CNC LATHE POST PROBLEMS

[cnctc]

I am making the program in fusion and when i turn compensation type to "in control" on the finishing pass everything looks fine in fusion simulation but when i go to my machine and simulate or do a dry run it adds a little inverted arc in the two corners. You can see what it is dong in the scree capture i attached. If i use compensation type "in computer" it works fine?

FYI my machine has a turret but it is a front mount instead of a rear mount. Also if i edit the code on the finish pass and change the G42 to a G41 on line N73 the program works properly but the dia. of the part is .120" too small on both diameters?

[suntravel]

N80 X1.7381 Z0.2559
N81 G40 G0 X2.425

should work.

Make shure the nose Radius in Tool Setup is correct, seems to be lager than usual.

Uwe

[suntravel]

By the way, it is much faster to use Intercon Profile for parts like this than fusion.

With Intercon a program like this is made in less than a minute....

Uwe

[cnc_smith]

Uwe correction will fix the problem. The fish hooks, what we call them here at Centroid, ( your wording inverted arc) happens when cutter comp is turn on or off, in your case turn off and there is not enough travel in X or Z to allow for the nose radius to be compensated for to the next move. Most times the X needs to move the diameter value of the nose radius after cutter comp is turned on or or off. Z move would be equal to or greater then the nose radius.

[cnctc]

Made the lead a little longer and it worked perfect! Dont know why I didnt think to do that?? Fyi the nose radius for that tool is .030. Thanks a bunch!!