Cutting a line and reversing

Guys-

Operating a Mits FX10 Wire edm, using Camworks/Solidworks as my CAD/CAM, got a quick question....

I'm wanting to cut a part within a piece of metal....and within the piece leave a tab to allow me to skim the part. Now, generally once i rough cut the part, I pull a slug which then the edm skim cuts the part, then cuts the tab. This time I'm wanting to cut in from the outside, cut around the part and say go off perpendicular .100 from the part leaving a small tab. Can/will the wire cut a straight line into metal, say on a G41, then be able to switch G42 without having a "contact" problem/error?

Boy that is hard to explain, I hope someone can follow me on this...

Thanks!

First, a disclaimer: I've never run a Mits, only Charmilles and Brother.

I suspect the answer is no.

Your going to have to cancel your offset (G40)while burning off your profile (say .015"-.030"), and pick up your next G41/G42 burning back to the profile.

At least, that's the way I do it.

Edit: Hmmm ... on rereading your post, more slowly this time, it seems that is what you are describing after all.

Yes, that is how we skim cut "in the gap".

Another method may help if you still can't do as KilrB suggests . . . does your machine support M70 ? This is a 'retrace' command back along the path cut with wire feed on but no power. Then change power settings and cut again. This will work well UNLESS you part distorts too much from stress movement.

I agree with KilrB.Cancel-out your off-set G40.

Red James said:

Another method may help if you still can't do as KilrB suggests . . . does your machine support M70 ? This is a 'retrace' command back along the path cut with wire feed on but no power. Then change power settings and cut again. This will work well UNLESS you part distorts too much from stress movement.

Click to expand...

Neither method will work if the part moves that much.

To combat that he will have to:

1. Add more skim passes.

2. Add a stress relief cut.

3. Have the part stress relieved before cutting.

Sounds good guys, and thank you!

Generally if say I'm cutting a part and leaving a tab...i'm holding the rest of the material (connected to the tab) in say a vice. Usually this is a one part thing, so I cut into the part from out in the tank (versus not in the material) and then cut around the part including the tab, then cut out into the tank again...then change offsets (G40, then G41/G42) and go to skimming. The difference this time is I have 1 piece of material and want to cut 6 parts out of it, Thus I can't cut out into the tank or I'd cut the material off after my 1st rough cut.

Anyways, its hard to describe, but I'm going to have to play around with it more and just try it.

Basically, I was looking to see if you can cut into a piece of metal say 1", then directly cut back out of that line without having to cut sideways to compensate for my G40 move.

If any of you have a picture or two of some tab cuts you think would resemble what I'm talking about I'd appreciate seeing them if you had time!

A set of 6 slotting punches:



... and the g-code:

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N2830 X.8375 Y-.822 J.011
N2835 G1 Y-.1375
N2840 G2 X.85 Y-.125 I.0125
N2845 G1 X.95
N2850 G40 Y-.095
N2855 M50
N2860 G0 X.475 Y0.
N2865 M60
N2867 G92 X.475 Y0.
N2870 S503
N2875 G41 G1 Y.125
N2880 X.375
N2885 G2 X.3625 Y.1375 J.0125
N2890 G1 Y.822
N2895 G2 X.3735 Y.833 I.011
N2900 X.3845 Y.822 J-.011
N2905 G1 Y.365
N2910 G3 X.3945 Y.355 I.01
N2915 G1 X.5165
N2920 G3 X.5265 Y.365 J.01
N2925 G1 Y.822
N2930 G2 X.5375 Y.833 I.011
N2935 X.5485 Y.822 J-.011
N2940 G1 Y.365
N2945 G3 X.5585 Y.355 I.01
N2950 G1 X.6805
N2955 G3 X.6905 Y.365 J.01
N2960 G1 Y.822
N2965 G2 X.7015 Y.833 I.011
N2970 X.7125 Y.822 J-.011
N2975 G1 Y.1375
N2980 G2 X.7 Y.125 I-.0125
N2985 G1 X.6
N2990 G40 Y.095
N2995 S504
N3000 G42 G1 Y.125
N3005 X.7
N3010 G3 X.7125 Y.1375 J.0125
N3015 G1 Y.822
N3020 G3 X.7015 Y.833 I-.011
N3025 X.6905 Y.822 J-.011
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N3035 G2 X.6805 Y.355 I-.01
N3040 G1 X.5585
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N3055 G3 X.5375 Y.833 I-.011
N3060 X.5265 Y.822 J-.011
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N3075 G1 X.3945
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N3085 G1 Y.822
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N3095 X.3625 Y.822 J-.011
N3100 G1 Y.1375
N3105 G3 X.375 Y.125 I.0125
N3110 G1 X.475
N3115 G40 Y.095
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N3140 G1 Y.822
N3145 G2 X.3735 Y.833 I.011
N3150 X.3845 Y.822 J-.011
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N3165 G1 X.5165
N3170 G3 X.5265 Y.365 J.01
N3175 G1 Y.822
N3180 G2 X.5375 Y.833 I.011
N3185 X.5485 Y.822 J-.011
N3190 G1 Y.365
N3195 G3 X.5585 Y.355 I.01
N3200 G1 X.6805
N3205 G3 X.6905 Y.365 J.01
N3210 G1 Y.822
N3215 G2 X.7015 Y.833 I.011
N3220 X.7125 Y.822 J-.011
N3225 G1 Y.1375
N3230 G2 X.7 Y.125 I-.0125
N3235 G1 X.6
N3240 G40 Y.095
N3245 S506
N3250 G42 G1 Y.125
N3255 X.7
N3260 G3 X.7125 Y.1375 J.0125
N3265 G1 Y.822
N3270 G3 X.7015 Y.833 I-.011
N3275 X.6905 Y.822 J-.011
N3280 G1 Y.365
N3285 G2 X.6805 Y.355 I-.01
N3290 G1 X.5585
N3295 G2 X.5485 Y.365 J.01
N3300 G1 Y.822
N3305 G3 X.5375 Y.833 I-.011
N3310 X.5265 Y.822 J-.011
N3315 G1 Y.365
N3320 G2 X.5165 Y.355 I-.01
N3325 G1 X.3945
N3330 G2 X.3845 Y.365 J.01
N3335 G1 Y.822
N3340 G3 X.3735 Y.833 I-.011
N3345 X.3625 Y.822 J-.011
N3350 G1 Y.1375
N3355 G3 X.375 Y.125 I.0125
N3360 G1 X.475
N3365 G40 Y.095
N3370 G0 X.475 Y0.
N3375 M60
N3377 G92 X.475 Y0.
N3380 S503
N3385 G42 G1 Y-.125
N3390 X.375
N3395 G3 X.3625 Y-.1375 J-.0125
N3400 G1 Y-.822
N3405 G3 X.3735 Y-.833 I.011
N3410 X.3845 Y-.822 J.011
N3415 G1 Y-.365
N3420 G2 X.3945 Y-.355 I.01
N3425 G1 X.5165
N3430 G2 X.5265 Y-.365 J-.01
N3435 G1 Y-.822
N3440 G3 X.5375 Y-.833 I.011
N3445 X.5485 Y-.822 J.011
N3450 G1 Y-.365
N3455 G2 X.5585 Y-.355 I.01
N3460 G1 X.6805
N3465 G2 X.6905 Y-.365 J-.01
N3470 G1 Y-.822
N3475 G3 X.7015 Y-.833 I.011
N3480 X.7125 Y-.822 J.011
N3485 G1 Y-.1375
N3490 G3 X.7 Y-.125 I-.0125
N3495 G1 X.6
N3500 G40 Y-.095
N3505 S504
N3510 G41 G1 Y-.125
N3515 X.7
N3520 G2 X.7125 Y-.1375 J-.0125
N3525 G1 Y-.822
N3530 G2 X.7015 Y-.833 I-.011
N3535 X.6905 Y-.822 J.011
N3540 G1 Y-.365
N3545 G3 X.6805 Y-.355 I-.01
N3550 G1 X.5585
N3555 G3 X.5485 Y-.365 J-.01
N3560 G1 Y-.822
N3565 G2 X.5375 Y-.833 I-.011
N3570 X.5265 Y-.822 J.011
N3575 G1 Y-.365
N3580 G3 X.5165 Y-.355 I-.01
N3585 G1 X.3945
N3590 G3 X.3845 Y-.365 J-.01
N3595 G1 Y-.822
N3600 G2 X.3735 Y-.833 I-.011
N3605 X.3625 Y-.822 J.011
N3610 G1 Y-.1375
N3615 G2 X.375 Y-.125 I.0125
N3620 G1 X.475
N3625 G40 Y-.095
N3630 S505
N3635 G42 G1 Y-.125
N3640 X.375
N3645 G3 X.3625 Y-.1375 J-.0125
N3650 G1 Y-.822
N3655 G3 X.3735 Y-.833 I.011
N3660 X.3845 Y-.822 J.011
N3665 G1 Y-.365
N3670 G2 X.3945 Y-.355 I.01
N3675 G1 X.5165
N3680 G2 X.5265 Y-.365 J-.01
N3685 G1 Y-.822
N3690 G3 X.5375 Y-.833 I.011
N3695 X.5485 Y-.822 J.011
N3700 G1 Y-.365
N3705 G2 X.5585 Y-.355 I.01
N3710 G1 X.6805
N3715 G2 X.6905 Y-.365 J-.01
N3720 G1 Y-.822
N3725 G3 X.7015 Y-.833 I.011
N3730 X.7125 Y-.822 J.011
N3735 G1 Y-.1375
N3740 G3 X.7 Y-.125 I-.0125
N3745 G1 X.6
N3750 G40 Y-.095
N3755 S506
N3760 G41 G1 Y-.125
N3765 X.7
N3770 G2 X.7125 Y-.1375 J-.0125
N3775 G1 Y-.822
N3780 G2 X.7015 Y-.833 I-.011
N3785 X.6905 Y-.822 J.011
N3790 G1 Y-.365
N3795 G3 X.6805 Y-.355 I-.01
N3800 G1 X.5585
N3805 G3 X.5485 Y-.365 J-.01
N3810 G1 Y-.822
N3815 G2 X.5375 Y-.833 I-.011
N3820 X.5265 Y-.822 J.011
N3825 G1 Y-.365
N3830 G3 X.5165 Y-.355 I-.01
N3835 G1 X.3945
N3840 G3 X.3845 Y-.365 J-.01
N3845 G1 Y-.822
N3850 G2 X.3735 Y-.833 I-.011
N3855 X.3625 Y-.822 J.011
N3860 G1 Y-.1375
N3865 G2 X.375 Y-.125 I.0125
N3870 G1 X.475
N3875 G40 Y-.095
N3880 M50
N3885 G0 X0. Y0.
N3890 M60
N3892 G92 X0. Y0.
N3895 S503
N3900 G41 G1 Y.125
N3905 X-.1
N3910 G2 X-.1125 Y.1375 J.0125
N3915 G1 Y.822
N3920 G2 X-.1015 Y.833 I.011
N3925 X-.0905 Y.822 J-.011
N3930 G1 Y.365
N3935 G3 X-.0805 Y.355 I.01
N3940 G1 X.0415
N3945 G3 X.0515 Y.365 J.01
N3950 G1 Y.822
N3955 G2 X.0625 Y.833 I.011
N3960 X.0735 Y.822 J-.011
N3965 G1 Y.365
N3970 G3 X.0835 Y.355 I.01
N3975 G1 X.2055
N3980 G3 X.2155 Y.365 J.01
N3985 G1 Y.822
N3990 G2 X.2265 Y.833 I.011
N3995 X.2375 Y.822 J-.011
N4000 G1 Y.1375
N4005 G2 X.225 Y.125 I-.0125
N4010 G1 X.125
N4015 G40 Y.095
N4020 S504
N4025 G42 G1 Y.125
N4030 X.225
N4035 G3 X.2375 Y.1375 J.0125
N4040 G1 Y.822
N4045 G3 X.2265 Y.833 I-.011
N4050 X.2155 Y.822 J-.011
N4055 G1 Y.365
N4060 G2 X.2055 Y.355 I-.01
N4065 G1 X.0835
N4070 G2 X.0735 Y.365 J.01
N4075 G1 Y.822
N4080 G3 X.0625 Y.833 I-.011
N4085 X.0515 Y.822 J-.011
N4090 G1 Y.365
N4095 G2 X.0415 Y.355 I-.01
N4100 G1 X-.0805
N4105 G2 X-.0905 Y.365 J.01
N4110 G1 Y.822
N4115 G3 X-.1015 Y.833 I-.011
N4120 X-.1125 Y.822 J-.011
N4125 G1 Y.1375
N4130 G3 X-.1 Y.125 I.0125
N4135 G1 X0.
N4140 G40 Y.095
N4145 S505
N4150 G41 G1 Y.125
N4155 X-.1
N4160 G2 X-.1125 Y.1375 J.0125
N4165 G1 Y.822
N4170 G2 X-.1015 Y.833 I.011
N4175 X-.0905 Y.822 J-.011
N4180 G1 Y.365
N4185 G3 X-.0805 Y.355 I.01
N4190 G1 X.0415
N4195 G3 X.0515 Y.365 J.01
N4200 G1 Y.822
N4205 G2 X.0625 Y.833 I.011
N4210 X.0735 Y.822 J-.011
N4215 G1 Y.365
N4220 G3 X.0835 Y.355 I.01
N4225 G1 X.2055
N4230 G3 X.2155 Y.365 J.01
N4235 G1 Y.822
N4240 G2 X.2265 Y.833 I.011
N4245 X.2375 Y.822 J-.011
N4250 G1 Y.1375
N4255 G2 X.225 Y.125 I-.0125
N4260 G1 X.125
N4265 G40 Y.095
N4270 S506
N4275 G42 G1 Y.125
N4280 X.225
N4285 G3 X.2375 Y.1375 J.0125
N4290 G1 Y.822
N4295 G3 X.2265 Y.833 I-.011
N4300 X.2155 Y.822 J-.011
N4305 G1 Y.365
N4310 G2 X.2055 Y.355 I-.01
N4315 G1 X.0835
N4320 G2 X.0735 Y.365 J.01
N4325 G1 Y.822
N4330 G3 X.0625 Y.833 I-.011
N4335 X.0515 Y.822 J-.011
N4340 G1 Y.365
N4345 G2 X.0415 Y.355 I-.01
N4350 G1 X-.0805
N4355 G2 X-.0905 Y.365 J.01
N4360 G1 Y.822
N4365 G3 X-.1015 Y.833 I-.011
N4370 X-.1125 Y.822 J-.011
N4375 G1 Y.1375
N4380 G3 X-.1 Y.125 I.0125
N4385 G1 X0.
N4390 G40 Y.095
N4395 G0 X0. Y0.
N4400 M60
N4402 G92 X0. Y0.
N4405 S503
N4410 G42 G1 Y-.125
N4415 X-.1
N4420 G3 X-.1125 Y-.1375 J-.0125
N4425 G1 Y-.822
N4430 G3 X-.1015 Y-.833 I.011
N4435 X-.0905 Y-.822 J.011
N4440 G1 Y-.365
N4445 G2 X-.0805 Y-.355 I.01
N4450 G1 X.0415
N4455 G2 X.0515 Y-.365 J-.01
N4460 G1 Y-.822
N4465 G3 X.0625 Y-.833 I.011
N4470 X.0735 Y-.822 J.011
N4475 G1 Y-.365
N4480 G2 X.0835 Y-.355 I.01
N4485 G1 X.2055
N4490 G2 X.2155 Y-.365 J-.01
N4495 G1 Y-.822
N4500 G3 X.2265 Y-.833 I.011
N4505 X.2375 Y-.822 J.011
N4510 G1 Y-.1375
N4515 G3 X.225 Y-.125 I-.0125
N4520 G1 X.125
N4525 G40 Y-.095
N4530 S504
N4535 G41 G1 Y-.125
N4540 X.225
N4545 G2 X.2375 Y-.1375 J-.0125
N4550 G1 Y-.822
N4555 G2 X.2265 Y-.833 I-.011
N4560 X.2155 Y-.822 J.011
N4565 G1 Y-.365
N4570 G3 X.2055 Y-.355 I-.01
N4575 G1 X.0835
N4580 G3 X.0735 Y-.365 J-.01
N4585 G1 Y-.822
N4590 G2 X.0625 Y-.833 I-.011
N4595 X.0515 Y-.822 J.011
N4600 G1 Y-.365
N4605 G3 X.0415 Y-.355 I-.01
N4610 G1 X-.0805
N4615 G3 X-.0905 Y-.365 J-.01
N4620 G1 Y-.822
N4625 G2 X-.1015 Y-.833 I-.011
N4630 X-.1125 Y-.822 J.011
N4635 G1 Y-.1375
N4640 G2 X-.1 Y-.125 I.0125
N4645 G1 X0.
N4650 G40 Y-.095
N4655 S505
N4660 G42 G1 Y-.125
N4665 X-.1
N4670 G3 X-.1125 Y-.1375 J-.0125
N4675 G1 Y-.822
N4680 G3 X-.1015 Y-.833 I.011
N4685 X-.0905 Y-.822 J.011
N4690 G1 Y-.365
N4695 G2 X-.0805 Y-.355 I.01
N4700 G1 X.0415
N4705 G2 X.0515 Y-.365 J-.01
N4710 G1 Y-.822
N4715 G3 X.0625 Y-.833 I.011
N4720 X.0735 Y-.822 J.011
N4725 G1 Y-.365
N4730 G2 X.0835 Y-.355 I.01
N4735 G1 X.2055
N4740 G2 X.2155 Y-.365 J-.01
N4745 G1 Y-.822
N4750 G3 X.2265 Y-.833 I.011
N4755 X.2375 Y-.822 J.011
N4760 G1 Y-.1375
N4765 G3 X.225 Y-.125 I-.0125
N4770 G1 X.125
N4775 G40 Y-.095
N4780 S506
N4785 G41 G1 Y-.125
N4790 X.225
N4795 G2 X.2375 Y-.1375 J-.0125
N4800 G1 Y-.822
N4805 G2 X.2265 Y-.833 I-.011
N4810 X.2155 Y-.822 J.011
N4815 G1 Y-.365
N4820 G3 X.2055 Y-.355 I-.01
N4825 G1 X.0835
N4830 G3 X.0735 Y-.365 J-.01
N4835 G1 Y-.822
N4840 G2 X.0625 Y-.833 I-.011
N4845 X.0515 Y-.822 J.011
N4850 G1 Y-.365
N4855 G3 X.0415 Y-.355 I-.01
N4860 G1 X-.0805
N4865 G3 X-.0905 Y-.365 J-.01
N4870 G1 Y-.822
N4875 G2 X-.1015 Y-.833 I-.011
N4880 X-.1125 Y-.822 J.011
N4885 G1 Y-.1375
N4890 G2 X-.1 Y-.125 I.0125
N4895 G1 X0.
N4900 G40 Y-.095
N4905 S501
N4910 G1 Y-.125
N4915 X.125
N4920 M00
N4925 G0 X0.
N4930 G0 X0. Y0.
N4935 M60
N4940 G1 Y.125
N4945 X.125
N4950 M00
N4955 M50
N4960 G0 X.475 Y0.
N4965 M60
N4970 G1 Y-.125
N4975 X.6
N4980 M00
N4985 G0 X.475
N4990 G0 X.475 Y0.
N4995 M60
N5000 G1 Y.125
N5005 X.6
N5010 M00
N5015 M50
N5020 G0 X.95 Y0.
N5025 M60
N5030 G1 Y-.125
N5035 X1.075
N5040 M00
N5045 G0 X.95
N5050 G0 X.95 Y0.
N5055 M60
N5060 G1 Y.125
N5065 X1.075
N5070 M00
N5075 M50
N5080 M30
%

Bradracer18 said:

Guys-

I'm wanting to cut a part within a piece of metal....and within the piece leave a tab to allow me to skim the part. Now, generally once i rough cut the part, I pull a slug which then the edm skim cuts the part, then cuts the tab. This time I'm wanting to cut in from the outside, cut around the part and say go off perpendicular .100 from the part leaving a small tab. Can/will the wire cut a straight line into metal, say on a G41, then be able to switch G42 without having a "contact" problem/error?

Click to expand...

is there a reason you do not want to use a start hole?

When you rough the contour, make a short move away from it. Cancel the offset and dwell for a few seconds. The dwell is to make sure that the wire is not in contact when you make the next move.

Hi All:
My apologies first of all for being offline for so long; I've been setting up the new shop with the new business partner and the new systems, so there's been no time to participate.

Anyway, to get back to bradracer's topic:
There are a few ways to do this, and I've tried most of them at one time or another.
The simplest way is to write the program as a main program with a subroutine or subprogram call, and simply break , return to the start point, then rethread the wire and call the sub, rather than backing up with alternating programs using G41 then G42.
Of course, you need a good autothreader to make this a viable proposition, but it saves a terrific amount of farting about with code, and has become my Go-To method.
It also easily enables making a pattern of parts without the hassle of writing and inspecting mountains of code, and can be easily edited to include or exclude individual components in the pattern.

Way number 2 is to use the position of the wire after the first pass (including it's G40 last move), and simply use it as the start position of the new path you write to run the contour in reverse.
This avoids a wire break which may be an advantage, but the code gets more complicated because you've got two subs to keep track of and invoke at the proper time with the correct offsets and offset directions, and it's easier to make a mistake especially on a pattern of parts, but not overwhelmingly so.
It also supposedly, has the benefit of creating a more accurate part because of the reversal of wire lag effects and machine positioning accuracy, but I'm not sure I believe that it makes a practical difference.

The third way is to deliberately create a little opening at the end point of the first pass by running a slugless routine to make a bigger hole than the wire slot.
This can be a useful workaround if your wire threader is not so hot and you need a reliable opening to thread into for tab cutoff or whatever, but don't want to go to the trouble of making a wire start hole specifically for that purpose.
This is especially helpful if your workpiece is thick, or prone to stress release and distortion.
I used this method exclusively on my manually threaded old Sodick A320, and it worked very well.
My new machine has a great autothreader so I don't bother anymore except when I'm cutting thick titanium or 303 stainless (both of which often warp like crazy from stress release after the roughing cut).
That's about it in a nutshell; there may be other ways I haven't tried yet, but these have worked for me.
Cheers

Marcus
Implant Mechanix – Design & Innovation - home
Vancouver Wire EDM -- Wire EDM Machining
Home

Thanks all, I appreciate the advice! I never thought about just cutting wire, and re-running the program with skims....I guess I assumed maybe I might lose some sort of tolerance that way....and my machine has to drain tank to thread, takes about couple minutes to rethread.

And to the guy who asked, I don't want a start hole because there isn't room. The piece of metal is just large enough to get 2 parts side by side out of. And its around 4" thick, so I don't want to fart around trying to drill a real small hole...


I'm going to mess around with this some more in the next week or so! Thanks for the the help, I sure like to learn from you guys!
Brad

You may be able to try an M70 code for retrace to start point. As long as your start point is the start hole, unless you are cutting the part out not using a start hole and working from outside the block inwards. (not sure if that makes sense). This program cuts a square starting from where the start hole is as x0.0 y0.0, it starts a retrace when it hits the tab point, then stops via G40.



%
O0001
N100 G0 G20 G90
N110 G92 X0. Y0.
N120 G0 X0. Y0.
N160 S101 D1
N170 G42 G1 X-.25
N180 Y.5
N190 X-1.25
N200 Y-.5
N210 X-.25
N220 Y-.1 M70 (Some machines may not run this code the same way)
N230 G40 X0. Y0. M00 (program stop at 0,0)
N240 S102 D2
N250 G42 G1 X-.25 Y.02
N260 Y.5
N270 X-1.25
N280 Y-.5
N290 X-.25
N300 Y-.1
N310 M00 (Tab position)
N320 Y0. (Part off)
N330 Y.02 (overlap)
N340 G40 X0. Y0.
N350 M50
N360 M30
%

If you start from a corner of a block as the 0,0 and run M70, in the program, that usually means the wire will retrace all the way back to that point.

Red James said:

Another method may help if you still can't do as KilrB suggests . . . does your machine support M70 ? This is a 'retrace' command back along the path cut with wire feed on but no power. Then change power settings and cut again. This will work well UNLESS you part distorts too much from stress movement.

Click to expand...

I guess what I said has been said. If you want help with CAD/Program that may do what you want, message me.

Bradracer18 said:

Guys-
Operating a Mits FX10 Wire edm, using Camworks/Solidworks as my CAD/CAM, got a quick question....
I'm wanting to cut a part within a piece of metal....and within the piece leave a tab to allow me to skim the part. Now, generally once i rough cut the part, I pull a slug which then the edm skim cuts the part, then cuts the tab. This time I'm wanting to cut in from the outside, cut around the part and say go off perpendicular .100 from the part leaving a small tab. Can/will the wire cut a straight line into metal, say on a G41, then be able to switch G42 without having a "contact" problem/error?
Boy that is hard to explain, I hope someone can follow me on this...
Thanks!

Click to expand...

The resolution of the issue is two part. The first is understanding that CamWorks isn't set up to do this correctly ( as far as I know and have experienced ). The second is understanding how Mitsi's work in real life application and how to make them work for you.

The first part of your problem - It has been some time, but last I checked CamWorks in SolidWorks and BobCAM in SolidWorks are fairly identical. Once I discovered that, I didn't bother looking at CamWorks any further due to such a HUGE price difference between the two. ( Why pay 3x for the same thing? ) Still, while I was trying both out I noticed that they will not let you call out or activate an offset without making you use a Link/Lead.

THAT is my guess at why you are not seeing the forest for the trees.

The second part is that I know some other softwares do not have/have corrected this issue so as to avoid it. ( BobCAD V19 lets one do it and I believe V27 has been made to work the same way) One can also simply hand edit the code if you know what you are looking for while using CamWorks/Anything else.

Basically, you can make the Mitsi enter an offset without commanding a move other than the actual offset distances. So, one would call the Epack, offset, and Feed up, and THEN call the coordinates that affect a move to the offset amount. Since the amount is so small ( relatively speaking ) and the Wire is hot and cutting, this small move will not hurt anything.

Example -

%
G90
G14X6P5
( STORE-CURRENT-TIME-IN-VAR-H6 )
M20
G30X1
( CENTER-FIND-HOLE )
G14X3Y4
(STORE-RESULT-IN-VAR-H3-&-H4 )
G43G54XH3YH4
( STORE-VAR-H3-&-H4-IN-G54-X0Y0 )
G54
G52 XH3YH4
( ACTIVATE-&-MOVE-INTO-G54 )
M85 M88 M83 M81
( MACHINING-OFF-HUGH-PRESS-OFF-FLUID-OFF-WIRE-OFF)
( ROUGHING-PASS )
E504 H1=.0062 F.315 Call up the Epack and settings
H1
M80 M82 M84 (WIRE-ON-FLUID-ON-MACHINING-ON) Turn everything on
G01 X-0.01 Y0. G41 Move over a little bit while running to allow room and then turn on the offset
X-0.01 Y-0.396
G03 X0. Y-0.406 I0.01 J0.
<snip>

It works fine in real life. But if you are exceptionally anal or have some other contributing issue then you can also call a variable to lower your tension and wire speed briefly while it is doing so, then restore them for actual cutting.

Hope that helps!

Sethrocon said:

You may be able to try an M70 code for retrace to start point. As long as your start point is the start hole, unless you are cutting the part out not using a start hole and working from outside the block inwards. (not sure if that makes sense). This program cuts a square starting from where the start hole is as x0.0 y0.0, it starts a retrace when it hits the tab point, then stops via G40.

View attachment 118769

%
O0001
N100 G0 G20 G90
N110 G92 X0. Y0.
N120 G0 X0. Y0.
N160 S101 D1
N170 G42 G1 X-.25
N180 Y.5
N190 X-1.25
N200 Y-.5
N210 X-.25
N220 Y-.1 M70 (Some machines may not run this code the same way)
N230 G40 X0. Y0. M00 (program stop at 0,0)
N240 S102 D2
N250 G42 G1 X-.25 Y.02
N260 Y.5
N270 X-1.25
N280 Y-.5
N290 X-.25
N300 Y-.1
N310 M00 (Tab position)
N320 Y0. (Part off)
N330 Y.02 (overlap)
N340 G40 X0. Y0.
N350 M50
N360 M30
%

If you start from a corner of a block as the 0,0 and run M70, in the program, that usually means the wire will retrace all the way back to that point.

Click to expand...

I am attempting to retrace a cut using the M70 command, but I'm not totally clear on how it should be used. (Running an Accutex wire EDM in Mitsubishi mode.) It looks like it requires using a G92 offset? I noticed that MasterCAM automatically puts in G92 commands with the post processor we're using, but I could never figure out why, and have been leaving them out when writing code by hand.

G92 sets your absolute coordinates to whatever numbers you have on that line. In the case of this quoted program, X0 Y0. I've never used a G70 command, but I'm assuming it retraces back to the G92 position, so that's why it's needed.