Centroid Community CNC Support Forum

You're telling me buddy!

So here is todays issue, I PROMISE I have looked through both manuals, I'm missing something.

I have the machine dialed in o within .001 on the Z, and less than .001 for the x and y. I got my rapids and homing set up again, NOW

My tool sensor is not working to measure the tools. it was working properly before for performing the "method 1 router" technique for zeroing material and tools. The wiring has not changed, so I know its in the settings I changed somewhere.
Currently the sensor is working to send signal when touched to the tool. but the z axis does not stop, just plows through. luckily i had my finger on the cycle cancel button and did not break something. anyway, Thanks again for all the help. I have learned ALOT so far, and its largly due to you guys, so thank you. I've attached a current report.

alright, i guess ive lost you guys. last thing, the voltage going to the vfd dips during operations. at a seemingly random interval. When i measure the voltage at the acorn board the voltage smooths out. any ideas?

videos in the drive folder

Asdoyle1221 wrote: ↑Thu Jul 10, 2025 6:04 pm alright, i guess ive lost you guys. last thing, the voltage going to the vfd dips during operations. at a seemingly random interval. When i measure the voltage at the acorn board the voltage smooths out. any ideas?

videos in the drive folder

For the voltage fluctuation, I'd take a look at this thread: viewtopic.php?p=46032#p46032

It does look like random fluctuation that can be solved by implementing one of those circuits.

centroid467 wrote: ↑Fri Jul 11, 2025 9:24 am

Asdoyle1221 wrote: ↑Thu Jul 10, 2025 6:04 pm alright, i guess ive lost you guys. last thing, the voltage going to the vfd dips during operations. at a seemingly random interval. When i measure the voltage at the acorn board the voltage smooths out. any ideas?

videos in the drive folder

For the voltage fluctuation, I'd take a look at this thread: viewtopic.php?p=46032#p46032

It does look like random fluctuation that can be solved by implementing one of those circuits.

Yep, with the circuit in 5.jpg I have a very stable rpm on the spindles +-5rpm from actual to commanded with constant load.

Uwe

Do you have a capacitor across the 0-10v output to stabilize it?

Ken Rychlik wrote: ↑Fri Jul 11, 2025 1:43 pm Do you have a capacitor across the 0-10v output to stabilize it?

I do not. I did not see that in the manual. i did see the snubber caps on the contactors, but not on the analog output. What size do you recommend?

Also, I know this is something simple, but im stuck again.

I've been running the machine fine besides the spindle speed variation, and one other thing. when i rus a program every single time, after ive measured the tool and zero'd th DRO on the part, i start the program and the the bit plunges all the way into the bed before moving to its first x,y destination.

It seems like its removing the tool stickout from the zero point i give it.
I can then cycle stop, re zero the z axis, and then run the program with no problems. i know its something to do with my set up but i dont know what.

Ive attached a report.

G53 z zero should take the machine to Machine home which "should be" at the top. That's where it should go when starting a file.

I use a 22 mf cap rated for 50v but I'm not sure what the official suggestion is. Mine are polarity sensitive and the old black can style, except very small. On Yaskawa vfd drives, I don't usually need them, but on cheaper drives it is necessary.

Maybe attach a toolpath that is diving into the bed and we can see what it is doing. Cutting Z zero and Machine Z zero are two different things.

Ken Rychlik wrote: ↑Fri Jul 11, 2025 2:13 pm Maybe attach a toolpath that is diving into the bed and we can see what it is doing. Cutting Z zero and Machine Z zero are two different things.

it is every toolpath.

So, When i press cycle start, the machine goes to xz zero and z home. (all the way up) and asks to insert tool and press cycle start.

Then, the spindle turns on and the bit plunges into the table, except it doesnt because i stop it before it crashes. then i jop to the material surface, hit zero z axis.
then cycle start. and it works. after i go through that once, i can run following programs on the same workpiece no issue.

i feel like im not setting up the job correctly. measure the tool, zero the tool on the material for the wcs, and run?

I assure you guys I am trying. I'm just in a different world. I am learning, but im also working nonstop so i dont have ages to put in at once. Please forgive me.

Yes, please attach a gcode or intercon file that shows this behavior. Even if every single file you have tried does this, seeing what commands you are executing will give us big hints.


The capacitor/snubber circuit is not in the installation manual but probably should be in there. The values are not exactly critical but I would use those given in the other thread as a starting point - namely 0.1 uF caps and a 10 ohm resistor. Type does not matter that much here and voltage rating should be greater than 10V. It is usually a good idea to derate capacitor voltage.

With the Acorn, you don't have to worry about using a polarized capacitor since it only has positive output. If at some point you implement this circuit on a controller capable of +/- 10V signals then use a non-polarized type.