Mitsubishi Electric MELDAS C6 Programming Manual page 54

6. Interpolation Functions
Thread cutting Inch input
Input unit system
Command address
Minimum command
unit
Command range
(Note 1) It is not possible to assign a lead where the feed rate as converted into per-minute
(3) The thread cutting will start by the one rotation synchronous signal from the encoder installed
on the spindle.
(4) The spindle speed should be kept constant throughout from the rough cutting until the
finishing.
(5) If the feed hold function is employed during thread cutting to stop the feed, the thread ridges
will lose their shape. For this reason, feed hold does not function during thread cutting.
If the feed hold switch is pressed during thread cutting, block stop will result at the end point of
the block following the block in which thread cutting is completed (no longer G33 mode).
(6) The converted cutting feedrate is compared with the cutting feed clamp rate when thread
cutting starts, and if it is found to exceed the clamp rate, an operation error will result.
(7) In order to protect the lead during thread cutting, a cutting feed rate which has been converted
may sometimes exceed the cutting feed clamp rate.
(8) An illegal lead is normally produced at the start of the thread and at the end of the cutting
because of servo system delay and other such factors.
Therefore, it is necessary to command a thread length which is determined by adding the
illegal lead lengths to the required thread length.
(9) The spindle speed is subject to the following restriction :
Maximum feedrate
1 ≤ R ≤
Where R ≤ Permissible speed of encoder (r/min)
R
Thread lead
Maximum feedrate : mm/min or inch/mm (This is subject to the restrictions imposed
(10) The thread cutting start angle is designated with an integer or 0 to 360.
B (0.0001inch)
F (inch/rev) E (inch/rev)
1(=1.0000), 1(=1.000000),
(1.=1.0000) (1.=1.000000)
0.0001 to 0.000001 to
99.9999 39370078
feed exceeds the maximum cutting feed rate.
Thread lead
: Spindle speed (r/min)
: mm or inches
by the machine specifications).
E (threads/
F (inch/rev)
inch)
1 (= 1.0000), 1(=1.00000),
(1.=1.0000) (1.=1.00000)
0.0255 to 0.00001 to
9999.9999 3937009
46
6.7 Thread cutting
C (0.00001inch)
E (threads/
E (inch/rev)
inch)
1(=1.000000), 1(=1.0000),
(1.=1.000000) (1.=1.0000)
0.000001 to 0.25401 to
3937009 999.9999