5 replies to this topic

[M_CODE1]

We recently purchased an EDM at an auction and need some pointers on it.  It is a Mitsubishi model DWC90SB.  Most of us here do not have any experience with EDM's and the book did not seem to helpful.  The part we are cutting is .50"  4140 and has about 4.1" of cutting length.  The first part we cut took about 3 hours.  That would come out to about .022 IPM.  We do not have a tight surface finish to hold, just a profile tolerance of .0015 in certain sections of the cut.  Below is the program that we used to cut the profile.  What exactly controls the feed during the program?  The E101?  What kind of IPM can you run of .50 steel?  Does anyone have any charts that might help me?  Thanks for any help that you might be able to give.  


%
L1000
(06/07/12)
(NO STOCK ON TOOTH)
G90
G92 X2.135 Y.0625
M20 (WIRE INSERT)
M78 (RAPID FLUID FILL)
M80 (DIELECTRIC FLUID ON)
M82 (WIRE FEED ON)
M84 (MACHINING ON POWER ON)
E101
M90 (STARTS ADAPTIVE CONTROL)
G41 H1=.006 G1 X2.085 H1
Y-.035
X2.4576
X3.024 Y-.36201
G2 X3.0315 Y-.375 I-.0075 J-.01299
X3.0165 Y-.39 I-.015 J0.
G1 X2.5412
G3 X2.54286 Y-.3748 I-.0687 J.0152
X2.4725 Y-.30444 I-.07036 J0.
X2.40214 Y-.3748 I0. J-.07036
X2.40998 Y-.40708 I.07036 J0.
G1 X2.41 Y-.40732
Y-.525
G2 X2.395 Y-.54 I-.015 J0.
G1 X2.12378
G2 X2.10884 Y-.52631 I0. J.015
G1 X2.0979 Y-.40161
G3 X2.1032 Y-.3748 I-.0651 J.02681
X2.0328 Y-.3044 I-.0704 J0.
X1.9624 Y-.3748 I0. J-.0704
X1.96588 Y-.39668 I.0704 J0.
X1.76799 Y-.44886 I.29412 J-1.51672
X1.73445 Y-.4754 I.02001 J-.05974
G2 X1.27469 Y-.73931 I-.47445 J.2941
G3 X1.23909 Y-.75145 I.00161 J-.06299
X.94342 Y-1.03881 I.91941 J-1.24175
G40 G1 X.98281 Y-1.06974

M91 (ADAPTIVE FEED OFF)
M21 (WIRE CUT)
M58 (DIELECRIC FLUID TO LOWER LEVEL)
M02 (PROGRAM END)
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[lpetrisor]

Hi ...
  What you have to do is to take look in the book --- technology book that came with the machine for the cut technology ...  and used proper E-pack  (E101 is just reference ) for the type of material you use  for the thickness ( .5" in your case ) , wire Dia .... and the most important is to have the upper head closer to the part ... also run full open the water flow gages.This type of machine cuts actually fast .... and if I remember has only 2 or 3 surfaces finish.
I hope this helps .

[Del.]

I'm not familiar with the Mitz but for .5 thick cut you should at least get a rough rate of close to .25 ipm. Are your cutting conditions set correctly in machine?

[chip]

I don't have as much experience as some of these guys.... but on a Mitsubishi, I don't think there's a feed rate (command) like you might be used to. It takes parameters from the e-pack and senses the cut through power-flushing. I was getting my feet wet, the boys at Mitsubishi are really kuhl and might give you some advise.

Wires are kuhl once you get operating. X-periment with wire thicknesses too.  

[chip]

I'm wondering, if you dont give it an e-pack, if it defaults to the previous setting. Also in the parameters you might be able to override the e-pack while its running. But  you have to look in the Manuel for the abreviations.. the only time I wanted to slow the machine down is for wire contact or breakage, I sort of played around with flushing pressure...

[Oppiz]

I see he's running adaptive control M90. This controls the feed rate to maintain a consistent over burn. I run Mits but FX and FA. Do you the tech. book for your machine?