicated to write whole answer, you need to make one part rotate and other parts will be affected by it $\endgroup$
    – MikoCG
    Oct 18 at 9:37
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Edit: This solution, which is a simplification of Eng Morph's tutorial, seems to work better:

enter image description here

Create a 4 bone armature:

enter image description here

Bone 2 is parented to bone 1. Bone 3 is parented to bone 4. Give bone 3 an IK constraint with bone 2 as Target. Select bone 4 in Pose mode and in the Bone panel > Inverse Kinematics, set IK Stretch to 1 and activate Lock IK on X and Y:

enter image description here

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  • $\begingroup$ i got confused at the limit location step. when i follow your instruction, the bones go like crazy. i really need to understand this so please teach me. i will send you the blender file $\endgroup$ Oct 18 at 12:01
  • $\begingroup$ yes please share your file, use pasteall.org/blend $\endgroup$
    – moonboots
    Oct 18 at 12:05
  • $\begingroup$ the file is too big. it's 130 MB! $\endgroup$ Oct 18 at 12:16
  • $\begingroup$ this is the link : firestorage.jp/download/… $\endgroup$ Oct 18 at 12:19
  • $\begingroup$ Ok so there was probably a problem of circular dependency, I've edited with another solution $\endgroup$
    – moonboots
    Oct 18 at 13:36

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