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New to GRLB need guidance

Posted: Wed Dec 04, 2019 3:50 pm
by davet354tfd
I have an X-Carve, Using V-carve and Picsender. (Graduated from Easel)

Yesterday was my first try sending a file. Overall it went OK. I did not break anything!!

Yesterday the Z axis was raising quickly during the carving but it was taking a very long time to come back down when it was carving.

Today I ran another test piece (same one) and it went well. the z axis was a little faster but still looked slow coming back down, to me.

I have not made any changes to any settings because I have no idea what to change or what to change them to.

What do I need to go in and look for and what should they be set at?

Thanks from a very wet behind the ears newbie.


Re: New to GRLB need guidance

Posted: Wed Dec 04, 2019 4:58 pm
by Picengraver
There are no settings in PicSender to affect the gcode settings, but there are some in grbl. The grbl settings can be viewed, and changes made, by clicking the yellow GRBL button at the top of the screen.

What you are describing (coming up fast and going down slow) is most likely not a grbl setting, it is something that is determined by settings in your VCarve software.

The settings in grbl will look something like the following, but with different values to suit your machine. Be very cautious changing any of these settings until you become more familiar with grbl. It is possible to make your machine inoperative with improper setting values.
$0=29 (step pulse, usec)
$1=255 (step idle delay, msec)
$2=0 (step port invert mask:xxxxxxxx)
$3=2 (dir port invert mask:xxxxxxxx)
$4=0 (step enable invert, bool)
$5=0 (limit pins invert, bool)
$6=0 (probe pin invert, bool)
$10=0 (status report mask:xxxxxxxx)
$11=0.005 (junction deviation, mm)
$12=0.002 (arc tolerance, mm)
$13=1 (report inches, bool)
$20=1 (soft limits, bool)
$21=0 (hard limits, bool)
$22=1 (homing cycle, bool)
$23=3 (homing dir invert mask:xxxxxxxx)
$24=50.000 (homing feed, mm/min)
$25=2000.000 (homing seek, mm/min)
$26=250 (homing debounce, msec)
$27=1.000 (homing pull-off, mm)
$30=1000 (rpm max)
$31=0 (rpm min)
$32=1 (laser mode, bool)
$100=810.000 (x, step/mm)
$101=810.000 (y, step/mm)
$102=810.000 (z, step/mm)
$110=2000.000 (x max rate, mm/min)
$111=2000.000 (y max rate, mm/min)
$112=2000.000 (z max rate, mm/min)
$120=100.000 (x accel, mm/sec^2)
$121=50.000 (y accel, mm/sec^2)
$122=50.000 (z accel, mm/sec^2)
$130=171.450 (x max travel, mm)
$131=90.000 (y max travel, mm)
$132=40.000 (z max travel, mm)

Now, as mentioned, the settings to affect what you describe can be found in VCarve when you click the "Select" button to choose a tool bit. The value that controls the Z axis lowering is called the "Plunge Rate." You change this value appropriately to increase or decrease the Z axis speed. Be careful increasing the plunge rate higher than the default values until you have more experience with your machine to avoid tool bit breakage.
VCarve Tool.jpg
VCarve Tool.jpg (117.96 KiB) Viewed 2623 times

Re: New to GRLB need guidance

Posted: Wed Dec 04, 2019 8:04 pm
by davet354tfd
OK. Thanks for the info.
I didn't know if this was a Picsender or Vcarve thing I needed to look at.
I will see what the settings are in Vcarve and go from there.



Re: New to GRLB need guidance

Posted: Wed Dec 04, 2019 8:07 pm
by davet354tfd
The GRBL settings are specific to machine. The ones I have will be specific to an X-Carve. But they will differ from another manufacturers machine?

Re: New to GRLB need guidance

Posted: Thu Dec 05, 2019 4:17 am
by Picengraver
Bob, that is correct. Some of the grbl settings might be changed to improve machine operation a little, and some may need to be changed to calibrate the distance movements of the axes. This should help with your understanding of grbl. Some of this will be confusing, I know, but with time and experience it will become more clear. ... figuration

EDIT: Be sure to save a copy of your original settings in a file (even print out a copy) so should they become corrupted for any reason, or changed in error, you can revert back to the original settings. To save your settings, click on the yellow GRBL button at the top of the main PicSender screen, and the screen will open with your current settings displayed on the left side of the screen. Click the Save button follow the prompts, but give the file a different name than the recommended name. You can also click on the Edit button, and your default text editor (Notepad?) will open up with the settings displayed. You can then print out the settings for safe keeping.