Rotary Woes

[tperry5XEH6]

So I have spent the last week or two trying to figure this out. I am pretty convinced it is a bug in either the post processor (Avid CNC EX Rotary mounted along Y) or fusion CAM. As I can not find anything that makes it mill right. However I could still be wrong.

My observations.

• Entire part is rotate along the y axis. In fusion the +Y axis is facing away from us, on my machine that rotary is mounted along the Y axis with the chuck at the far +Y axis, x+ is to the right. If there was a chuck in the drawing it would be at the back where the sketch is lightly shown. Why is it not cutting as it is defined in CAM with the Y0 X0 is at the back of the part?

• There is some issue, which I believe is related to the first, where when the part is rotated to cut the corner there is an issue where it does not fully cut on corner, in the simulation of Fusion 360 this cuts perfectly fine, and shows the bit where i expect it, in actual cutting it is offset, and never full cuts the corner between faces 2 and 3.

• When it rotates to cut the slots, it does not seem to be putting them in the same offsets as the first 6 operations, and we no end up with the slots being cut into the corner ( since it is on the wrong side. The slots appear that the would be in the correct position if part want not rotate around the y-axis for the first operations.

• I have numbered the faces and put a mark of which faces it should cut the angle tops and and even before cutting the piece show here I knew it would be wrong, because face 1 is the face on the fusion drawing facing up to the right and face 4 is the one to the left both with the slots in it. However when I rotated it prior to cutting based on the G0 A0 commands and labeled the end of the piece with the face numbers you can see that the intersection of face 1 and 4 are on the top right, not top left.

I have added the simple fusion test file to this post.I have created a simple fusion test file and rand this multiple times, and am totally lost on how to get it to cut right. I am glad I started with common pine to test this on the project and it is all scrap 2x6..

I am completely out of ideas. But something is definitely not working right.

Any help is appreciated.

Thanks,

Tim

     

[a.laasW8M6T · Accepted solution]

Hi

It sounds like you potentially have two issues.

First I think you need to flip the rotary axis in the machine definition

Secondly your WCS on the Machine may not be accurately located on the rotary centerline.

I'm not sure how you are establishing that location on your machine but to get expected results this needs to be set up pretty well

[tperry5XEH6 · Accepted solution]

Scott,

Thank you!  I swear I knew it was rotated, but could not find where to change it.  First off I was using a cloud version from the manufacture of the machine, so I could not change it and never went in and looked at what options there was.   Second because I didn't know what term to search for.   However flipping the rotary axis fixed everything.  The Z center is found with a precision ground rod in the chuck probing the top, then subtracting the radius of the rod, x is found by probing both sides and finding the center.  That works great, the manufacture AvidCNC has a great macro they wrote to do exactly that. 

If you PM me your favorite coffee spot, resturaunt, etc I owe you a gift card!   I was sure it was something stupid, thank you again!

Tim