Not sure what happened here. Machine went below 0

[buzzsawddog (No name - maker of things)]

So… Jacked up my bit and even got down into the aluminum I checked and rechecked the thickness. I had z offsets set. The bit set was used during bit changes. Thank goodness for that emergency stop button after I reset the machine I went back and checked the offset again. Sure enough I had enough room that I would have left a small amount of material on the bottom and should not have even hit my waste board…

What could happen to cause it to plunge so deep? Why would the machine go so deep below 0 on the z?

[WillAdams (William Adams (Carbide 3D))]

Possible causes here:

• endmill pulled out of collet — be certain to use a pair of good quality wrenches to fully tighten
• Z-axis was pulled into cut by high tooling engagement, see: Best Bit for full cut through - #2 by WillAdams
• machine lost steps due to intermittent electrical connection for Z-axis — let us know at support@carbide3d.com

[buzzsawddog (No name - maker of things)]

Learned something new today… Just went out and sure enough the bit pulled… It looks like I did not get it snug enough. Sadly the bit is trashed but… Worse things could have happened.