Struggling with feed rates although possibly a Mach3 issue

[matt_petrie]

Hi, i'm trying to speed up one of my g-code files, so i've adjusted the cutting feedrate, and lead in/out feedrates etc, however when the cutter finishes one operation and moves across the X and Y to position for another cutting operation it is moving at 3000metres per minute. I can't see an option on F360 to change this feedrate. When I open the g-code file and search for F3000, there is nothing, therefore possibly it's a default on mach3 that I ought to change? Any help appreciated, also I altered the cutting feed rate from 8m per minute to 9, however the file run time on the program remained the same. Mach 3 show's it correctly, however is this an issue with my cnc or has anyone else experienced similar issues

Apologies if I'm in the wrong place and should be submitting this to a mach3 forum

[seth.madore]

If you are using a Personal License, this is expected behavior. Earlier last year (it may have been longer, I've lost track) we changed some aspects of Personal Use. One of those changes was that the rapid moves are replaced by cutting feedrate moves in most instances. 

[matt_petrie]

Hi, thanks for the reply, however the cutting feedrate is 9mpm and it's doing the rapid move at 3mpm

[matt_petrie]

argh ok, think i just need to fiddle with the linking parameters

https://www.autodesk.com/products/fusion-360/blog/high-feed-rate-vs-rapid-feed-rate-explained/

so would that mean I need to select Always use high feed - and in doing so it would then run at the actual cutting feedrate?

[seth.madore]

No, linking feed is typically set in another field.

Two points;

1) Are you on a Personal or Commercial license?

2) Could you share the Fusion file that is doing this?
File > Export > Save to local folder, return to thread and attach the .f3d file in your reply

[matt_petrie]

Hi Seth, I have a fusion 360 - legacy membership with '1 seat'? and have done since 2018. 

[matt_petrie]

Hi, I've just tried to attach the .tap file however it's not allowed on here???

[seth.madore]

Rename the .tap to .nc or .txt

That said, I'd actually like to see your Fusion file, not the resulting g-code (although it doesn't hurt to see that as well.

File > Export > Save to local folder, return to thread and attach the .f3d file in your reply.

Are you using the generic Mach 3 post processor, or is it one that you've saved locally?

[jamesT47WA]

You can't find F3000 because G00 (rapid maneuver) does not have an F in front of the rate. So it would be G00Z1.0 and not G00F3000Z1.0

[matt_petrie]

Hi, i'm so sorry that i've taken ages to come back to you - been dealing with a few things. I have now attached the .txt file as well as the actual fusion file

[seth.madore]

When you command a G0 X10. (or other large value) move, what is the feedrate? Looking at the backplot code, it's certainly doing a G00 move:

 Is it possible that your machine is set to have max rapid at that feedrate?

[matt_petrie]

Hi Seth. many thanks for coming back to me. That seems to be when it is travelling at that speed. I will try and find where in mach3 those rates are set up - thank you

[matt_petrie]

Hi Seth, just coming back to you on that, so should I be altering the rapid speed max in mach3 (not sure where this setting is) or should I be setting up the machine in the F360 machine library and setting a max rate? - Basically it's moving at 3000 mm p m but I would like to increase this

[seth.madore · Accepted solution]

You could change your High Feed settings to a large feedrate, but not all toolpaths have that option, nor is the post processor configured to use only High Feedrate. Personally, I'd be looking into Mach3 to find that rapid feedrate settings.

[matt_petrie]

Hi Seth, much appreciated, i'll have a look at altering the settings on mach3. I appreciate your help on this. I'll close the ticket.