Inverse time only posts minimum feedrate

[Matt Berube at Ferron Mold]

Greetings fellow Mastercammers,

I have an MP Master post which I muddled my way through setting up myself for our Makino A-61 with Pro6 control.   It works great for everything we've done so far but now that I'm needing to mill with the B axis, I'm forced to learn about inverse time feedrates...

I have a couple concerns at the moment:

1.  The G93 feedrates post out at the minimum.  Mastercam posts whatever I set  the "inverse time feed rate limits" (minimum)  to.  In the snippet below, my inch Inverse Time Feedrate Limit was set at 333 minutes.  

%
O0010 (KK2626 SLEEVE MILLING)
(MAKINO A-61)
(MACHINE GROUP-1)
(MCX FILE  - S:\MCX\KK2626\KK2626 SLEEVE MILLING-TEST.MCAM)
(PROGRAM   - KK2626 SLEEVE MILLING.NC)
(DATE      - AUG-20-2018)
(TIME      - 8:39 AM)
(T41  -    .0625 CARB MILL   - H41  - D41  - D0.0625")
N100 G00 G17 G20 G40 G80 G90
N110 G91 G28 Z0.
N120 (COMPENSATION TYPE - COMPUTER)
N130 T41 M06 (   .0625 CARB MILL)
N140 M11 (UNLOCK)
N150 G00 G17 G90 G54 B30. X0. Y-3.2337 S10000 M03
N160 G43 H1 Z1.2188
N170 M08
N180 Z.6188
N190 G94 G01 Z.2188 F3.
N200 G93 X-.0039 Z.2187 B31.555 F333.
N210 X-.008 B33.182 F333.
N220 X-.0123 B34.884 F333.
N230 X-.0167 B36.664 F333.
N240 X-.0214 B38.524 F333.
N250 X-.0262 B40.466 F333.
N260 X-.0312 B42.497 F333.
N270 X-.0313 Y-3.231 B42.5 F333.
N280 G94 Y-3.228 F20.
N290 Y-3.2248
N300 Y-3.2212
N310 Y-3.2172
N320 Y-3.2129
N330 Y-3.2082
N340 Y-3.203
N350 Y-3.1973
N360 Y-3.1911
N370 Y-3.1842
N380 Y-3.1767
N390 Y-3.1685
N400 Y-3.1595
N410 Y-3.1496
N420 Y-3.1388

2.  See in pic below where "use inverse" is specified in every place possible. 

I can't understand why with the selections made below, the NC file still switches back and forth between G93 and G94.  

In my "Swarf Milling" operation, the feedrates for the tool are set to "Plunge = 3.0, Feed 20.0, Retract 20.0"

 

If somebody could point me in the correct direction I'd appreciate it 

 

 

  

 

 

[Matt Berube at Ferron Mold]

Still experimenting...  Changed the "minimum inverse feed rate" to 20,000 minutes...

Now the post is no longer hitting the minimum feed rate limit but why are the feedrate numbers so large?

%
O0010 (KK2626 SLEEVE MILLING)
(MAKINO A-61)
(MACHINE GROUP-1)
(MCX FILE  - S:\MCX\KK2626\KK2626 SLEEVE MILLING.MCAM)
(PROGRAM   - KK2626 SLEEVE MILLING.NC)
(DATE      - AUG-20-2018)
(TIME      - 9:15 AM)
(T41  -    .0625 CARB MILL   - H41  - D41  - D0.0625")
N100 G00 G17 G20 G40 G80 G90
N110 G91 G28 Z0.
N120 (COMPENSATION TYPE - COMPUTER)
N130 T41 M06 (   .0625 CARB MILL)
N140 M11 (UNLOCK)
N150 G00 G17 G90 G54 B30. X0. Y-3.2337 S10000 M03
N160 G43 H1 Z1.2188
N170 M08
N180 Z.6188
N190 G94 G01 Z.2188 F3.
N200 G93 X-.0039 Z.2187 B31.555 F9850.9
N210 X-.008 B33.182 F9374.62
N220 X-.0123 B34.884 F8886.34
N230 X-.0167 B36.664 F8386.92
N240 X-.0214 B38.524 F7874.14
N250 X-.0262 B40.466 F7409.03
N260 X-.0312 B42.497 F6810.91
N270 X-.0313 Y-3.231 B42.5 F7344.41
N280 G94 Y-3.228 F20.
N290 Y-3.2248
N300 Y-3.2212
N310 Y-3.2172

 

[David Colin]

Because values are calculated like that:

F(code) = 1 / (time = 3D distance/linear feedrate) 

With multiaxis toolpaths, distance between 2 points is usually very small, so time to move between these 2 points is small too.

Logically: 1 / (small number) = big value

 

 

[lowcountrycamo]

I use inverse daily and those numbers do not look unusual.  Although it is hard to say as f1000. is a different velocity whether moving 10." or .1"

[Matt Berube at Ferron Mold]

Thanks guys, I am now calling Makino to figure out whether something needs to be unlocked in the control.

[shazam/TPP]

probably your G93 code. MDI that and see if you receive an error