[Robert Timby]

I am having a problems with my lathe, it seems that i can not get the feed rate right using a g93. i'm cutting a simple d groove on the part using a t-cutter. My problem is, that the spindle will fly when i don't have a x move with the c axis in the same line. And when i do have them in the same lines the cut looks like it is jagged. Can anyone out there can help? Please!!!

thanks

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Rob Timby
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[CNCRim]

Post your program we might see something.

[Robert Timby]

newtexas2006,

Here is the program i'm using in the lathe to mill the groove, any ideas?


(PGM, RAYGROOVE DATE 29-01-07 TIME 16:29)
:G0G62G70G97S76M3G95F.003T2M26X10.Z10.
(MSG, TOOL - 2 OFFSET - 0)
(MSG, 1-1/4 SLOT ENDMILL)
G0X10.Z10.
M21
G0X0.Z1.
C0.
G94G97S500M13F3.
X1.3559Z.1
G93G1Z-.85
C-24.804F2000.
X1.3957F3.
X1.4469C-19.868F3.72
X1.5085C-15.267F3.44
X1.5719C-11.437F3.17
X1.6419C-7.921F2.91
X1.6652C-6.716F2.88
X1.6846C-5.448F3.03
X1.7C-4.13F3.15
X1.711C-2.774F3.24
X1.7177C-1.393F3.3
X1.7199C0.F3.33
X1.7255C4.623
X1.7423C9.191F3.28
X1.77C13.655F3.2
X1.8083C17.973F3.08
X1.8418C20.95F2.96
X1.8801C23.815F2.85
X1.8856C24.278
X1.8889C24.757F2.97
X1.89C25.244F3.03
X1.8899C154.756
X1.8888C155.243
X1.8854C155.721F2.97
X1.88C156.182F2.86
X1.8271C160.271
X1.7844C164.545F3.02
X1.7523C168.975F3.15
X1.731C173.521F3.25
X1.7209C178.135F3.31
X1.722C182.766F3.33
X1.7343C187.362F3.3
X1.7576C191.873F3.24
X1.7916C196.254F3.13
X1.8319C200.127F3.
X1.8801C203.815F2.86
X1.8856C204.278
X1.8889C204.757F2.97
X1.89C205.244F3.03
X1.8899C334.756
X1.8888C335.243
X1.8854C335.721F2.97
X1.88C336.182F2.86
X1.8272C340.271
X1.7845C344.546F3.02
X1.7523C348.976F3.15
X1.7311C353.521F3.25
X1.7228C356.751F3.31
X1.72C360.F3.33
X1.7245C364.157
X1.7381C368.27F3.29
X1.7419C369.643
X1.7412C371.02
X1.7361C372.389F3.27
X1.7265C373.737F3.22
X1.7126C375.053F3.14
X1.6946C376.323F3.03
X1.6326C380.594F3.08
X1.5809C385.132F3.3
X1.5399C389.906F3.5
X1.5143C394.069F3.66
X1.4968C398.356F3.76
G0Z1.
G0X10.Z10.C0.
M20
G12
M0
M02
%

Thanks for the help

[CNCRim]

I think G93 make your machine move funny. If I remember it right G93 is feed degree per minute. And if you look at the program line by line on Cxx.xxxx the degree is increment unevenly, and I think that is why the machine move the way it does.

Why don't you use G12.1 and use feed per minute(G98).

[Robert Timby]

newtexas2006,

I dont understand what you mean by increment unevenly on the c. I know the machine reads not degrees per min but in seconds per min. The guys at cin gave me an equstion time= distance(60)/fpm. This is what i had my post post out using a g93. I will try a g98 and a g12.1 tomorrow when i come in

Thanks

rob