Revolute Joints

[vcutajar]

Hi

While I was trouble shooting a problem I am having with revolute joints I noticed that when doing these revolute joints sometimes after the joint is made the component makes a full turn but at other times it does not do this.

Why is this?  I am sure I am doing something different but can't figure out what.

Regards

[g-andresen]

Hi,

please show your process in a screencast

günther

[vcutajar]

Thank you for the reply.

Unfortunately, I cannot reliably replicate the situation.  Sometimes it does it and somtimes it doesn't but in both scenarios the revolute joint is successfully created.

This brings me to my original problem.

I am having a problem with four revolute joints.  I made a new minimalist assembly to remove all the clutter.  I used the Paste New for the assembly so that I can export it as a .f3d file.  Also painted the components for clarity.

The only way to do all the four joints is to Unground the Baseplate component.  This tilts the whole model and also I cannot rotate any of the joints.  Seem to be in a mechanical lock.

If I Ground the Baseplate component one of the revolute joints breaks and cannot be remade.  I've been at it for a couple of days and can't think of what's wrong (I am no expert).  Sometimes I think that this cannot even be done.

Help please

Regards

[jhackney1972 · Accepted solution]

You just have a little misalignment along your path.  If you change the last Revolve Joint to a Cylindrical Joint it all works fine.  Oh, you must ground the base also.  Model attached.

[jhackney1972]

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[vcutajar]

Thank you John for the help

Never in a million years it would have crossed my mind to use a cylindrical joint to solve the problem.

I will try to ferret out the slight misalignment you mentioned but if it's very small I doubt I will manage to find it.

Vince

[jhackney1972]

Do not waste your time looking for the misalignment.  The method I used is a common practice when creating multiple joint linkages.  When building up assemblies, small linear errors in the direction of the axes is hard to avoid and a Revolve Joint is going to find it.