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Re: The ghost is back in the machine
Posted: Sun Jul 18, 2021 12:19 pm
by Dave_C
The panel is grounded to a large copper rod in the ground.
I hesitate to even weigh in on this but some jurisdictions don't allow for a second grounding point in a buildings electrical system. It creates two points of reference to ground and can create ground loops! Not saying that is your issue..
For example if a shop has a main panel it will have a ground buss that should have a ground rod. But if there are sub panels through the same shop, they should not have additional ground rods.
The idea is that all paths to ground have near zero potential.
One test I have people do when they are having noise issues is to take a volt meter and measure the AC voltage between the ground side of a 120 plug and the safety ground lug and see if there is voltage. I've seen 3 volts and higher in some cases.
But, if you are not using any 120 volt circuits in your cabinet then this is a moot point. Depending then on how your 240 volt circuits are safety grounded you can still induce stray voltages from bad ground systems.
It just a thought and may not be your issue at all. Talks 30 seconds to do the test!
Dave C.
Re: The ghost is back in the machine
Posted: Sun Jul 18, 2021 12:32 pm
by tuffduck
There are no subpanels. I am running 220 volts.
I will do the tests you suggest and report back.
Re: The ghost is back in the machine
Posted: Sun Jul 18, 2021 3:18 pm
by tuffduck
First round check is 118.3 volts.
Re: The ghost is back in the machine
Posted: Sun Jul 18, 2021 7:44 pm
by tuffduck
Second check 118.3 volts. Here is the latest report.
Re: The ghost is back in the machine
Posted: Sun Jul 18, 2021 10:20 pm
by ShawnM
BDubs wrote: ↑Sun Jul 18, 2021 9:08 am
Chipload...I'm not trying to break stones here but...Forget chipload. Few have any clue that the SOLE PURPOSE of chipload is to maximize tool life and NOTHING ELSE! Furthermore, you will be very hard pressed to EVER be capable of running the chipload numbers recommmended by tooling manufacturers on a hobby type machine. It lacks the stiffness, power and hold down to run those numbers. They are NOT feeds/speeds that you should run...My advice would be to start at 120 IPM @ 18,000 RPM and adjust as required to find YOUR number for YOUR machine. Using the 'grassroots method' of Sight/Sound/Smell - If it's struggling, increase RPM or lower feedrate; If it's burning, lower RPM or increase feedrate; If it doesn't sound right, adjust RPM or feedrate to overcome the unique harmonics of the material you are cutting. I'll venture to say that you know how your material should cut using your preferred tooling. Adjust to what sounds/looks right and you'll be pretty close to ideal. Every piece of lumber (because it is natural - even from the same tree) is different...so what worked on one may not work on another.
Your philosophy might work if you're only chopping wood on a hobby grade machine.
Re: The ghost is back in the machine
Posted: Mon Jul 19, 2021 12:04 am
by tuffduck
Any ideas?
Re: The ghost is back in the machine
Posted: Mon Jul 19, 2021 5:56 am
by BDubs
Exactly Shawn.
Ideas? Yes - Buy a block of Centroid Factory Support time...
https://centroidcnc.com/techsupport.html
Re: The ghost is back in the machine
Posted: Mon Jul 19, 2021 7:33 am
by tuffduck
So Acorn is not a DIY solution?
Re: The ghost is back in the machine
Posted: Mon Jul 19, 2021 8:11 am
by Dave_C
First round check is 118.3 volts.
I see your location is in Canada, Correct?
I'm not familiar with Canadian power grids frequency or voltage setups. So what is the 118.3 Volts? Is that one leg to ground?
Dave C.
Re: The ghost is back in the machine
Posted: Mon Jul 19, 2021 9:39 am
by martyscncgarage
Pull Acorn out of the cabinet.
Put it on the bench.
Connect only the power supply that came with Acorn to Acorn.
Connect the Ethernet cable that came with Acorn to your CNC PC and Acorn.
Rename your current CNCM directory, to something like CNCM - 210719
Do a FRESH INSTALL of 4.64
Run the bench test. Run a program
Check the Error logs.
Report back
If you have a modern electrical system, there should be NO need to have a ground rod at your machine. I would disconnect that.
AT the machine's power source, (Receptacle, junction box, disconnect) check voltage PHASE TO PHASE and each PHASE to Ground post the results.
You should have a ground wire from your machine power source all the way back to the electrical panel.
Marty