Z-going to deep

[badboys cnc]

We zeroed the z with plate and set debth for .250. Our material was .230 The z went twice as deep as set into spoil board. The cut path debth checked ok. This is the second time this has happened. We then rezeroed and it went to the right debth. Same numbers on cut path. Any ideas? Thanks Richard

[bleeth]

Typically caused by lost steps due to static discharge/grounding issues. Search forum for "Grounding" and you will get lots of hits with info on this. Specific cause can vary depending on set-up, dust collection, etc. To analyze you need to post specific info regarding your machine, dust collection system and how it is grounded now.

[ken_rychlik]

make sure your design z zero and the way you set up the machine are the same. If you zero to the top of material in one place and zero to the bed of the machine in another it can do that.

[bleeth]

BTW:
Here's a link to the grounding article on the SB Wiki site:

http://shopbotwiki.com/index.php?title=Grounding_your_ShopBot

[Rob Gunn]

Richard, I always do a test move to zero every time I change and set a tool. This will tell me if my z-zero is correct. I see you are in St. Joe MI, I am in Buchanan, thats only 20 miles away. I am no expert but maybe we can help each other when we have issues? Your always welcome to come see my setup.

[badboys cnc]

Dave, thanks for the info. I am grounding my machine like you described on Friday March 29. We have a shopvac under the bot to clean up the table between sheets we cut. This morning I noticed I would get a pock off the machine while the shopvac was on. My hair was standing on end also and sure enough we lost communication and the computer shut down. I'll let you know how we come out after we ground it. I'll bet thats my trouble all this time. Thanks for the help. Richard Onweller

[bleeth]

Hopefully that is it Richard. Over the years it has seemed to me that some have more static issues than others, and sometimes it is a function of the current weather (humidity.) I have equipment in my shop with a hell of a lot more electronic/electrical stuff going on and have never had those issues with it. Grounding for them, of course, is built into the equipment and simply runs through the plug into the receptacle. Frankly, it is about bloody time that SB did the same thing with theirs. They are not hobbyist toys anymore.

[rayhipp]

mine was hitting top of gantry losing Z and going in to spoil board ,it turned out to be firmware problem

[Bob Eustace]

OK get the flame throwers out BUT since wearing antistatic work boots I have not had a comms problem and I was previously plagued with them almost daily.