I have a rather confusing issue. On my MR-1 I am trying to cut a simple part which consists of a block with 2 cuts on either side. The model is shown in the top center of the image.
As you can see, the length of the left and right edge are the same. I simulated it in F360 CAM and it shows the edges being equal after the cuts. However, I ran the program on the MR-1 and I got a part where the left and right edge were ~2mm off from each other. One was short by 2mm and the other longer by 2mm. Shown above “Try #1” in the image.
Ok, I might have zeroed in the part incorrectly or some other setup mistake. A week or two passes, the power goes out at some point so the machine losses position. I restart the machine, zero in a new piece of stock, create a brand new program and run it again. I get the same exact result which is shown above “Try #2” in the image.
I try a different end mill and different feeds and speeds on a 3rd piece of stock and the result remains the same. The two edges are consistently a good 2mm off from the model. I have no clue what else could be going wrong. I checked the X and Y axis carriages and everything seems tight. This machine has made accurate parts before, so I am confused on how it could suddenly stop being accurate. Any suggestions would help a ton!
Can you post a snippet of the code doing that top feature that’s off center?
I can drop it into an NC editor and see if it’s in the program. With it being consistent, I’m leaning toward the program being off from how the work coordinate is set up. Could be that the work coordinate in F360 is set from a stock edge that doesn’t exist during this operation, throwing it off by 2-3mm. I may very well be wrong, but the code will tell for sure though.
I guess skipping steps is a possibility, but it looks like the stock wasnt square in the vise (espeically the second try). That might just be the angle the picture was taken from.
Have you tried to do it without using a program, just using a jog setting and manual spindle control?
I agree with @Skipshift. About the WCS being located wrong. If you set your WCS on the left upper edge of the part in F360 and your stock is .040 or 1mm larger on all edges there is your difference why you are shifted to left . Go and check in the setup where your WCS is. If it is on the part corner move it to the stock corner. Or if you don’t want it that way then when you edge find or probe your stock adjust the machine WCS zero point by how much the part is inside the stock
Sure thing.
Looking at the tool path, assuming the 4.762mm (~.1875") mill diameter is correct, the right side would be about 5.465mm (~0.2151") from your work coordinate. Left side would be about 12.205mm(~0.4805") from the work coordinate. The lug left behind would be about 6.74mm (~0.2654") wide.
So your program is close to the 5mm length you’re after. I’d double check the X offset for G54 in cut control vs your setup and verify that it’s at the edge of your part. I don’t really see a reason for the cut to be off from the program though. How are you getting your X zero offset?
I think Skipshift mentioned that the F360 WCS may be the issue . What part of the stock are you setting as the WCS , center? top left?, bottom left?, top right?, bottom right? Is your stock in F360 under setup the same size as the actual stock?
