G Code 101: Circles and Arcs

Bob and Keith walk you through the process of creating g codes for making circles and arcs.

[jeffreycole]

This is one of the better descriptions for I and J in the G-Code that I have seen or read. It is not complicated, but how to describe the I and J apparently can be difficult for some to describe. I can actually now see two ways to indicate I and J, and for more complicated milling, I can now throw in the K values for milling.

Thanks for the description that we can understand.

[FF]

Total noob here. This video topped all the words I've read on the I and J thing. Thanks

[kalamity]

This video made the topic so easy to understand. I've been using g-code on and off for uni for the past 2 years. Have always struggled to understand how to get circles as you want them. You guys just helped me to ace my exam. Thank you!

[KechlimparisAthanasios]

Good work guys!!Very nice explanation of the G2, G3 functionality

[urquiza]

You can also use an r value with a g2 or g3 command to achieve an arc

[AmerikkkaGuitars]

Awesome explanation. Doing fret slots for multiscale guitar. Was confused about starting and end points, Also can generate curve with radius command. Will test but I think I'm heading in right direction. Also you can use camotics to import your gcode and will give a visual realtime representation of toolpaths and it's free.

[hambaallah]

Wow... clearer than my CNC lecturer.... subbed

[xpeace]

A superb video - getting to the point in lightning speed. Thank you very much.

[tora]

Thankyou! Very clear breakdown, appreciate it

[matthewchapman]

Great video! Thank You! I learned something.

[ProfessorVector]

Very nice just knowing X Y is the end point helped so much
I see people cut circles in two steps 180 degrees each is this necessary or can a 360 cut be done with one G2/G3 ?
This used to be so confusing because people want to start in the center of the circle and you also have to account for the bit size and subtract that out too. I have yet to see a formula using Xc Yc for center and Xbr Ybr (bit radius) !
Yes I'm a software engineer!

[kevincrum]

is there such a way to do an arc with all three axis? or at the least arching on a plane say YZ while moving X?

[stemoore]

On my machine I.. J.. is expressed as absolute by default. Is there a way to change this with code? I have tried G91.1 and adding D before the IJ but neither work. It has an ECS1801 control.

What about a spline? What way should we follow?

[celebrity_rooster]

Thanks for the video guys. Where can I do a circular motion in the Z axis?

[hussainbhavnagarwala]

How would you make a full circle, I tried using the same start point as end point but Nc viewer gives a weird output

[RafalGajdzik]

Last LINE SHOULD NO BE G2 X9 Y3 I3 J-3 ? (you missed "Y" )

[official_richielau]

This is great. Is there a way to form an arc that has a different that has a different x-radius from its y-radius like an ellipse?

[adilhassan]

I’m trying to curve a diagonal line to connect my initials, how would I go about doing that? Like how would I find the center point? I’m new to this G and M code. I want to connect the bottom corner of my M to the top corner of my H. My initials are AMH.

[roberthuerta]

most helpful video, clear and simple, no pussyfooting