So i just upgraded my Z axis with the CNC4Newbie slider. After installation I wired up a new stepper motor and checked to make sure i wired everything up correct. Thankfully everything did exactly what i wanted it to. Once i updated my GRBL setting however something is making an odd noise. I went back to my original stock GRBL setting and it went away. I’m wondering if it’s a speed difference causing the change in tone or what? Has anyone else had this issue. I’ll try to post video’s as well…
i guess i cannot upload the video’s here so here’s a link to the google drive folder. Video’s should be labeled as which is which…
What are your old/new values for:
Have you changed the micro step values for Z stepper?
The old Value for $102=188.879 (or something very close to that) My new value for $102=50.0125. I didnt know anything about $112 or $122…
Steppers can have different harmonic resonance depending on their speed and motion. Sometimes you hit a weird frequency and it sounds like she’s going to break apart.
Adjust your micro step to 1/8 ans adjust your 102 again. It will be really smooth!
can you explain how to do this?
What kind of controller do you have?
I am using the stock X controller which was purchased in late 2019.
On the red switch block to the right (Z) change switch to ON/OFF/ON. Default is OFF/ON/OFF.
This change microstep setting from 1/2 step to 1/8.
You may need to fine-tune your $102 value (applies anyhow) to get maximum accuracy.
Also installed cnc4newbies… 7in travel.
I made suggested changes (I think correctly)
The z travel is fine while moving manually (1" = 1") but while cutting it seems to be different going up then down. The up travels seems too much. First pass is correct depth, second barely touches wood.
Move to a new shape, just cutting air.
Figured it out, might be worth noting for others…
The settings work great. The issue was mechanical.
With the risers my regular bits are too short, so the cut (in1/2in wood) was reaching the bottom endof the z movement, so obviously it kept going up, but never got to go down. Added a 1/2 piece mdf under cut and good to go.