Unvarified Crashes??

[plastech]

I have a problem!!! I'm running MC9.1SP2 MR0304 on a Dell P4 3.2GHz with 2Gig ram and a Nvidia Quadro FX 1300 128MB vidio card and updated vidio driver. I programed two cavities in a mold and I have two crashes one in each cavity and in different programs which don't show up in verify or backplot. The problem areas are both arcs in the programs which have the correct information except the direction of the arc is wrong. The first arc gouged the part and faulted the machine because of X travel limits the second arc was much smaller and gouged into the cavity. At first I thought this was a post problem but I checked the NCI files and found that the information is incorrect there. I think that the cause may be in filtering. I run the filter at a 2:1 ratio .001 for filter tolerance and .0005 for cut tolerance for a total of .0015 One way isn't checked create arcs in XY XZ and YZ are all checked and a min. arc of .005 and max.of 100.0.

 

Any information or thought will be very appreciated!!!!

 

Thank You, Rick

[chip]

Sorry to hear that.... What kind of machine are you running? I have seen Fadals not be able to make small arcs on surfaces and gouge. If you want to send me the file. I will look at it for you and see if I see

anything.

[Roger Peterson]

What kind of machine?

 

what controller?

 

was the arc in the G18 plane?

[plastech]

Hurco VMX42 with an Ultimax control and yes the arcs are in the G18 plane.

[Roger Peterson]

Hurco, Milltronics and several other controllers have the ability to run arcs in the G18 plane in two ways. The correct way which if you look at the arc from the back of the machine, or you can run it as if you look at it from the front of the machine. It is just a parameter that needs to be switched on your machine to flip the G18 arc. Do a simple test, draw an arc in the front view and put a toolpath on it and post it out. You will see that if you look at the arc from the front view the G02/G03 will look backwards. If you look at the arc from the back view the direction will appear correct. There is nothing wrong with your file, your post, or your machine, just a parameter in your controller that needs to be flipped.

 

 

HTH

[plastech]

Thank You Roger!!! I will look into switching that parameter. What you pointed out is what I was thinking as far as the direction the XZ plane is viewed from.

[Roger Peterson]

I guess they do this so it is easier to program manually but, you're not the first to find this out the hard way. If you could post some details on the parameter in question, I would like to have the little bugger in the scope if I ever come accross this on the ultimax.

 

 

later,

[plastech]

Roger,

I found a switch in the MPHUR post to change the output for G18 from G2 to G3 and G3 to G2.

 

The first note in the Users notes: of the post is in referance to the G18 plane.

 

So I didn't change anything in the control.

 

Thank You, Rick

[lynnz]

plastech,

Here is a fix from a while back for Hurco post.

 

"If you are using the Mphur.pst, search for the note on 'swg18'. The hurco and boss controls reverse the G18 plane definition from what the rest of the industry uses. Set 'swg18' to 1 from 0."

 

Hope this helps you.

lynnz

[Roger Peterson]

Or, you can do that...

 

 

glad it's working for you.

[plastech]

Lynnz,

That is exactly what I did.

Thank You

 

Roger,

These programs were the first ones I sent to our new machine (Hurco) so we were using a practice block. At least I didn't ruin a mold insert,tool or the machine before I resolved the problem with your help.

Thank You, Rick

[Thad]

quote:

---

I guess they do this so it is easier to program manually

---

I can't believe someone would do that! That's about as asinine as having the option to reverse G41 and G42...you know, in case you're left handed.

 

All programming is done from the positive, looking toward the origin. If you're programming in the XZ plane, or G18, then you're looking from the positive Y to the Y axis origin. For some control manufacturer to change this "to make it easier" is just plain stupid.

 

Thad teh MNSHO

[Roger Peterson]

Thad my man, your preachin to the choir.

 

 

But then again I guess they wouldn't have done it if someone didn't ask for it??????

 

 

The only problem I have with flippin the Gcodes around in the flippin code is make sure you don't try and run that in another machine.