4. INTERPOLATION FUNCTIONS
This function for continuous thread cutting is such that fractional pulses
output to a joint between move blocks are overlapped with the next move
for pulse processing and output (block overlap) .
Therefore, discontinuous machining sections caused by the interruption
of move during continuously block machining are eliminated, thus
making it possible to continuously direct the block for thread cutting
Since the system is controlled in such a manner that the synchronism
with the spindle does not deviate in the joint between blocks wherever
possible, it is possible to performed special thread cutting operation in
which the lead and shape change midway.
Fig. 4.10 (a) Continuous Thread Cutting
Even when the same section is repeated for thread cutting while changing
the depth of cut, this system allows a correct machining without impairing
1 Block overlap is effective even for G01 command,
producing a more excellent finishing surface.
2 When extreme micro blocks continue, no block overlap may