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Wire EDM Slot tapers top to bottom.

nlancaster

Aluminum
Joined
Oct 8, 2018
Hello,

I am new to wire EDM and we are cutting a slot that is about 4 inches deep and cuts into the material .125.

The slot at the top of the part is running .00985 and the slott at the bottom of the part is running about .00950.

So top to bottom the slot narrows about .00035.

.0060 wire running at 105 decameters per minute. Would increasing the wire speed reduce this taper?
 
Increasing wire speed could decrease the taper as the wire erosion would be less. More passes with decreasing power and offset on each may be required to get it much better.
 
Yes...increasing the wire speed should help. What type of machine are you running? Some machines have a taper offset feature that tilts the wire slightly to compensate for this.
 
Sodick AG600L
5 passes total already running.
The conditions section of the code does list

H999 = + 00000.00200 (Taper Offset);

All the other offset conditions are in inches, no reason to expect this one to be metric.
could someone previously have tried to fix it?
And so far I have been unable to locate the section in the huge number of manuals that talks about it.
 
We have one of these machines as well. If there is a taper offset, type BSAH999 below the last offset in the header. Be sure your Table to lower and table upper are set correctly. And make sure you have the correct height set in program. Below is an example of a 1.000" thick part sitting on table zero. This works really well and will eliminate your issue.


( Search Data : LQ,Water,D0.010in,Brass,Al,H1.18in,Punch,Close,4,3orMore );
;
( ON OFF IP HRP MAO SV V SF C PIK CTRL WK WT WS WP);

C000 = 011 014 2215 000 250 040 8 0047 0 000 0000 025 160 130 045;
C001 = 013 014 2215 000 282 030 8 0047 0 000 0000 025 160 130 055;
C002 = 002 023 2215 000 751 048 8 6028 0 000 0000 025 160 130 012;
C903 = 000 001 1015 000 000 030 6 7024 0 008 0000 025 160 130 012;
H000 = +000000.000390;
H001 = +000000.009800;
H002 = +000000.006460;
H003 = +000000.005280;
H004 = +000000.007420
H999 = +000000.002000 ( Taper Offset );
BSAH999
;
;
N0000;
;
TP1.0;
TN0.0;
G90;
G92 X0.0 Y0.0 U0.0 V0.0;
;
(Database name: AG600L.xml);
;
(Fluid: Water);
(WireDiameter: 0.010);
(WireMaterial: Brass);
(WorkpieceMaterial: Al);
(Thickness: 1.18);
(MachiningType: Punch);
(NozzlePosition: Close);
(Condition: 3orMore);
(FinishRy: 4);
 
Also, that offset isn't metric. Its is the taper angle the machine uses. This is for a LN2W control. If you have a LQ33W control there is more that has to be edited in the program to get the offset.
 
yeah "BSAH999" is not set in the program, as well as there are no TP or TN set in the program.
We increased he wire speed to 125 decameters per minute and the kerf taper is acceptable now.
 
Good to hear... You may want to consider to start using the 'BSA" feature. It really does work great. I didn't use it at first and was having the same issue you are having. This completely eliminated the taper. Our parts are true from top to bottom.
 
Shane any hints on how to calculate the taper to use with BSA? as these parts are on the second to final step before customer, so they are quite valuable.
 
Last edited:
There should be a program on your hard drive called LNTPRDAT (there is a newer version call TDTL Guide set up calibration also). This program works with the angled slot on your wire aligning block. Instructions are in the program and is easy to do. This will automatically calculate your table to lower and table to upper for accurate taper cutting. If you don't have the program, PM me your email and ill send it to you.

In your program TABLE TO PROGRAM is the top of the taper. TABLE TO NEXT is the lower. So if you have a 2.000" part sitting on the table, TP would be 2.000 and TN would be 0.0. If you have a 2.000" part sitting .250" above the table. TP would be 2.250 and TN would be .250. Hope this helps.
 
I too run a Sodick Wire EDM. I have a AQ537L and use the BSA setting quite often. I don't know if it is just my machine or a setting somewhere but it will not engage unless I use condition settings with a part over 4in. Im new to the forum and just wanted to add some input. The BSA is a great feature to utilize when needed.
 
Sorry...I haven't ran a Mits since the mid 90's. Not sure if their newer machines have this or not??
 
So, we have started experimenting with the BSA feature on a new part.

We get a slot that is .010 at the top, and .0095 at the bottom.

Would I set the BSA offset to .00025 or .0005?
 








 
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