I was thinking DRO and typed LED Sorry about that... it needs to be an DRO for the Max F that you would like to have.

Hey,

OK, Well I put a LED there.  What's next?  How do we tie it into a user defined parameter?

Thanks,
Sid

bump

Here is a quick Macro

'If the FRO rate is over the Max set the FRO % to the right val
FMax = GetOEMDRO(1200)
If (FMax = 0) Then
   Exit Sub
End if
FRO = GetOEMDRO(55)
If(FRO > FMax) Then
        Value = FRO / (GetDRO(21)/100)
        NewFRO = (FMax / Value) * 100
   Call SetDRO(21,NewFRO)
End If 

And I changed the screen set too...


That should get you going

THANK YOU BRIAN!  It's Awesome!

Regards,
Sid

In my case its the rapid that takes it over the top. Wouldn't it be nice if the FRO only affected feed rates below the max. For example, I decide because of a light cut I can up the rate so I F11 the FRO. Now in a rapid my z is skipping steps. I hate that.

Jim 

Jim,

I don't get it.  Isn't Rapid always the same or does the FRO effect rapid also- I never really noticed that.

Sid

it will not make the rapids faster but under 100% FRO will slow them down..

I may be wrong about the rapids but here's my situation. My mill will slide at any speed I program. If the speed's  over the maximum the slide goes to its max and continues to move. But, if I FRO above 180 percent  no matter what speed's been programed I skip steps. I assumed it was skipping during the rapids because they're the fastest, most of the time.

Something I need to set differently?

Thanks,

jim

Jim,

I'm not sure if you need to set something differently.  To be honest the whole issue of feed rates and motor tuning is a tad bit mind boggling to me.  I think this is due to the fact that some basic principals need to be established in order for me to understand exactly what is going on.

That being said, either I need to just play around with my machine here and have a little 'discovery' time or perhaps Mr. Barker (or others) could help to clarify. 

1.  My Impression is that on the motor tuning screen that the Velocity represents the MAXIMUM VELOCITY THE MOTORS WILL TURN ON A RAPID G0 command.  MAXIMUM meaning that regardless of how high you set your FRO that the motors will never turn faster than this.

2.  If #1 is true then if one sets the max velocity on the motor tuning screen and does not miss steps, it should never be possible to miss steps during the course of a cut (unless the cutter is being restricted from moving but, this is another issue and not related to trying to run the motors too fast

If #1 is NOT true, then measures need to be taken to insure that #1 IS, in fact, true.  I would venture to guess that the measures one would take would be.... BEFORE you go to your motor tuning screen, set your FRO at the MAX (I think it's 290%).  Then do your motor tuning/set your max velocity

So, which is it gang?  Is #1 true or not?

Thanks!

Sid