E1 and G28 codes causing offset problems ?

[northwestfab]

We just got another vise for our mill. GibbsCAM we work with, allows the program to be run in multiple positions, with the distance between the vises input into the post.

When I select 'Full Up' for the Z move between the parts, the post inserts E1 and G28 between the parts.

When the machine moves to the next part, the part is cut approx .4" below the surface it should be. I searched through all saved offsets and fixture offsets, and can't find a reason why/where it is getting the command to run a new offset.

I understand the E1 and G28 codes, I just cant find why the machine has decided this specific increment to change z depth from. It has to be saved somwhere.

Not only does it change mid program, it changed the master height of my tool. when I re-started the program, part one was now cut .4" lower than it should have been.

Where on my controller do I have to delete a value to stop this from happening, or is this directly a post processor compatibility problem ?

For now if I choose 'exit to clearance plane' it solves my problem. I'm asking the question to try to learn more about my fadal or some of the quirks.

-Kyle

[Shizzlemah]

E1 G28 ... I think you really want E0G28 for traverse, then ExHyDy to start machining at the next location.

Or does Gibbs post it all using E1, and you specify offsets that get generated into the code?

Most likely it is pickung up the same offset twice (esp rerunning and moving by 0.4") I'd be sure to carefully check the E and H words in the post.


E0 will turn off the workpiece coordinates. E1, E2 .. E48 will apply those coordinate systems.

[northwestfab]

Gibbs uses E1 as the fixture offset 1.

Gibbs modify's the X,Y co-ordinates to move to the 2nd location, rather than running two fixture offsets (in this case).

Now it gets weirder ...

I got rid of the dual vise program, said f-it for now, I'll make parts on 1 vise.

Now with a 1 tool program, one cut on one soft jaw, 1 cut on the other, are mismatched !!

It seems to me some G code in the dual vise program, has now changed a controller setting ?

-Kyle.

[Red Frog]

I have to watch our Fadal like a hawk. It's a quirky machine and it may be a software problem for all I know. We use a short program to re-home everything before setting a tool to cut some confusion.

[cadman]

Are you using separate offsets for each vise (E1, E2)? In Gibbs when you post you only need to input how many parts there are and the offset type as "work offsets." You will need to set the fixtures offset positions at the machine, XY and Z.

[northwestfab]

No, I'm running one offset, and telling gibbscam how far the vises are apart, I machined the sides so they're consistant that way, and faster to setup, only have to find 1 datum rather than 2 (for loose tolerance parts anyhow).

I have no typed in manually a very basic program, it machined 3 ledges, and then had NO problems.... this has GOT to be software related.

The thing is ... I've been using this same post on this machine for the last two years.

-Kyle
NWF

[cadman]

It should be easy enough to check the positions in the program and see where the table moves to. If you want to troubleshoot your program you can send me a sample program that gives you errors and I can post it with any of my Fadal posts. Never have had a problem with any of my posts.

[carbidecraters]

Go into your tool height offset table and hit your space bar and see if E1 has a Z offset. I dont use G28 I just use

G0Z0H0
E1 X-1. Y1. (This way it goes to that location without going to E1 x0y0 first)