Tool breakage mounting considerations and detection:
Basic model Mounted on the pallet:
When mounted in the machining area, the spindle is programmed to the proper location to comp, for what ever tool length is present in the spindle. Minimal cycle time is lost.
If the tool sensor is mounted in the magazine, it will be used at a fixed position and can't be used for multiple tools. This is because tool lengths vary and have no axis to move the tool into the proper location.
Built in encoder type:
This has the ability to learn 30+ different tool lengths in a CNC tool changer. This unit can be mounted in the magazine area with little or no loss of cycle time. However, each tool must be taught positions and must have separate M-codes for every tool in order to recognize the different tool lengths. If mounted in the work envelope, then you should go with the basic model and program the axis to the location you would like to check the tool length. Unless you are using it to check position of parts or using it for a different application.
Plunger type tool breakage unit:
This is used for areas where the basic model can not be used. Also, this could be used for sensing hole depth or whether an operation was completed.
Here are some common well known tool breakage manufacturers:
- BK micro
Installation and requirements:
M-codes or source of actuation is needed. The feed hold circuit is generally tied into or an external alarm is used to stop machine operation. A remote module is installed in the electrical cabinet. If the unit is mounted on the pallet, a cable is run down through the cable tracking and possibly through the way cover.
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