c-axis in Lathe milling is super slow!!!!!! Inverse time??

[Mickey@acceltool]

When I program C-axis milling on my lathe any linear moves are at commanded feed rate but when the C axis moves it is super slow.

I am guessing it is an inverse feed rate thing. I don't know enough about that or how to get it to work correctly!

 

Can anybody help me with this?

 

Here is an example of the code:

 

%
O0001
(PROGRAM NAME - 3)
G20
G0 G20 G80 G40 G18 G99

N53
(TOOL - 53 OFFSET - 53)
(1/4 CARBIDE ENDMILL )
G40
N53 G0 T5353
M35
G97 S4584 M3 P12
G18 G98
G0 C0.
G0 X2.125 Z3.2233
M8
G18 H0. W0.
G07.1
G1 X1.325 C89.3732 F500.
X1.025 F20.
G42 Z3.0755 C86.7208 F27.5
G2 Z3.0625 C86.6007 R.0749
G1 Z2.5933 C86.6071
Z2.5924 C86.6102
Z2.5916 C86.6162
Z2.5907 C86.6253
Z2.5898 C86.6376
Z2.5889 C86.6539
Z2.588 C86.6729
Z2.5871 C86.6957
Z2.5862 C86.7228
Z2.5853 C86.7541
Z2.5843 C86.7891
Z2.5834 C86.8269
Z2.5824 C86.87
Z2.5815 C86.9174
Z2.5805 C86.9691
Z2.5795 C87.0253
Z2.5786 C87.0863
Z2.5776 C87.1532
Z2.5766 C87.2249
Z2.5757 C87.2988
Z2.5747 C87.3761
Z2.5738 C87.458
Z2.5729 C87.547
Z2.5721 C87.635
Z2.5712 C87.7291
Z2.5704 C87.8302
Z2.5696 C87.9347
Z2.5688 C88.0389
Z2.5682 C88.139
Z2.5675 C88.2481
Z2.5669 C88.3553
Z2.5663 C88.4623
Z2.5658 C88.5707
Z2.5653 C88.6836
Z2.5648 C88.7915
Z2.5644 C88.9019
Z2.564 C89.0176
Z2.5637 C89.1346
Z2.5634 C89.2486
Z2.5632 C89.3543
Z2.563 C89.4674
Z2.5628 C89.5776
Z2.5627 C89.6855
Z2.5626 C89.7934
Z2.5625 C89.9032
C90.0177
C90.1299
Z2.5626 C90.2388
Z2.5627 C90.3465
Z2.5628 C90.4551
Z2.563 C90.5676
Z2.5632 C90.678
Z2.5635 C90.7888
Z2.5638 C90.9021
Z2.5641 C91.0163
Z2.5645 C91.1293
Z2.5649 C91.2386
Z2.5654 C91.3505
Z2.5659 C91.4613
Z2.5665 C91.5708
Z2.5671 C91.6794
Z2.5677 C91.7871
Z2.5684 C91.896
Z2.5691 C92.0016
Z2.5699 C92.1022
Z2.5706 C92.1994
Z2.5714 C92.2947
Z2.5723 C92.3903
Z2.5732 C92.4766
Z2.5741 C92.5632
Z2.575 C92.6484
Z2.576 C92.7292
Z2.577 C92.8023
Z2.5779 C92.8692
Z2.5789 C92.9345
Z2.5798 C92.9933
Z2.5808 C93.047
Z2.5817 C93.0966
Z2.5827 C93.1436
Z2.5836 C93.1835
Z2.5846 C93.2205
Z2.5855 C93.2552
Z2.5865 C93.2861
Z2.5874 C93.3124
Z2.5883 C93.333
Z2.5892 C93.3515
Z2.5901 C93.3664
Z2.591 C93.3777
Z2.5918 C93.3858
Z2.5927 C93.391
Z2.5944 C93.3952
Z3.0625
G2 Z3.0755 C93.2826 R.075
G1 G40 Z3.2232 C90.626
X2.125 F500.
G07.1 C0.
M9
G28 U0. H0.
G53 B0
G28 W0.
M5 P12
M34
M30
%
 

 

[JoshC]

you could try the g12.1 or g112 face milling mode. its typically on the misc values page of the toolpath.

​

Just an idea but it may work for you.

[Mickey@acceltool]

I use that on face milling with great sucess!!!   My problem is when I do c-axis milling is where I have an issue..

 

Like on the tube side!

[JoshC]

Oh I see. I am just guessing now, but see if this is the problem. go to settings machine definition --> edit the control definition. The go to the page shown in the image below and see if your federate is using maybe its in minutes instead of seconds or vice-versa. This change should increase it 60 times faster or slower depending how its currently set.

 

​

[Mickey@acceltool]

It is set to feedrate in min...

[JoshC]

well going to seconds should be 60 times faster if you want to try that.

[Mickey@acceltool]

just tried...didn't change a thing??

[JoshC]

Oh bummer, Depending on how the post is setup it may not be utilizing that option. The only other thing i guess i could suggest is seeing if you can get away from inverse time and using inches / min. if your really set on using inverse feed for accuracy or any other reason then I would suggest giving your Mastercam reseller a call. Typically the post dept at your reseller can find and fix problems like that pretty quickly.

[Müřlıń®]

Don't you have to turn on G93 in the post??

 

or is that just for mills?

[meshow_40]

Cylindrical milling should help you out if you are machining on the OD of the part.  I believe it is G107.  You can also calculate the federate (in the post) to switch to degrees per minute whenever a "C" axis move is called

[Mickey@acceltool]

Yeah!!! I'm gonna call my reseller but first I am trying to figure out if my Lathe/fanuc control has the option of G07.1 active then I will know more and be able to assist my reseller.

I know just enough to be dangerous...lol  and I scare myself!!!

[Mike@Dive Lab Inc.]

HAAS lathes have a setting in the control to enter the C axis diameter. That may be something to look at on your machine

[lathe guy]

in most fanuc mill turns (mori) that I have been around the feeds in any line with a c axis move command, feed was in degrees per minute, unless using something like G112