from our friends at Tormach
There are two ways to program G02 and G03 arcs, radius format and center format. The syntax is as follows:
G02 X_ Y_ Z_ A_ R_ (for radius format)
G02 X_ Y_ Z_ A_ I_ J_ (for center format).
While radius format can be convenient for programming, it’s really not suitable for some of the most commonly hand-coded shapes, namely full circles and semi-circles. Because the center point is not explicitly programmed, but rather calculated from the given radius, a small rounding error in the arc end point will have a magnified effect on the position of the center point of the arc, effectively ensuring your circles and semi-circles will be out-of-round. For these cases, programming in center format is the only way to go.
Please do us a tremendous favor and forward this e-mail to your machining friends!
Please do us a tremendous favor and forward this e-mail on to your machining friends!
Are you not a subscriber to DIGITAL MACHINIST? Visit us at www.digitalmachinist.net and request a no-obligation issue, or call and request it at 1-800-447-7367. Tell them you received an e-mail from a friend!
Your friend thinks you’ll enjoy DM, or you wouldn’t have this e-mail!
We hope you enjoyed this e-mail tip, brought to you by your friends at Digital Machinist.
Do you enjoy our e-mail tips? Has one of them ever “knocked something loose” in your head? Your tip could be a future e-mail blast from your favorite magazine. Just send your tips to george.bulliss@VPDemandCreation.com. If we use your tip, we will extend your subscription by an issue. We like to see 200 to 300 words, plus an image, if available. Thanks!