We get poor tap life when rigid tapping on our 2008 MB56 VMC.
Taps under M16, M4-M12, work very well as long as we use a tap holder with some float. (Annway TER-32 "Rigid Floater").Without the floating holder these were hopeless too.
We program in IGF which outputs a G284 cycle. OSP P200M control.
Always drill oversize holes. Have tried cutting compounds.
M16, M20 & M24 taps fail unpredictably and I am determined to get to the bottom of this! Failure usually starts with chipped cutting edges and eventual breakage. Tried every brand and geometry spiral flute tap under the sun-Dormer,Stock,Hahnrieter,Sutton etc.
Have just changed parameters "Synchronised Tapping" as per Okuma's recommendations:
TAP MODE G84/G74 = FLOAT TAP. (WAS SYNC. TAP)
RETRACT 100%. (WAS 200%)
They have also got me shopping for a Nikken Micro-Float tap holder or similar.
I asked if they can measure the spindle/Z axis synchronisation - said they haven't done this before.
Daewoo did one of our C axis lathes which had a rigid tapping problem and ended up tuning servos to fix it...
Any comments/ideas before I put my 4th $200 M24 tap in for this job?
What kind of tap holder are people using for larger taps?