work offset in fanuc 6m b- help

[rags]

hello,

we are new to hmc's, we bought a used niigata with 6 m controller, we would like to know how work offset values are to be assigned.



normally in a vmc x and y values are obtained by truing/dialling the fixture or master job and assigning z values based on the height of the job.



We tried the same procedure but the table seems to go else where when we run the program.we were told that we need to know the dimensions from X0, Y0 AND Z0 to the centre of the table which in our casethis dim is not available to us. We only have the stroke of each axis.



any suggestions

thanks in advance

rags

[Stu D]

Hi is the 6m set up for multiple work shifts or just g92 I need this info to get an idear on what to tell you.

[rags]

thanks stu d ,
we need to machine the part in all 4 sides by table indexing, hope this answers your question, i think we need multiple work offsets.
thanks
rags

[Stu D]

Check the offset page there should be G54 G55 G56 G57 ect on this page these are your work shift registers.
If they are there you need to home the machine determine the distance from machine home to the work datum in x y z enter these into the register.
For instance face 0 deg Could be G54 In the program first line G91 G28 X0 Y0 Z0
This sends the axis home then G54 this should set the work coordinate system.
Let me know if this helps Its a bit dificult not being able to see the setup of the 6m as they are all a little different from each manufacturer.

[rags]

thanks stu d,
will try this and revert back tomorrow,
rags

[rags]

thanks again stu d,
We tried all that you have said but when we run the program after inputting the work offset the axes goes to an unspecified place without any relation.

Btw we are not able to acess the PROGRAM LIBRARY AND PROGRAM CHECK page on the 6m, any parameters to be enabled.

thanks
rags

[tobyaxis]

There may not be any in that control. The older 6M controls have either one screen for distance to go and a different screen for viewing the program. What year is your Machine Control?

As for setting G54-G59 try this. Send all axies Home. Put the control in MDI Mode> Type in G92X0Y0Z0;< this ";" is labled EOB for "end of block" Hit Cycle Start. Now go to the Work Position in the setup page/offset> cursor down to G54 enter in 1/2 your table travel for X and Y. Back to MDI Mode and Type G90G0X0Y0; > Set the rapids low and then hit CyCle Start again. If this method is correct the machine will move to the center of the table. If not I have no idea and would have to see the Machine and Control in person.

[ajl6549]

Originally Posted by rags thanks stu d , we need to machine the part in all 4 sides by table indexing, hope this answers your question, i think we need multiple work offsets. thanks rags

I would need to know what opptions your machine has, like g92 or g54 - g59 etc.

[rags]

we got a local expert and finally got it right,the problem seems to be the INC/ABS issue, the machine seems to remember the INC and not ABS , so we got it to go home every time so that it takes the ABS values,now we took work offset, tool offset and every thing seems fine.

btw can u tell us some thing abt the LIBRARY AND PROGRM CHK page, does the 6m has this option at all, our other machines gave 0m,0i in which these features are standard.

we ran into one more problem,some times during tool change the spindle does not orient properly and trips off to an overload alarm but no alarm nos are displayed except for the red light indicating spindle overload.any ideas

thanks a lot again
rags

[ajl6549]

We have a 6m on a v-12 mazak (1979 vintage) and it does not have a prog. liberary page however you can "scan" thru them by going to edit mode, press letter o, then "can", and then the down arrow key. This steps thru the prog's. in desending order. as for prog check... no dice on our machine.

[tobyaxis]

Originally Posted by rags we got a local expert and finally got it right,the problem seems to be the INC/ABS issue, the machine seems to remember the INC and not ABS , so we got it to go home every time so that it takes the ABS values,now we took work offset, tool offset and every thing seems fine. btw can u tell us some thing abt the LIBRARY AND PROGRM CHK page, does the 6m has this option at all, our other machines gave 0m,0i in which these features are standard. we ran into one more problem,some times during tool change the spindle does not orient properly and trips off to an overload alarm but no alarm nos are displayed except for the red light indicating spindle overload.any ideas thanks a lot again rags

Write a short program in MDI like this

G91G28Z0M5
M19
T2
M6

The spindle may have to be stopped with an M5 before Origin (M19) can take place. Some Controls are picky about this.

[ajl6549]

P.S. prog. chk. is an option on a 6m fanuc control. It would depend on the machine manufacturer.