Dynamic & Optirough Back-Feed Clipping Part

[Walid Naim]

Hi All,

I'm having issues with the tool slightly clipping the part in the back-feed motion when high-speed roughing using either dynamic or optirough in mastercam.  The machine I'm using is Matsuura MX-520 5-Axis.  Is this a setting that I'm missing in Mastercam or some parameter or setting in the machine itself?

[crazy^millman]

Seen it many times. Try adjusting the Linking parameters until you get enough in there to correct it. You would think these toolpaths wouldn't clip corners when roughing in themselves, but yes I have seen it in Mastercam's verify and like you clipping corners from time to time. Are you using CAMPLETE? Make sure you enable the arc setting in there to get smaller code to run on your machines. I prefer to run them that way over the point to point that CAMPLETE seems to default to for me.

[Walid Naim]

The problem is that it doesn't show in Mastercam simulator.  I only see it afterwards on the actual part.  Im using Camplete? can you be more specific about the arc setting ? 

[AMCNitro]

I've seen this problem in older Haas machines, you have to slow down the backfeed, the machine cant keep up.  We have an older Mini Mill here and 2 newer machines.  I never program more than 250ipm backfeed on the Mini mill.  

[Leon82]

Put g131 on. You can use p2 for roughing.

I use 500 and 1000 ipm backfeeds and they run fine on our mx machines

[crazy^millman]

4 hours ago, Walid Naim said:

The problem is that it doesn't show in Mastercam simulator.  I only see it afterwards on the actual part.  Im using Camplete? can you be more specific about the arc setting ? 

Do this:

3 hours ago, Leon82 said:

Put g131 on. You can use p2 for roughing.

I use 500 and 1000 ipm backfeeds and they run fine on our mx machines

Your not using the Accel and Deccel settings to control the movements when roughing. You cannot bank a car and 1000mph and it is not different for a machine tool. They will try, but they loose accuracy when doing so just the Physics of things. I don't have my CAMPLETE to open it up, but reach out to them they are great and can help you tweak your CAMPLETE to avoid these types of issues.

[Walid Naim]

Thanks everyone for your help.  

[AMCNitro]

On 9/11/2020 at 9:02 AM, Leon82 said:

Put g131 on. You can use p2 for roughing.

I use 500 and 1000 ipm backfeeds and they run fine on our mx machines

Good to know!