Need Help!- Invalid R in G0

[yz426four]

please help if you can, was running Haas VF2 machine fine, now every MasterCam program that I up load gives me the " Invalid R in G0 " message, what changed? and how do I fix it. thank you so much!!! dean

[dcoupar]

Could you tell us the exact alarm number?

I don't find any reference to "Invalid R in G0". I found "Invalid R in G02 or G03". If this is the alarm, the R value may be too small. It has to be > or = 1/2 the distance between the start and end points of the arc.

Another possibility is you're not getting a G0 or G1 output after a circular move.

[yz426four]

I have been poking around with the machine and the MasterCam program for a while today, I noticed that all my offsets, ( G54 and TLO's ) have to be changed to get the machine to run,do you know what would cause this? I think MasterCam is doing it but I don't know why or how. thanks for any input and help. dean

[extanker59]

Maybe MasterCam was posting to the centerline of the tool then a setting was changed and it's now posting to the tool radius line?

[Donkey Hotey]

Are you trying to do cutter compensation in the Control rather than Computer? If you're trying to cut a .25" pocket radius and the cutter radius is greater than .25, I think it coughs out that error. Make sure that the cutter radius and wear values add up to less than the arc you're trying to cut.

[littlerobb]

If you are using M.C. X or newer there should be a Haas post processor that will not output "R" values, it will be "I" and "J" values, I would start there, but it doesn't make sense to me why you would get invalid "R" in a rapid move?



Greg I think you can stop calling yourself CNC nOOb, I give you permission, Robert

[yz426four]

Thanks for the help gentlemen, I really appreciate that you took the time to help a struggling noob. dean

[Donkey Hotey]

Originally Posted by littlerobb If you are using M.C. X or newer there should be a Haas post processor that will not output "R" values, it will be "I" and "J" values, I would start there, but it doesn't make sense to me why you would get invalid "R" in a rapid move?

I couldn't find my post to reference the problem but I shared a story about this and answered somebody else's problem that was similar. In my case, the output was choking on helical entries into pockets. I was having a problem with 360 degree arc moves and was trying to correct it with a change to the post.

What I discovered is that in MCX and later, there is a setting within Mastercam that controls how it outputs Arc moves to the post. I had to tell it to break arcs every 180 degrees. That's also where you get the choice for IJ or R type arcs. The post handled both but depended on Mastercam to decide which get passed to it. This was the other thing I was going to suggest looking at, but I'd check the actual cutter radius and programmed geometry first.

Originally Posted by littlerobb Greg I think you can stop calling yourself CNC nOOb, I give you permission, Robert

Thanks, Robert, but compared to some of the guys on here, I will always be a nOOb.