FM100 Fleximatic. Siemens System 8 Sprint.
KTM Panel 45054. Diagram 454254.
Hello,
I am currently working on a KTM machining centre that 'screws up' during tool-change.
The 1st tool change is always ok, but subsequent tool-changes send the Z-axis into + overtravel.
The problem seems to relate to commands in the sub that send the Z (Z carries the work on this m/c) to a safe position for tool changing. Z is sent to +500mm which is away from the spindle and 1mm short of s/ware + o/travel.
During this tool change cycle, the axis position displayed is updated to take into account the inserted tool length. (eg. if tool length is 100mm then axis position display now shows Z at only +400 from spindle (tool tip) The actual position of the axis in the m/c coordinate display (Test "eyeball" N812) is still +500 and has not moved since being put at this 'safe' position.
On the next tool-change, the Z-axis is again requested to move to the safe position of +500, but this time goes into overtravel (+501)
The problem can be simulated in MDA (when a tool length offset is active) by programming a move in absolute m/c coordinate mode "G60 G0 G90 G80 G53 Z 500" where I would expect the axis to move to +500 with respect to MACHINE REF COORDINATES, but the axis wants to go more! and O/Ts.
I have proved by experimentation that the axis is trying to move to the commanded position including the tool length offset, hence O/T at +501 !
I believe that the active tool offset should be ignored when L959 moves the Z axis to the safe position of +500.
What G Code is used to move an axis with resect to m/c coordinate system (with respect to REF point) ? is it G53? if so, this is not working.
What on earth is going on, I am very confused?
Any help, pointers, jokes! would be appreciated.
If necessary, I will list the Lprog here.
Oh, forgot to mention the m/c was recently moved, it lost it's memory, and all had to be reloaded. I have checked the parameter listing against a print-out of what I am told should be in there and it is correct?!
There is heavy use of @ functions in the tool-change sub-routine (L959)
Do you have any knowledge of System 8 "@" commands?
Can I view/download a list from anywhere?
I hope you can help, or point me to someone who can.
Regards Richard.
rlmts@controlit.fsbusiness.co.uk.