canceling tool offsets

[howling60]

another quick one regarding offset canceling (i had a similar issue when using G53, 54, etc a while back)...

my prob right now is this...

doing a drill pattern on a plate, spot-drilled the pattern, and had an "initialization" such as below

g54
g43 h1
g01 somewhere..
spot drill pattern

g53
g28 retract for tool change
*manual tool change here*

g54
g43 h2
g01 go somewhere
drill pattern completely

etc
etc

program performed correctly in the spot-drill section, but when i did a manual tool change, and the machine came back in using the #2 tool, the height offset was not correct (it sat about 2" off the part) but thought it was @ z0 in the fixture offset.

we tried putting a g40 in to cancel the previous offset, but. that didnt' seem to change things at all.

help? thanks!

-nate

[Mr.Anderson]

In your G43 H2 you probably have code to set the tool height to the current H value, which in your case is showing a value of 2 (tool #2).

Use the LOGFILE feature and perform the same actions again to write the actions to the log and then check the log, it will show you what and why this happened.

Or you can just place a T# in your program to have the system automatically set the tool parameters to the currently issued T#.

[lakeside]

Try This Format
O1
(test Drill)
G0 G90 G98 G49 G17 G40 G80 M97
T1 M6 (spot Drill)
G54 S500 M3 G0 G43 X0. Y0. H1
G0 Z.1 X-2.135 Y0.677
G81 X-2.135 Y0.677 Z-.3 R.1 F5.0 G99
X-1.333 Y0.792
X-0.708
X-0.062 Y0.771
G80
G52 Z0 H0 M19
M30

[Geof]

In standard G code G40 cancels G41 or G42 Tool diameter (or radius) compensation and tool length compensation G43 is cancelled by G49.

[howling60]

Originally Posted by Mr.Anderson In your G43 H2 you probably have code to set the tool height to the current H value, which in your case is showing a value of 2 (tool #2). Use the LOGFILE feature and perform the same actions again to write the actions to the log and then check the log, it will show you what and why this happened. Or you can just place a T# in your program to have the system automatically set the tool parameters to the currently issued T#.

wasn't aware the T would automatically apply tool comp, was trying to use what i was told was industry standards for tool height comp.


the G49, had a brain-cramp, that's why we didn't use that.

thanks for the help all.. maybe one of these days we'll be actually cutting parts with this machine.

-nate