Negative value for toolpath time

[So not a Guru]

I have a file, 38 ops & 4 stock models. The last 4 ops each are returning "-596523:-14:-08", as the toolpath time. Backplot, verify & setup sheets are all returning this value. I tried shutting down my PC & restarting, no joy.

We use MC's time calculations as a rough measure for scheduling here, as you can imagine, this throws a bit of a wrinkle in that process. Has anyone else run into this?

[David Colin]

Backplot time is not really reliable. I usually have issues as i'm using compensation in control...

[So not a Guru]

Backplot time is not really reliable. I usually have issues as i'm using compensation in control...

I am aware of that. As I said we only use the times as (very) rough estimates.

This issue, however, goes wayyy beyond the usual margin of error.

[G Zero]

If all you need is the time. Take the path length for each op and use the feed rate to calculate an estimate. I have never had a negative backplot time but the last time backplot went all funky on me I had a back feed rate set to .1 so take a close look at your code. 

[?Mark]

Looks like you passed the speed of light on this toolpath, slow down a little 

 

Weird, never seen anything like it, lol

[So not a Guru]

If all you need is the time. Take the path length for each op and use the feed rate to calculate an estimate. I have never had a negative backplot time but the last time backplot went all funky on me I had a back feed rate set to .1 so take a close look at your code. 

Aha! That was it, somehow I checked the "override feed rate" box in the lead out section & it had a default value of 0. Thanks man, that was driving me nuts (of course, it's a short enough trip, that I could walk there).