Citizen L32 programming question on using G75

[jimwjr89]

I have a Citizen L32 with a mitsubishi Meldas series 500 control. I wanted to use the G75 cycle for chip breaking in the Z axis . I keep getting a program error and I am not sure on what format to enter in my P Q R numbers is it in decimal form or 4 digits. If any one has a program example that woulkd be appreciated . What I would like to do is start at a .400 dia. and cut a straight line in th z axis .700 taking maybe .030 at a pass or whaytever I need to do to control the chips.

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[deadlykitten]

hello pls find attached infos about g75

is this what you are looking for ? to cut the part, or a groove ? or you wish for the LFV ?

if it is about:
... cutting/grooving, i never use g75, but simple g-code, for more control; if you wish, i will share an example
... LFV, then i may select infos from the manuals, and share it to you; i just searched, there is something, but it seems to be much more, in comparison to g75

What I would like to do is start at a .400 dia. and cut a straight line in th z axis .700 taking maybe .030 at a pass or whaytever I need to do to control the chips.

i saw this later, it seems you are looking for LFV ... infos are spread all over the manuals, i will search later today

until then, just try this :
... increase your feed
... decrease your rpms

chips are broken by increasing the feed; also, if you work at an rpm that breaks your chips, increasing the rpm may no longer break them, but make them tangle arround ... thus a greater rpm may break your chips at a higher feed rate

i would start with a minimal M/min, and increase the feed

however, some soft materials simply don't break easy into smaller chips; i will be back with infos on LFV / kindly

[machinehop5]

...using a "-" sign can cause a problem sometimes with P's and Q's or K's in canned cycles...depends on CNC.

[jimwjr89]

hello pls find attached infos about g75

is this what you are looking for ? to cut the part, or a groove ? or you wish for the LFV ?

if it is about:
... cutting/grooving, i never use g75, but simple g-code, for more control; if you wish, i will share an example
... LFV, then i may select infos from the manuals, and share it to you; i just searched, there is something, but it seems to be much more, in comparison to g75



i saw this later, it seems you are looking for LFV ... infos are spread all over the manuals, i will search later today

until then, just try this :
... increase your feed
... decrease your rpms

chips are broken by increasing the feed; also, if you work at an rpm that breaks your chips, increasing the rpm may no longer break them, but make them tangle arround ... thus a greater rpm may break your chips at a higher feed rate

i would start with a minimal M/min, and increase the feed

however, some soft materials simply don't break easy into smaller chips; i will be back with infos on LFV / kindly

My machine does not have the LFV but with the G75 i am looking to do kind of the same thing. I do it all the time on our Fanuc controlled Lathes. I am just looking to straight turning, I have tried everything with feeds and speeds but the material just does not break up consistently to run unattended.

[machinehop5]

hire a pro..

[rcs60]

If you can use macro's try this it works well on a mitsubishi m70




G0X.400Z-.05
G1Z0.F.0025


#100=0(start point)
#101=.030(peck dist.)
#102=.700(depth)
#103=.003(chip break)

WHILE[#100LT#102]DO1

IF[#100LT#102]GOTO100
#100=#103(IF #100 GE #103 MAKE #100 THE SAME AS #103)(THIS AVOIDS OVER RUNNING THE FINAL DIM.)
N100



G1Z[#100+#101]F.0025
G1W-#103(BREAK CHIP could be a dwell also to break the chip)


#100=#100+#101
END1

G1X.500
G0Z-.1

[deadlykitten]

hy jim, please, what are you doing on the fanuc, that you wish to do also on the mitshubishi/citizen ?

is it similar to the code shared by rcs ?

the material just does not break up consistently to run unattended

if possible, use an endmill to cut a longitudinal groove : this should break the chips when turning; obviously, this will require to lower your turning specs, and use an insert that can handle that bump, but may deliver a ' clean ' part

another trick may be to rough towards reverse_Z, thus the oposite way ( may require an insert with bigger nose radius, so not to break during plunging ); this won't break your chips, but may throw them into the chipconveyor;

* in both cases, may be required to adjust your operation in respect to guide bushing length / kindly

[jimwjr89]

If you can use macro's try this it works well on a mitsubishi m70




G0X.400Z-.05
G1Z0.F.0025


#100=0(start point)
#101=.030(peck dist.)
#102=.700(depth)
#103=.003(chip break)

WHILE[#100LT#102]DO1

IF[#100LT#102]GOTO100
#100=#103(IF #100 GE #103 MAKE #100 THE SAME AS #103)(THIS AVOIDS OVER RUNNING THE FINAL DIM.)
N100



G1Z[#100+#101]F.0025
G1W-#103(BREAK CHIP could be a dwell also to break the chip)


#100=#100+#101
END1

G1X.500
G0Z-.1

Thanks it worked out well

[rcs60]

your welcome

[deadlykitten]

hello again, recently i was talking with someone about this, and other solutions involves:
... cutting a "thread" with a relative big doc and lead ( at least > feed of turning operation )
... lfv tuned so to avoid ( or minimize ) air cut in order to extend tool life, but still break the chip / kindly

[chupop]

Y axis turning tool will throw the chips down towards conveyor. All you need is a code. G140X=Y1 Y=X1 Z=Z1. G141 at the end of program to cancel. Program as regular X turning. Just put Y0. In clearance at start. T300
G0 X.5 Z-.05 Y0. T3