We have an old Heian that has an issue with cutting corners square when changing directions


For example: When cutting out square parts, before arriving at the destination of the current line of code, it seems to take off towards the next location before it has arrived. This seems to be consistant no matter if it is going from X to Y or Y to X move.

We are cutting at 225ipm. At this feed it seems to start on the next line about 0.1" before it should change directions.

I believe this is a parameter issue. I have turned on the corner override parameters to no effect.

Any suggestions?

I don't have a 6m manual or know what parameters it would be but it sounds like you need to turn off the look ahead function in the control. I have seen this before because the machine looks ahead and processes the data to decrease time but the machine code can start to react to the code a hair before the current line is executed.

Stevo

I've looked through both the maintance and operator's manuals and have been unable to locate a parameter refering to "looking ahead". Would it be under different name/term ?

Would G64 help?

I could not find the parameter manual for a 6m in Idocs, but you could look at the in position width for each axis (parameter 1826 on 16i)

What about using a G09 (exact stop) for your feeds instead of G01
(not sure its available on a 6m)

Another trick you can try is a small dwell before you change directions

I found the term "look-ahead" many times in the 16i manual

There you go...hope it helps.

Attached Files

6MB Parameters.zip (5.76 MB, 90 views)

I inserted G61 which put the machine into exact stop mode, and that made the parts come out perfect, except for the 1.125" holes that were cut with a 1/2" tool and the fact that it nearly doubled my run time. The holes looked more like diamonds when run with G61. When run with G64 they look better, but are still quite a ways from perfect.

Ideas?

Feeding at 225 IPM on the 6M will do what you are getting.
I tried this a long time ago:
A short dwell at the end of the line, it will add cycle time, but you will have to give up something. Either that or a newer machine.
Good luck: Heinz Putz, Center for CNC Education.