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atrueresistance
1118 Views, 3 Replies

Time Estimation off

The time estimation in F360 does not appear to be correct.

 

http://imgur.com/a/EXDTT

 

The speeds/feeds are in one imgur photo. F360 estimated 30 minutes, and the job finished with a time of 1hrs and 42 minutes. The bit was from kodiakcuttingtools.com 1/16 SF 4FI

 

The cycle time estimates in Fusion (and all of our Autodesk CAM tools) are based on simple formulas that take into account cutting path distance and speeds and feeds. Depending on the machine, tool change time, rapid speeds, etc. the values can vary, but typically not by more than 10% (in my experience.)

 

Most of my own experiences have been on Haas, Fadal, and DMG machines; all very close to the estimated cycle times (<5% +/-).

 

The results you got are significantly off so we'll definitely take a look to make sure that nothing changed inside the software that could cause such a discrepency. Then we'll try to dig into your machine config and see what might be the cause of such a difference.

 

Thanks for posting.

 

Anthony Graves

Product Manager, CAM

fonsecr
in reply to: atrueresistance

I suspect the extra time might be due to overhead in the serial transfer time (you are drip feeding). If your CNC supports uploading the entire NC program directly before starting it you can try this and see what the machining time is without the IO. In your picture you only show 2D pocket operations so I dont think that the extra time is due to the CNC not being able to keep up with the programmed feeds as long as they are relalistic.

 


René Fonseca
Software Architect

anthony.graves
in reply to: fonsecr

Good catch Rene. Rene is correct about how the serial transfer could be a bottleneck, if you are not able to load the entire file into the control. Otherwise, we'll need to look into this further.

 

Anthony