B axis problem of 5 axis CNC machine

[Anonymous]

In our machine, the B axis rotates between 0 and 180 degrees. In the image, the b axis is perpendicular at 0 degrees (as it should be). In the image on the right, it shows 180 degrees instead of 90 degrees. It should show 90 degrees when looking from the side. When we make CAM, it prints B axis as 90 in the code we extract.

We look forward to your help. Thanks.

[ChristopherMarion]

Hi @Anonymous 

Since the B axis rotates on a 45 degree, it should show B180 in the code, but you are saying it shows B90 in the code.

If that is the case, I think the kinematics are incorrect in your post.

Open your post with Xbuild and look in Multi-axis page.  Perhaps choosing a different configuration will yield better results.

[Anonymous]

Hi @ChristopherMarion, First of all thanks for your help.

We are using fusion 360. I chose the wrong category when asking the question. Can you help if you know? 

[ChristopherMarion]

Hi @Anonymous 

I do not have a lot of experience modifying Fusion 360 posts, but I do know that there are two ways that Fusion deals with setting up the machine kinematics.

Option 1 :

The older way this is done is to hardcode this information into the post.  This is done in the "On Open" section of the post processor.  If you open your post and navigate to this section, you may or may not see something like....

var aAxis = createAxis({coordinate:X, table:true, axis:[1, 0, 0], offset:[0, 0, 0], range:[-120, 30],
cyclic:false, preference:-1, tcp:false});
var cAxis = createAxis({coordinate:Z, table:true, axis:[0, 0, 1], offset:[0, 0, 0], cyclic:true,
tcp:false});

In the preceding lines of code, you can see the setup for the output vectors for both the A & C axes.  I would think this is what would need to be modified to configure .  Your B axis I would think would have something like [0, 0.7071, 0.7071] instead of [0, 1, 0]

Option 2:

The post does not contain this information, but rather Fusion 360 contains this information inside of the machine configuration section.

This lines of code shown up above will not be present.  If this is the case, everything is defined within Fusion.

All of this information can be found within the Fusion 360 post processor manual that is available online here

I'd create this same thread in the Fusion forum.  I am sure someone there will have better information than I do.  You can also reach out to an Autodesk reseller for actual post modifications.  If you do not know of one in your region, you can go to the Autodesk Services Marketplace and look for one.

Good luck!