@Anonymous
Is it supported on your machine ? Does your machine have "Rigid Tap" capability ?
If the machine has the "Rigid Tap" capability then (Without using floating Tap holder) you can simply program the hole more than once at different depths so for example the thread is to be 15mm deep, first tap (84 Cycle) depth goes to -5mm, the machine just completes the cycle then stays at the hole X/Y positions and then does a second cycle but with a 10mm depth, and a third cycle going to the full 15mm depth, this is a recognised method and some machine controls like the HAAS and Fanuc have this capability built in to the control.
I don`t think that your Siemens 802D will have it but it may be an "option" that can be turned on, contact Siemens for this or consult your Siemens Manual.
There are few machines that have the proper chip breaking cycles capability, I used to have a Japanese SUGINO Drill/Tap machine that used a system where I would input the number of the pitch to go in and the number of pitch moves to break the chips, eg M6 x 1.0, program in 3 and back 0.75, depending on material, brilliant machine 🙂 🙂
@boopathi.sivakumar may be able to modify your existing PP to enable the different depth system as in the HAAS but as far as I know it is coded in the control and is called up by the 84 cycle command.
Or maybe the 840D PP will work for you ??
For now all I could find is a modified 840D PP that does output the correct chip breaking code, see below for an example of an M8 x 1.25 tapped hole with chipbreaking.
; %_N_1001_MPF
N10 ; T2 D=8 CR=0 - ZMIN=-10 - right hand tap
N11 WORKPIECE(,,,"BOX",112,0,-10,80,26,26,-26,-26)
N12 G90 G94
N13 G71
N14 G64
N15 G17
N16 G0 SUPA Z0 D0
N17 ; M8 x 1.25 Tap
N18 T2 D1
N19 M6
N20 S400 M3
N21 G54
N22 G0 X0 Y0
N23 G0 Z15
N24 M8
N25 G17
N26 MCALL CYCLE84(5, 0, 5, -10, , 0, 3, , 1.25, 0, 400, 400, 0, 0, 0, 1, 2, 0.16) The 0.16 is the Chip break distance I set 🙂
N27 X0 Y0
N28 MCALL
N29 G0 Z15
N31 M30
Anyway, PP file attached and the small Fusion file that I created for the test.
Hope this is of some help and that @boopathi.sivakumar can sort out a PP for you 🙂 🙂
Stay Safe
Regards
Rob
