# Thread: find center point of circle

1. ## find center point of circle

hello
i have a question.In G02 and G03 if we have R value and need to find the point of circle.what do we do? i saw a formul in this site but it did not work correctly

2. hello
in Gcode (G02 and G03) how do i do when i do not have I and J value?

3. you can find sites that teach math with a Google search

4. thank you
but i explain that i searched and studid many days but i can not find a correct result.if you know site please tell me

5. Machine Shop Info

This guy offers good video tutorial, really helpful.

Jeff

Here is a link to a web site that has the information that you seek.

Equation of a circle in standard form. How to express a circle with given radius in standard form...

I hope that this is what you are looking for.

7. Originally Posted by ger21

thank you
but this formul is not correct. It did not calculate center point correctly.I tested
many foumul but all of them were wrong.

8. Originally Posted by Medm
Here is a link to a web site that has the information that you seek.

Equation of a circle in standard form. How to express a circle with given radius in standard form...

I hope that this is what you are looking for.
thank you
but this address is error.I can not see this site.could you that formul mail me?

9. After you make a circle using R-method, why do you need its center. Pl explain.
I can work out the formula for you, but why devote time on something not very important!

10. Originally Posted by sinha_nsit
After you make a circle using R-method, why do you need its center. Pl explain.
I can work out the formula for you, but why devote time on something not very important!
hello and thanks
what do we need for draw a circle?R and center coordinate.so I need to know what is center points.you tell me G02 or G03 draw circle but where does draw it?start point end point Radius and center points are need.if I thinking wrong please guide me.
sorry my english is weak so I wrote sth wrong.

11. You need to specify either R or IJK, not both.
If you specify both, the control uses R-method, ignoring IJK.
Positive R produces minor arc (which is relevant in most cases), and negative R produces major arc.
The manual does not recommend R-method when the chord angle is close to 180 degree.

Page 1 of 2 12 Last