Lathe canned cycle question

[Columbo™]

I am getting a TOOL COLLISION WITH STOCK error......

 

Is this a canned cycle problem.....I have tried a couple of different lead in/outs and get the same error......

[Goldorak]

3 things to check

 

1- enable the "extend contour to stock" to set the reference point outside of the remaining stock

 

2- be sure to remove more material than the tool radius

 

3- in lead in/out parameter pages , add a line or extend the contour to start outside of the stock

 

 

this should to the job !

[Columbo™]

On item 1

 

Stock boundry cannot be adjusted.

 

Item 2

 

Done

 

Item 3

 

Tried all options.......

 

 

Same error.......

[chris m]

Is this facing or turning?

 

If turning, is there a lot of material coming off the face? If you need to remove more than .250 or so from the face, MC doesn't seem to see the stock anymore; try "add line" of .100 or more at 0 degrees in the Lead In dialog

[Columbo™]

It's turning.......

 

The tool collision happens in the middle of the part. I am turning and down plunging to remove a bunch of material......It looks like a very wide groove.......about 8 inches wide and about .25 deep......

[chris m]

Standard canned cycles require X to be constantly increasing or decreasing, no up-then-down; not trying to be a wise guy, just unfamiliar with your lathe experience. I don't think this would cause a Mastercam problem, but the machine would puke. If you set you plunge parameters to "not X and not Z" does the toolpath work?

[BrianCNC]

Some lathes have an option called type two cannned cycles which allow a change in tool direction like a plunge in one axis only. For example you can plunge on the x or the z but not both. They are usually designated by a W0 on the first line of the profie such as: N20 G0 X2.85 W0.

[chris m]

I sit corrected; never seen that. That being said, Mastercam still might not like it for one reason or another. One 'problem' with canned cycles is that MC generates, backplots, verifies what it thinks the machine will do, but the machine is really in the driver's seat on canned cycles. If the code posts correctly but MC still complains, oh, well; you wouldn't be the first guy to run programs that MC said weren't right...

[Columbo™]

OK.....maybe I'm not explaining it right.....take a look at the file.....I put it on the FTP site......the file is in X4_Files directory as lathe canned problem.mcx

[chris m]

V9.1SP2 man; no help from me

[Goldorak]

i DL your file on the FTP , this kind of collision is frequent in MCAM i will run the machine like this, the collision came from the tool boundary, it's the same thing that flat boring bars in ID turning , Mastercam give you a collision warning buy in reality the tool clear the part

 

personally i prefer use lathe rough toolpath for that kind of geometry , you can control lead in lead out for each pass

[Rob Peirolo CNC Software]

The collision warning is because the tool is in rapid mode when contacting the part.

Unfortunately there is no way to supress the warning.

[Columbo™]

Thanks Goldorak......I figured as much.......

 

The guyz on the floor what us to use lap mode (canned cycle) because they can control the cut there instead of bothering us to re-post, etc.....

 

I personally don't care for it much either.....

 

Again......Thanks