Comment

Comment by Bart mcCoy on March 5, 2013 at 3:45pm

Thanks for all of the input. I do agree about all of the comments and should never make it out of qa inspection. My recommendation was confirm they were climb milling with the cutter. Maybe glad that all of my parts do not look like this.

Comment by Pat Kelly on March 3, 2013 at 8:37am

I'm a cnc machinist and those parts wouldn't have made it out of Q.A. where I work. I've never seen a cnc router in action but from what I understand they are more for thinner materials. They might be pushing it as far as the material thickness. Looks to me like their cutter was bouncing. To high of a feed rate for the rpm used or the cutter sticking out to far or both.  

Comment by Scott Sutton on March 3, 2013 at 8:06am

I get this too with my CNC router cutting aluminum. As Bruce said you can clean it up with some sanding. I solve this issue by fist making the part .012 larger that the CAD file and then programming my machine to do a clean up pass of .012 inch. But this causes the machine to take twice as long to produce parts, something that Zenith may just consider part of the builders responsibility? For me its not an issue to take twice as long to make parts considering that I have little to no post sanding when it comes off the machine.

Comment by Bruce Cobo on March 2, 2013 at 10:12pm

You can clean them up on a belt sander with little effort

 

Comment by Bart mcCoy on March 2, 2013 at 9:06pm

Chatter marks on these parts make me somewhat concerned! Zenith said they would be ok?? Has anyone found the same problem on similar parts?