Possible canned cycle bug?
15 Oct 2021 02:47 #223150
by JR1050
Possible canned cycle bug? was created by JR1050
Hi, while I would like to try the new G71 coding, right now Ive been using standard canned cycles for simple basic roughing or just programming it all offline, that being said , I have this code for my jaw boring routine.
%
(BORE JAWS)
G20 G7 G18
G28 G91 X0
T6 M6
G95
G55 G43 G90
G97 S1462 M4
G0 X2.0 Z0.2M8
G96 D2500 S550 M4
G17X2.0Z.2
Z.03
G81G99R.03Z-.49F.01
G91X.1L89
G80G90
G18
G0X10.95
Z.05
G1Z-.5F.003
X1.75
G0Z.5M9
M5G28 G91 X0
Z6.
G90G49
M30
I use a G81 cycle with an incremental step to ruff diameters, G83 also works well if you have stringy material that doesnt like to chip break, works on OD/ID.
Issue: when using an incremental step for each pass, the cycle doesn’t cut to depth, in the above code, the final z depth should be -.49, when it in fact only cuts .43 deep. It seems as though lcnc is adding the .030 R distance twice and subtracting it from the final z depth. to get a depth of .49, Z had to be programmed to -.55. Is this a bug? Did I miss something? Ive been programming Fanuc type controls since 1991, never ran into this one. Suggestions? Thanks
%
(BORE JAWS)
G20 G7 G18
G28 G91 X0
T6 M6
G95
G55 G43 G90
G97 S1462 M4
G0 X2.0 Z0.2M8
G96 D2500 S550 M4
G17X2.0Z.2
Z.03
G81G99R.03Z-.49F.01
G91X.1L89
G80G90
G18
G0X10.95
Z.05
G1Z-.5F.003
X1.75
G0Z.5M9
M5G28 G91 X0
Z6.
G90G49
M30
I use a G81 cycle with an incremental step to ruff diameters, G83 also works well if you have stringy material that doesnt like to chip break, works on OD/ID.
Issue: when using an incremental step for each pass, the cycle doesn’t cut to depth, in the above code, the final z depth should be -.49, when it in fact only cuts .43 deep. It seems as though lcnc is adding the .030 R distance twice and subtracting it from the final z depth. to get a depth of .49, Z had to be programmed to -.55. Is this a bug? Did I miss something? Ive been programming Fanuc type controls since 1991, never ran into this one. Suggestions? Thanks
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15 Oct 2021 22:52 #223252
by andypugh
Replied by andypugh on topic Possible canned cycle bug?
I have only ever used G81 / G83 for drilling holes and boring. It is just possible that I have never noticed this issue.
Just to check, if you jog up to the shoulder does it definitely show 0.43 rather than 0.49 on the DRO?
Just to check, if you jog up to the shoulder does it definitely show 0.43 rather than 0.49 on the DRO?
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16 Oct 2021 02:27 - 16 Oct 2021 02:29 #223271
by JR1050
Replied by JR1050 on topic Possible canned cycle bug?
I should probably add that this issue appears only when the step is in incremental , G91X.1L50. watching the dro, I want to say the dro says .43, even if the Z is programmed to .49. Ill make a short video tomrw.
In absolute, the z depths function as expected.
example
X2.Z.2
G90
G81Z-.5R.03F.01
X2.2
X2.3
X2.4
ect, will bore down .5 as would be expected.
In absolute, the z depths function as expected.
example
X2.Z.2
G90
G81Z-.5R.03F.01
X2.2
X2.3
X2.4
ect, will bore down .5 as would be expected.
Last edit: 16 Oct 2021 02:29 by JR1050.
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