More often than not you will need to do quite a number of passes. Under Maximum Roughing Step Down, you will set how deep each pass will cut until reaching the final destination.

Multiple Depths: Always enable this for every operation you can, it is disabled by default.

The lower the number, the longer it will take to cut, but the less the CNC will struggle and the better it will look It’s a tradeoff.

Maximum Stepover: This should be no larger than 90% the diameter of the bit you are using, more likely much less.

In the 4th tab, shown to the right, you have settings that dictate quite a lot of different options, but it’s easier of to thing of this tab as handling primarily the depth of cut, stopover, sideways compensation and stock to leave: Generally for Lead-In/Lead-Out, 10-30% slower is a good setting to test at, and 30-50% slower for Plunge/Ramp feedrate. These should always be lower than your cutting feedrate.

Lead/Ramp/Plunge Feedrate: These settings dictate cutting feedrate through various more stressful movements your machine might make.

The deeper you cut, the slower you have to set this. This value varies wildly depending on how deep you are cutting per pass.

Cutting Feedrate: This is the primary value used to dictate how fast your CNC tries to slice through your project.

Anything over that $30 value just defaults to Max Speed. So 1000 = Max speed and 500 = half speed. As one might expect, this setting dictates how fast your spindle will turn, but setting it to 1000 does not equate to 1000 RPM, but rather is relative to the $30 value in your GRBL settings. Spindle Speed & Ramp Spindle Speed: For the sake of simplicity, make a habit of setting both of these settings equal to one another.There are a lot of features you can modify, enable or disable but for the sake of this quickstart guide we will focus on the essentials: In the first tab, after you have selected your end mill, you will need to alter all of the feeds and speeds settings based on a variety of factors.

Cnc 3018 grbl settings