Fanuc OMb over travel area?

[glovebox20]

Hello

I have the privilege of running a Bridge mill with a Fanuc OMb controller. I enjoy running the machine quite a bit. However, One thing that bothers me is the ability for the operator (me) to Crash the spindle into the Tool change door when jogging the machine around and or executing a program. I was wondering if there was a way to set up the over travels (safety zone) so the operator can not jog the machine past "Y" positive, but when doing a tool change it can travel in the Y positive direction into the tool changer area. I read something about stroke limits (G22 & G23?) and was wondering if this could help me solve this issue.

Thanks

glovebox20

[fanuc-support.c]

G22 Xn Yn In Jn

Imagine a square....

X and Y = top right positions on square

I(X) and J(Y) = bottom left positions on square.

The machine will join these machine coordinates to make a safe zone.

G23 canels G22.

[glovebox20]

Originally Posted by fanuc-support.c G22 Xn Yn In Jn Imagine a square.... X and Y = top right positions on square I(X) and J(Y) = bottom left positions on square. The machine will join these machine coordinates to make a safe zone. G23 canels G22.

Thank for the reply.


However, I could not get it to work. I entered G22 X.039 Y.5 Z.196 I-125.705 J-55.157 K-20.472 ; in the MDI page and pressed Cycle start and It gave me a P/S 010 alarm (invalid G code?) I also tried G22 X.039 Y16.970 Z.196 I-125.705 J.5 K-20.472 ; and got the same Alarm.

I would like the Safe Zone during normal operation to be X.039 Y.200 Z.196 I-125.705 J-55.157 K-20.472 and the Forbidden area to be X.039 Y16.968 Z.196 I-125.705 J.200 K-20.472 (From Machine Zero) except during the tool changes.

All measurements are in Inches.

Thanks

glovebox20

[stevo1]

I always set my softlimits in the machine zone. This would be parameter 701 for Y+. Depending on how the tool change is written in the machine it may ignore the softlimits during the change M6. If it does not then you can set up your tool change position using the 2nd, 3rd, or 4th G30 P()reference position which will not take in account the softlimits.

Easiest way to try is to set your limit then try a tool change. I ass u me that your home position is Y+. If so then set your 701 to 3000 if you have metric ball screw. This is 3mm past home position that the softlimit will alarm out. Metric carries 3 places and inch carries 4 places in this parameter so 3 in parameter 701 would mean .003mm.

Stevo

[glovebox20]

Stevo


Thanks for the tip. I'm not exactly sure how the tool changer is set up, But I do know it uses the O9020 program for the tool change sequence and within that program it uses G28 & G30 for the Y axis position. I'll try changing the soft limits and see what happens.

I assume that if you ever want to manually jog the spindle manual in the tool change zone (for maintenance or what ever), you would have to set the Soft limits back to the original value to do so.

Thanks

Glovebox20

[sinha_nsit]

Define safe zone using software limits.
If you want tool change outside this zone, one way would possibly be to change the limits in the beginning of the tool-change macro, and revert back to the original values in the end of the macro, after moving the tool to the original safe zone.

[stevo1]

Ok that makes sense. Given that, all you should have to do is just change your limits to inside the work area and the G30 should take care of the rest without alarming out.

You can jog in that area. It all depends on how you go about it. If it is in the middle of the tool change and it hangs up then it is still active to be able to move in that area. However if you were to manually open the door and try to jog in that limit then it will alarm out once you reach the soft limits. Now IIRC you may be able to MDI a G30P() (whatever is in your tool change macro) then you should be able to jog in that zone. It’s been awhile since I had to set up a tool change macro so proceed with caution.

Hey Sinha,
I think he is referring to not being able to jog the machine into the tool change door. I use to have an old 10t that would do this. The soft limit setting for whatever reason was set past the door so if a guy is jogging the machine back to home position (right by the door) and was not paying attention then they would wipe out the door. I set the softlimts about 3mm past home position but still about 100mm away from the door. It never happened again. Well until the door switch broke and the machine thought the door was open when trying to do a tool change .

Stevo

[glovebox20]

Well, I tried changing the Y+ over travel (#0701) to 12mm but it alarmed out during the Tool Change (G0 G30 G91 Y0).

Dose any know how to change the #0701 Parameter in the program? I thought there was a way you change change Parameters in the program but forgot how to do it or which ones that could be changed.

I think there could be a way of doing it with the Stroke check/forbidden area function (G22 & G23), but the Fanuc manual isn't very clear on how to do this.

Thanks for the Support Guys

glovebox20

[stevo1]

What was the alarm? When did it alarm out? 12mm + of home?

The numbers I gave you were only general. Depending on how your machine home is setup 12mm may not work.

You can not change #701 via program. This parameters requires a PWE to be set and a power cycle of the machine to take effect.

What you are thinking of for changing parameters via program is the G10 function.

Stevo

[glovebox20]

Darn! Back to the drawing board.

Yes stevo, it did alarm out when the Y axis cross the 12mm line during the G30 Y0 move (Y+ over travel alarm). It needs the Move to 431mm on Y to complete the tool change, but I do not want to cross the Y 12mm positive line during normal operation. Y negative is not the problem and Y 12mm is more than enough room for the machine to home out.

I was hoping to be able to change the #701 paramter during the tool change Program, but It sounds like I can't, and it will not ignore the soft limit overtravel during the G30 move, unless there a parameter or something that can fix that.

Yes, I know it would be easier if I didn't jog the machine past Y 12mm, but sometimes I get in a hurry and my head is up in space some where and BANG! Mother @#$ . It would be better if it would not be possible for me or ANYONE else to do it!!

Well, off to explore other possibilities

glovebox20

[stevo1]

Hmmm. Can you post your tool change program? I would like to take a look at it to see when the G30 is called and at what position.

You should not have to worry about ramming the door.

Stevo

[glovebox20]

Here's the Tool change program this machine uses (Wintec DMV-3000 Fanuc OMb control)

%
:9020(TC MACRO #230)
#33=#4003
#3003=1(SINGLE BLOCK OFF)
G0G28G80G91Z0
M1
G40G49G80G91
#3001=1
IF[#1002EQ1]GOTO7(TOOL IN SPINDLE)
M9
M19
N1
IF[#1004NE1]GOTO2
M06
#1=1
N2
IF[#1003EQ1]GOTO7
IF[#1001NE1]GOTO9
IF[#1000EQ1]GOTO4
N9
IF[#1000EQ1]GOTO3
G28Z0.0
G28Y0.0
N3
G30Z0M81(OPEN DOOR)
N4
M81(OPEN DOOR)
IF[#1NE1]GOTO1
N5
IF[#1006NE1]GOTO5
G30Y0.0
N6
IF[#1005NE1]GOTO6
G28Y0.0
IF[#1007EQ1]GOTO7
G28Z0.0M80(CLOSE DOOR)
N7
G28Z0.0
#3003=0(SINGLE BLOCK ON)
M99
%

I think this Tool change program is a little more complicated than it needs to be, but what ever. The "operation of events" for the tool changer goes something like this

1. Move Z-axis to machine Home G28
2. Orientate Spindle
3. Move Y-axis to machine Home G28 (0mm)
4. Open Tool door, Move Z axis down to G30 position
5. Move Y-axis positive to G30 (431mm) position (This is where it can crash if Tool door is closed).
6. Unclamp tool in spindle
7. Tool Changer arm exchanges tool.
8. Clamp tool in spindle
9. Move Y-axis negative to G28 (0mm)
10. Close tool door/ Move Z-axis machine home G28

I've trying the forbidden area function (G22/G23) with out much luck. The Fanuc manual sure makes it seem easier than what it is.

Thanks for looking

glovebox20