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Defining the kinematics for my weird 5axis machine

Anonymous

Defining the kinematics for my weird 5axis machine

Anonymous
Not applicable

Hi all,

I have a quick question about defining the kinematics of my deckel maho dmu50v. 

On this machine the spindle moves in the x y and z axes, while the part is mounted on the c and b axes. The b axis is canted at a 45 degree angle in the y-z plane and is limited to 180 degrees. The c-axis is fully rotational. So, B at 0 degs, the platen is flat on the x-y axis and B at 180 degs, the platen is flat on the x-z plane (or rotated -90 degrees along the x-axis). Its best to not think about it too hard. 

 

The first question is, does it matter how the axes are listed in the kinematics while defining the machine? It doesn't look like it affects anything but I would like to make sure. 

 

My second question: is the b-axis vector 0,-1,1? I'm basically using my right hand thumb to point in the direction of the axis of rotation and graphing the location of the tip. 

Thanks

Shawn 

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johnswetz1982
Advisor
Advisor

Try checking out this forum posting, it may or may not help but is worth a try? DMU60 monoblock Postprocessor  

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Anonymous
Not applicable

Thank you @johnswetz1982 , but that post didn't help. 

 

My questions aren't about the post processor, but rather about the kinematics section when defining the machine. 

 

Does the order in which the axes are listed matter, and is the b-axis 0,-1,1?

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johnswetz1982
Advisor
Advisor

I meant the part where they were talking about the kinematics of the machine and the example provided by @Laurens-3DTechDraw .

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Anonymous
Not applicable

Please bear with me, as I only started using Fusion360 yesterday and I am not familiar with how things work with it yet. My impression is that the CAM produces an NCI file that the post processor converts into an NC file the machine can use. My concern right now is just in the CAM part, where you define a machine. I'll worry about the post-processor later to prevent my brain exploding. That I suck at explaining things doesn't help, I'm sure, and I am appreciative of any help and patience. 

 

I have a screenshot of what I am talking about:

defining a machine's kinematics within the CAMdefining a machine's kinematics within the CAM

as compared to this:

a better organized kinematics treea better organized kinematics tree

I believe the two different kinematic trees shown makes a difference, but I am not sure.

The b-axis has two non-zero vector components [0,-1,1] and I want to make sure that is correct as well. 

Here is a video of the weird kinematics: https://youtu.be/nYntzIhpIZM

Thank you

Shawn

 

 

 

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