G70 circular hole problem

Spruewell · Aug 11, 2020

I took a program that I have been running on my old (1992) VF2 and loaded it into my new (2016) VF3. In the program, there is a G70 command I use to create a circular hole pattern. The machine keeps throwing an X axis over travel alarm when it gets to that command. I’ve compared it with the example in the book and can’t find what’s causing the problem.

T4 M06;
G00 G90 G154 P16 X0. Y0. S5000 M03;
G43 H04 Z.1 M08;
G81 G98 Z-.54 R.1 F10. L0;
G70 I1.075 J0. L18;
G00 G80 Z1. M09
G28 G91 Z0;
G28 Y0.;
M01;

Booze Daily · Aug 11, 2020

I have an older control, but according to the Operation Manual G70-G72 appears to need Setting 33 set to Yasnac.

Be aware that setting to Yasnac affects how the control handles G52 if you use that.

Spruewell · Aug 11, 2020

Thanks, I’ll take a look at that. Doesn’t that setting also affect cutter comp.?

Booze Daily · Aug 11, 2020

Not according to the manual. The only other things affected are G92 and G12/G13 circular pocket milling.

kinetiq · Aug 11, 2020

Your code ran fine on my '13 VF2. Chances are wherever your G154 P16 work offset is, the circular pattern puts part of it outside the travels of the machine. Graphics preview on the machine should give an indication of this.

Spruewell · Aug 11, 2020

It’s pretty close to nowhere near the limits of travel for the machine. A quick check of the settings showed that both of my machines are set to FANUC. I had to cam the hole pattern to get things going, but I still want to get the canned cycle functioning. It is way more flexible to be able to edit the pattern at the control, rather than having to completely re-draw the part, generate tool paths, post, and send it to the machine every time.

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