Arc settings

[bogusmill]

In control def. on the arc page we have arc breaks at quadrants in all 3 planes. Is this how most of you set this up?

 

I know we used it because of problems our Bridgeport had using other settings and we just continued doing it out of habit. Any advantages to any of the other settings?

[Guest CNC Apps Guy 1]

I don't break arcs at all and I create them in all planes. Then again I'm programming for brand new Fanuc Controlled machines which makes things simple.

[CNCme]

Good day,

 

OG

I am having trouble with a new Fanuc 0ie control

on a vert. mill with NC code data of arcs with:

 

G3 X2.3465 Y2.3124 Ixxx jxxx

X2.3466 Yxxx Ixxx Jxxx

 

Note :

the X or Y value only changes .0001 or .0002

 

and the machine generates a full circle which

violates then part geometry. does not show in backplot or Cimco backplot.

I had to switch to "R" NC data

This happened about 5 times in 4 programs

anyone have this happen?

 

Tony G

CNCme Engineering

X Beta Site

SO Almost Employed Senior Programmer

N.E Massachusetts - Southern New Hampshire

_________________________________________

End mills and tooling are like The "AMMO"

And coolant and chips are like the enemy

Under your boots as you advance in the

Manufacturing Battle

-------------------------------------------------

[Matthew Hajicek - Singularity]

I always break arcs at 180°, since I never know which of several machines (some of which are antiques) they'll try to run the program on. It really doesn't add much code, so I figure it's a good safety thing.

[Matthew Hajicek - Singularity]

Tony, can you give us a couple examples with the real numbers?

[CNCme]

Good day,

 

That Break arcs applies on full arcs. The system can generate arcs smaller than 90 deg even with

breaks on.

 

 

Tony G

CNCme Engineering

X Beta Site

SO Almost Employed Senior Programmer

N.E Massachusetts - Southern New Hampshire

_________________________________________

End mills and tooling are like The "AMMO"

And coolant and chips are like the enemy

Under your boots as you advance in the

Manufacturing Battle

-------------------------------------------------

[Guest CNC Apps Guy 1]

TTBOMK I've not had any problems with arcs per se... I've had issues with machines not cutting circles but that was a servo issue...

[CNCme]

Good Day,

 

This is actual code that generated a full arc

on the machine

 

G2 X5.7756 Y-4.1933 I-.229 J-.1608

X5.7757 Y-4.1941 I-.2798 J0.

 

Tony G

CNCme Engineering

X Beta Site

SO Almost Employed Senior Programmer

N.E Massachusetts - Southern New Hampshire

_________________________________________

End mills and tooling are like The "AMMO"

And coolant and chips are like the enemy

Under your boots as you advance in the

Manufacturing Battle

-------------------------------------------------

[CNCme]

Good Day,

Longer ver. with G1 at both ends.

code shown at >

 

G1 X5.7815 Y-4.1801

G3 X5.7746 Y-4.2037 I.0372 J-.0236

X5.7753 Y-4.2113 I.0441 J0.

X5.7732 Y-4.2396 I.7054 J-.0645

X5.7892 Y-4.2529 I.0258 J.0148

X5.9656 Y-4.3258 I.1764 J.177

X6.2155 Y-4.0759 I0. J.2499

X6.1468 Y-3.9039 I-.2499 J0.

X5.9656 Y-3.8263 I-.1812 J-.1726

X5.7248 Y-4.0081 I0. J-.2502

X5.7181 Y-4.0203 I.0077 J-.0122

X5.7248 Y-4.0325 I.0144 J0.

 

> G2 X5.7756 Y-4.1933 I-.229 J-.1608

> X5.7757 Y-4.1941 I-.2798 J0.

 

G3 X5.8506 Y-4.2688 Z-.5107 I.0749 J.0002

G1 X5.8509

 

This toolpath is surface high speed horizontal

 

Tony G

CNCme Engineering

X Beta Site

SO Almost Employed Senior Programmer

N.E Massachusetts - Southern New Hampshire

_________________________________________

End mills and tooling are like The "AMMO"

And coolant and chips are like the enemy

Under your boots as you advance in the

Manufacturing Battle

-------------------------------------------------

[Matthew Hajicek - Singularity]

Tony,

 

It looks okay in my backplotter (NCPlot), but that arc is only .0008 long. I'm thinking that might be what caused the hiccup.