Machining a long part using the special device (option 4900) can be improved by applying the following tip:
The use of bar clamping jaws is not essential to lock the bar during multiple bar feed operations. The counter-spindle can do this equally well, bearing in mind the following restriction:
The diameter of the counter spindle collet must be the same as the material diameter.
Programming :
Basic model V4_10_L, of the DECO_20 machine:(Long part model supplied as standard in the TB-DECO software).
Operations 1:9, 1:10, 1:12, 2:2, 2:3 and 2:4 concerning bar clamping by tools T11 and T21 can be omitted and replaced by a counter-spindle clamping operation, as described below:
This method offers the following savings:
- It releases positions T11 and T21 which are normally occupied by the clamping jaws, thus saving two positions for tools.
- The facility of barfeeding, without having to stop spindle S1, by synchronizing spindle S4.
Operation 4:7 executes counter-spindle chuck clamping (M110), operation 1:11 executes bar feeding Z1 and finally, operation 4:8 executes the unclamping of the counter-spindle chuck (M111) once bar feed has been completed. The other machining operations can continue in the normal way.
Axis Z4 now has to be correctly positioned to execute clamping. This position depends on part length. This position can also be simply determined directly in manual mode on the machine, at the time of start-up or, in theory, by adding the various programmed lengths (original offset and tool geometry)..
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