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Tool height offset issue

Anonymous

Tool height offset issue

Anonymous
Not applicable

Good morning all,

 

I am having an issue on my Tormach 770 with certain tool height offsets. For example, when I machine a square pocket using a 1/4" end mill and a 2D adaptive pocket and then run a contour operation with a 1/8" end mill to clean up the walls and corners, but when the 1/8" end mill machines the perimeter it doesn't descend to the same floor, but it goes further in -Z and cuts into the floor while it machines the periphery. I have checked the G-code to make sure the Z height is consistent and that the G-code is calling for the correct tool height offset and I have double checked each tool offset.

 

I ran a test pallet where I machined 4 pockets, one each with 1/2", 1/4", 3/16" and 1/8" end mills and then ran a contour with the same tool that machined each pocket with no issue. It was when I ran contours with the other end mills that didn't machine the initial pocket that I ran into problems.

 

I am not sure where the issue could be but would appreciate any suggestions. Thank you!

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HughesTooling
Consultant
Consultant

Can you attach the G code for one pocket and finish contour using the 2 tools? You will need to change the extension to TXT to upload to the forum.

 

Mark

Mark Hughes
Owner, Hughes Tooling
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Anonymous
Not applicable

Thank you for your reply. Attached is the .txt G-code that I used for my test. I also attached two pictures showing the pockets that were machined.

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HughesTooling
Consultant
Consultant

Got to admit I hoped I'd find something wrong in the code but it all looks OK, all full depth cuts at -0.1.

 

As the code's correct you need to look at the setup and machine. What material are you cutting and how flat is it. Could it flex, how sharp is the larger cutter, looks like you're machining some sort of plastic, is it abrasive seen some glass fiber materials take the edge off tool real quick without coolant.

 

Can you accurately measure the depths, is the pocket roughing shallow or is the finishing too deep?

 

Mark

Mark Hughes
Owner, Hughes Tooling
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