- Toolchanger dropping tools during the tool change process.
- Loud noises and "bangs" when the tool holder is un-clamping or clamping during the tool change process.
- ATC arm or mechanism jamming in the tool holder under the spindle.
Step #1 :
Place one of your tool holders in the spindle and clamp it as normal. Using your 6" scale ... measure from the face of the spindle to the center of the V in the toolholder. +/- 1/64 of an inch is usually a good tolerance to use when measuring.
Step #2 :
Next ... remove any tool holders from the spindle ... leaving the spindle with no tool mounted. Step through your ATC process until the ATC arm or carousel comes into position under the spindle. Here you are mimicking the ATC process ... step by step ... and are pausing the process as if the ATC mechanism is under the spindle as it would be to change the tool. Again using your 6" scale ... measure from the face of the spindle to the male part of the V that would fit into the tool holder. Again ... +/- 1/64 of an inch is a good tolerance.
If the dimensions from Step #1 and Step #2 are off by more than 1/64" ... ATC mis-alignment may be the cause of any problems you may be experiencing with your ATC mechanism.
The Fix :
In a Fanuc controlled machine ... the Z axis stops at the "tool change position" through the use of the Zero Return or Home position ... G28 command line. Although a hard limit switch is activated during the zero return process ... the real process works like this.
- The axis rapids until it hits the limit switch.
- At which point the axis movement speed is reduced ... and the axis continues to feed until the axis feeds off the limit switch.
- After the limit switch is switched off ... a certain additional amount of movement is executed ... this additional movement amount is knows as the "grid shift".
Performing this simple check can give you a better idea if ATC mis-alignment may be causing your ATC problems ... and which track to pursue to obtain the correct method of repair.
Until next time ... Happy Chip Making !!!
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