Problem- Lathe Post giving crazy numbers

[lynn mynatt]

when I post to out Haas lathe, the post...at the very end shows some crazy LARGE dimensions for I and J in the circular moves. This is on a part 2" dia. with a couple of grooves 1/2" wide and 1/8" deep with radii in the corners. I've only pasted the section of code where the problem shows up. Just wandering if anyone has seen this before and what did you do the fix it?

(JOB 1 GROOVE CYCLE ) (TOOL #27 1/4 OD ANVIL ) N817 G0 X1.2213 Z-4.004 N818 G42 G1 X.9788 Z-4.0015 F5. N819 G3 X.974 Z-3.9967 J-.0012 I.0036 N820 G1 Z-2.6268 N821 G2 X.8694 Z-2.5033 J-.1269 I-.0014 N822 G1 X.8671 Z-2.5025 N823 G2 X.7865 Z-2.4985 J-.0624 I-.4428 N824 G1 Z-2.2642 N825 G0 X1.2213 N826 Z-1.9913 N827 X.974 N828 G1 Z-2.117 N829 G3 X.8633 Z-2.25 J-.1247 I-.0089 N830 G2 X.7868 Z-2.2516 J-.0303 I-.3798 N831 G3 X.7865 Z-2.2532 J.0018 I-.0012 N832 G0 X1.2213 N833 Z-2.0023 N834 X.974 N835 G2 X.973 Z-1.1174 J-201.2139 I.2164 N836 G1 X.9726 Z-1.1134 N837 G2 X.8679 Z-1.0028 J-.1257 I-.0142 N838 X.7865 Z-.9988 J-.0605 I-.4006 N839 G1 Z-.7645 N840 G0 X1.2213 N841 Z-.4908 N842 X.9741 N843 G1 Z-.6092 N844 G3 X.9255 Z-.7254 J-.1324 I-.013 N845 X.8682 Z-.7495 J-.0695 I.0853 N846 G1 X.7915 Z-.7511 N847 G3 X.7865 Z-.7535 J-.0023 I-.0017 N848 G0 X1.2213 N849 Z-.5018 N850 X.9741 N851 G2 X.9729 Z-.1162 J-37.0107 I.0827 N852 G1 X.9726 Z-.113 N853 G2 X.8691 Z-.0032 J-.1257 I-.0147 N854 G1 X.8668 Z-.0024 N855 G2 X.8528 Z-.0008 J-.0099 I-.0247 N856 G0 X1.2213 N857 Z.0016 N858 X1.1224 N859 G2 X.8528 Z-.0008 J18431.3971 I-2066618.8766 N860 G0 X5. N861 Z5. (TOOL #1 80 DEG. 1/64 ROUGH TURNING ) N862 G28 N863 T0101 N864 G54 G00 X1.3108 Z.0029 M08 N865 G96 S500 M03 N866 Z5. N867 X5. N868 G97 N869 G30 U0 W0 N870 M1 N871 G70 P872Q

[Allen123]

awesome!

[paul gibson]

Lynn,

Have not messed w/ BobCad since the Demo V-17 days. But does it give an option to use an R value as opposed to the I/K/J values? If so, might toggle that on and see if you get better results.

Regards,
Paul

[lynn mynatt]

If there is a setting for R values, I can't find it. Oddly enough, it seems to run ok in verify mode, but when i send it to the machine, it freaks out. I'll call Bobcad and see what they can do, it's my understanding that they will work with post issues and I'm pretty sure thats where the problem is.

Thanks for the help though!

[The One]

Open the post in a text editor.

Go to line 242. it should look like this: 242. Arc center a=absolute, b=incremental, d=unsigned inc., e=radius? b

Change the letter at the end to e and save the file.

Then repost. You should now get Radius output.

I have seen these occur as well. It will most commonly happen when you have the Collision detection turned on.

Regards

[lynn mynatt]

The One,

If I understand you correctly, I was to change the b to an e ? Line 242 was exactly as you said, but changing the letter to an e didn't fix the problem unless I'm doing something wrong. I did repost and I'll try again, but I'm pretty sure I got it right.

And thanks for the help.

Note: I double checked and the "e" is saved to the post. I also tried with collision detection off. THAT worked! Now, my question is.... am I going to crash something without the detection?

[mmc005]

Lynn,
I have seen alot of issues with the collision detection on, I always leave it off. You should not crash as long as you know that your tool is the correct tool for the operation that your doing.
For example, you need to use a grooving tool for a deep groove and not a standard turning tool. The turning tool will "crash" trying to get into the groove while the grooving tool is designed to be able to cut deep grooves without crashing.

[lynn mynatt]

thx mmc, I haven't got the chance to run the program yet, somebody else has the machine tied up (it has conversational programming as well). The simulation looks good though and the large radii numbers are gone in the post.

Thanks for the help EVERYBODY.

[The One]

Lynn,

Try changing the letter to a capital "E". Sometimes that is the problem with converting over to radius.

The other option is to do a find and replace in the post. Replace all instance of "rcenter" with "arc_center". There are many variables in the posting engine that do the same thing, only slightly different, and this could be the cause to the lack of R values.

As far as crashing, you really have to take the geometry into consideration. If there are areas on the part that you could accidentally cut into with the backside of tool then you need to have it on. If it is just a simple turned profile, you should be fine.

Regards