Okuma LB15IIM OSP7000L G178 Syc Tapping

[TrippH]

Hello,

We are having issues with live tooling (tapping) on our new (used) lathe. Program runs fine until G178 line where spindle starts at required rpm (400) and as it approached part, rpm drops to maybe 20 and stalls - no movement and no alarms.

Program:

T0202
M110
SB=400M13
G00G94X3.75Z1.C270M08
X2.15
Z-.5625
G178X-1.02Z-.5625I1.95F22.2224E0.
G180
X3.75
X11.5
Z10.5
M12
M09
M109
M30

We are stumped - any help appreciated.

Thanks in advance!

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[deadlykitten]

i am not sure on this; i will run some trials next week

    T0202
    M110
    SB=400 M13 M08 G94
    G00 X3.75 Z1
    X2.15
    Z-0.5625
    G178 Z-0.5625 C270 X-1.02 I1.95 F22.2224
    G180
  ( X3.75 )
    X11.5
    Z10.5
    M12
    M09
    M109
    M30

:

[tea hole]

Not sure about if you've run this before and this is a new issue or not, but, i'm fairly certain in sync tapping that the spindle stops before it goes to tap a hole.
Also, i'm not sure about the rest of the world, but i'm lazy, so i leave my tapping cycles in g95 and just give the machine the thread designation for the feedrate: F1/18
That way if someone comes along and changes the RPM, you still get a good thread.
Lastly, my programming manual doesn't specify an E value for the sync tapping line, is that a carry over from something or any specific reason it's in there?

[deadlykitten]

.

[deadlykitten]

Also, i'm not sure about the rest of the world ...

definetly not good : there is a fashion to worry about what others will say

i leave my tapping cycles in g95 and just give the machine the thread designation for the feedrate: F1/18. That way if someone comes along and changes the RPM, you still get a good thread.

i also preffer G95; i understand easier cutting specs from the [ mm / o ] perspective, rather than from [ mm / min ]

F1/18 :
... 400/22.2224=17.999
... 22.2224*25.4/100=1.411mm/o
... 25.4/1.411=18 tpi > yup

if i would program tpi threads, than :

    V1 rpm
    V2 tpi
   ( * )
    ... SB = V1 ...
    G178 XZCIR F +1 / V2 G95

i promised some time ago to share the way i program threads : still working on that meanwhile it got better, but i wait for a finish aspect ; however, at this intermediate state it rocks i have a running setup that delivers stable threads with 0.02 tolerance with an insert that everybody told me to trash it

[deadlykitten]

Lastly, my programming manual doesn't specify an E value for the sync tapping line

you are right, there is no E in sync mode
... what i said was not for G178

and the sample from #1 has E0

[deadlykitten]

i will run some trials next week

i changed inch>mm and run the folowing code on the machine .. it worked

    G00 X500 Z150
    T0505 ( M08 )
    M110
    SB=400 M13
    G00 X3.75*25.4 Z1*25.4 C270 ( X95.25 Z25.4 )
    X2.15*25.4                  ( X54.61       )
    Z-0.5625*25.4               ( Z-14.2875    )
    G178 Z-0.5625*25.4 C270 X-1.02*25.4 I1.95*25.4 F+25.4/18 G95
    G180                   ( X+5.08 ... -25.908 Z-14.2875 I49.53 )
  ( X3.75 )
  ( X11.5 )
  ( Z10.5 )
    M12
  ( M09 )
    M109
    G00 X500 Z150
    M02

also, i simplified it :

    G00 X500 Z150
    T0505
    M110
    SB=400 M13
    G00 X[2.15-1.95]*25.4 Z-0.5625*25.4 C270             ( X5.08 Z-14.2875 C270 )
    G178 Z-0.5625*25.4 C270 X-1.02*25.4 I0 F+25.4/18 G95 ( X-25.908 )
    G180
    M12
    M109
    G00 X500 Z150
    M02

... you may need C270 inside G178; during trials, even if C270 was written before G178, C was index to 0 when tapping

... and as it approached part, rpm drops to maybe 20 and stalls - no movement and no alarms

... about this i don't know what to say
... maybe M and Z can not get within droop
... maybe only M has problems

sorry, but i really don't know / kindly !

[deadlykitten]

samples for osp300 :

    V1 = 400      ( rpm     )
    V2 = +25.4/18 ( pitch   )
    V3 = 60       ( X start )
    V4 = 30       ( X end   )
    V5 = 110      ( Z start )
    V6 = 270      ( C start )

   ( * )

    G00 X375-VETFX Z150-VETFZ M203
    T0505 M110 M08
    SB=V1 M13 G00 X=V3 Z=V5 C=V6 M63
    G178 Z=VSIOZ C=VSIOC X=V4 I0 F=V2 G95 M141
    G180
    G00 X375-VETFX Z150-VETFZ M109 M09


    check_offset_errors
    dynamic_indexing + lookahead_CTR
    SB=V1 M13 G00 X=V3 Z=V5 C=V6 M63
    G178 Z=VSIOZ C=VSIOC X=V4 I0 F=V2 G95 M141

[OkumaWiz]

Tehole is right on the money. G95 is REQUIRED to sync tap since as the M spindle slows down to reverse, the RPM is changing and the only way to keep it in sync is to be feeding in IPR thus G95.

Give that a whirl. I also do the same as teahole with the feedrate.

Best regards,

[TrippH]

Thank you all for the input! When machine free's up, we will try G95...this is a new machine for us and unfortunately, previous owner is unable to help.

[deadlykitten]

Tehole is right on the money. G95 is REQUIRED to sync tap since as the M spindle slows down to reverse, the RPM is changing and the only way to keep it in sync is to be feeding in IPR thus G95

teahole was talking about the case of getting a wrong thread, when rpm inside the program is changed, and feed is designed in G94

sync should work for G94 in the same way as for G95

ps : both of you are right on the $$$

... and unfortunately, previous owner is unable to help

you did not have money to pay the cnc, so ....?

[deadlykitten]

if teahole is saying something, and mr Wizard will develop something from that, and what i say should never contradict mr Wizard, than it means that :


... teahole said something than may be ok
... mr Wizard is always true
... and i did not understand

or

... teahole believes in things that are not real
... mr Wizard is always true
... i did understand

or

... mr Wizard & teahole : always true
... and i really don't understand

or

... mr Wizard or teahole : always true
... maybe i understand

just kitting, there is a lot of help from you both, thank you !