Degression in Mastercam Software or some setting needs adjusting?

[Here's Johnny!]

Hi,

I have a small impeller I designed and modeled in Mastercam.

In Mastercam 2019 there is a "Roughing" multi axis toolpath. It was upgraded or replaced by "Pocketing".

I can create the Roughing toolpath in MC2019 with ease and the path looks great. If I open it in MC2021 or MC2023 it still looks great. If you change anything like a feed rate in MC2021 or MC2023 it will never regenerate properly again. It does regenerate better in MC2023 than in MC2021 but neither would work. I tried adjusting the the roughing min ramp length as Ron showed with another file he helped me with but no change in the results.

I have sent it into QC but I doubt they will look at it. Here is a link to my dropbox of the comparison photo.

https://www.dropbox.com/s/tjucyzdhk8krrhz/Comparison.jpg?dl=0

I am an educational user so my file extensions are .emcam

[TSmcam]

What makes you think QC wont look at it?

[Here's Johnny!]

What makes you think QC wont look at it?

Me I am small potatoes!!!

[CNCAppsJames]

They LOOK at everything.

[gcode]

I wonder if it would still have the same issues in the industrial version.
Someone with a dealer's sim could give is a whirl in industrial MC2003 Update 4
I was once told that getting past versions to open in new versions properly was
the Prime Directive.

[Here's Johnny!]

I was once told that getting past versions to open in new versions properly was
the Prime Directive.

It opens fine in the newer versions but you can't make any changes to that toolpath.

If you change one thing in MC2021 such as a feedrate it dirties the path and if you regenerate it the toolpath is shit!

I posted it on the Main Mastercam forum and still waiting to hear from QC....crickets!!

[gcode]

I posted it on the Main Mastercam forum and still waiting to hear from QC....crickets!!

send it to [email protected] also

[Here's Johnny!]

[email protected] also

That is where I initially emailed it on Monday.

[Dylan Gondyke]

I posted a reply over to your question on the Mastercam forums, but just to also post it here for anyone looking:

Pocketing uses stock a bit differently than it did in Mastercam 2019. Your stock selection in this file is just faces, rather than a watertight body, so there is no volume for Pocketing to utilize to determine the proper depth to machine to. If you instead select the entire impeller body blank for stock, you'll get the result you're expecting in newer versions of Mastercam.

Your QC emails don't just disappear- it's just a busy time for testing and a high email workload.

[Here's Johnny!]

I posted a reply over to your question on the Mastercam forums, but just to also post it here for anyone looking:

Pocketing uses stock a bit differently than it did in Mastercam 2019. Your stock selection in this file is just faces, rather than a watertight body, so there is no volume for Pocketing to utilize to determine the proper depth to machine to. If you instead select the entire impeller body blank for stock, you'll get the result you're expecting in newer versions of Mastercam.

Your QC emails don't just disappear- it's just a busy time for testing and a high email workload.

Just saw your post on the Mastercam Forum! Many thanks for pointing me in the right direction!!!! Your method works in MC2023 but not in MC2021. Possibly a setting in the toolpath?

[Dylan Gondyke]

Just saw your post on the Mastercam Forum! Many thanks for pointing me in the right direction!!!! Your method works in MC2023 but not in MC2021. Possibly a setting in the toolpath?

Possibly. I asked Matt (QC) to look into it a little further. Right off the bat I know that roughing toolpaths with floors that wrap 360 degrees, like you have here, have received a lot of behavioral changes over the last few years to accommodate different scenarios. You might not be able to get 2021 to exactly mimic 2019. I don't have 2021 installed right now to even check.

[Here's Johnny!]

Hi Dylan,

As always I appreciate everyone that helps me become better with Mastercam!!!!!

Thank you!

John

[Dylan Gondyke]

No problem, happy to help

[CNCAppsJames]

Your QC emails don't just disappear- it's just a busy time for testing and a high email workload.

Forgot... Beta cycle is hot and heavy now... 🍻

[Here's Johnny!]

Your QC emails don't just disappear

All good machinists have a bottom drawer in the toolbox to put (hide) unwanted (scrapped parts)....CNC Software must have bottom drawer....!!!!!!!