Machine broke my tap, then my threadmill, Arghhhh

[taperlength]

I had to use a far east clone of a 3-axis mill today.  No one here much uses it but was the only thing open to do a quick job.  So it did two good holes with a small tap but when it got to the third hole the tap snapped off when it reversed.   I figured the control needs a tune-up and went to look for a floating tap holder. No such luck.

I decided to change to a thread mill, a nice long .072 single point.  The tip snapped off in the first hole.  I re-ran it without the tool and noticed the cutter comp was not happening. It comped like the offset was zero.  I looked at the g-code and it has the correct D number on the G41 line and the correct offset in the offset register.

Any ideas, what is happening?

[gcode]

Is the G41 move a line

[taperlength]

Yes, it is a straight G41 G1 Y-.0492 D5 F1. 

The offset is .036 but it moves -.0492

[gcode]

I'm guessing you're running control comp

I'd try wear comp

[taperlength]

Yes, I am using control comp because everyone in this shop does.  There must be a problem with this machine because no one ever uses it.  I have not been here long enough to know the history.

[Mic6]

And you probably only had one of those thread mills huh?  What kind of machine was it?

[MLS]

Is the machine capable of comping on 3-d movement?  Know some will only comp in planar motion.

[taperlength]

Yep, just one threadmill.  The machine is a YCM.  It has a fanuc 0i control with a different name on it.

[civiceg]

MXP? YCM makes a decent machine. Most Fanuc's require a special M code to rigid tap from the factory, you can make it so that a preparatory M code is not needed for rigid tapping. Why the "default" is set like this, I have no idea. Out of the 3 or so YCM's I worked with, they all required m codes to rigid tap from the factory, simple parameter change. 

 

Also, we used IJK's on them and not R's. 

[Newbeeee™]

Taiwan way I believe.

M29 usually is rigid tapping.