[shags72]

I understand the D word is an optional retract amount in this and the G83 cycle but I really want to know if not in the code, what is the machine doing? Does it just do a quick dwell or does the controller have a default distance that the tool retracts if not specified. I couldn't find it in the programming manual.

PS What would the parameter be that controls the "C" rotary moving shortest distance? Thanks.

[Superman]

The D word in the canned cycles is controlled by a parameter setting
the G73 and the G83 look at different parameters

If D is not stated in the NC code, then these default values are used.
For metric, the D value for the G73 is 0.200 & the G83 is 0.500 ( but you may need to verify these values )

You need to look in the manual ( I think the Operation manual ) for that control to find the correct location
Same would apply for the 4th axis, shortest distance, address


Forgot to ask, is this for a lathe, or a mill ?
just clicked :idea:, read the "C" axis, usually the main spindle on the lathes...

[Maxter]

The Okuma control uses a "Specification of return-point" (G71)
Example using the G71/M53 combo:
...
G71 Z.1
G83 X0 Y0 R-.5 Z-1 F.005 M53
X1 Y1
...


The Okuma control lets you only select the direction of rotation via M15/M16.
Here is an untested "intelligent A axis program" that I made for our MC-V4020 machine that might be of use to you:

(INTELLIGENT A AXIS ROTATION)
(VC41= START POS, VC42= END POS)
VC41=[DROUND[VAPAA-VMOFA-VZOFA[VACOD]]]
IF[VC41 GT 0]N0
VC41=360-ABS[VC41]
N0 IF[VC41 LT VC42]N1
CCW=360-VC41+VC42
CW=VC41-VC42
GOTO NEXT
N1 CCW=VC42-VC41
CW=360-VC42+VC41
NEXT M15 (CCW)
IF[CCW LT CW]N9
M16 (CW)
N9 A=VC42
NEND M2

[Maxter]

Thanks Superman, I forgot the D.

NC Optional Parameter (long word) #2 D default of 1000 = .039" retract for G83.

I changed my #1 default from 500 to 100 which = .01 G73 retract. (Enough to break the chip)

[shags72]

Hey thanks everyone! It is a 5 axis HMC with B table and C rotary on tombstone. I am glad to know where I might find the parameters that control this so I know for sure what it is doing. We are using the G71 in our with G53. I will be looking in the op manual to check these. Thanks again.