18i-mb helix

[EHA]

We just got a new Yama Seiki Mill with the 18i-mb controller on it. We are trying to rough a id with a helix. We have tried using an edgecam program and a program that we wrote longhand. When it is running, you can watch your x and y values increase with each revolution that it makes, like it is doing a spiral. It is feeding down in the z correctly, but just wont stay on course in the x and y. This controller has conical, spiral and helical interpolation on. Anybody else had this problem?

[dcoupar]

Could you post that section of code so we might see what's wrong and possibly offer some assistance?

[EHA]

T2 M6
G00 G54 G90 X0. Y0. S2500 M3
G43 H2 Z.1 D2
G00 G41 X4.225
G1 Z.005 F10.
G3 X4.225 I-4.225 Z-.985 L10 F300.
G3 X4.225 I-4.225
G00 Z1.
G40
M9
G91 G28 Z0.
G91 G28 Z0.
M30

Thanks for your help!!

[dcoupar]

Several thoughts:

Do you really mean to be helixing -.985 in Z each time around, or 0.985 total depth?

I don't see in the 18i-MB Operators Manual that L is a valid "repeat" command... you may have to do this in a sub with a repeat value.


T2 M6
G00 G54 G90 X0. Y0. S2500 M3
G43 H2 Z.1 D2
G00 G41 X4.225
G1 Z.005 F10.
M98 P0102005 (REJPEAT SUB 2005 10 TIMES)
G3 I-4.225 (ONE PASS AT FINAL DEPTH)
G00 G90 Z1.
G40
M9
G91 G28 Z0.
G91 G28 Z0.
M30

O2005(HELICAL SUB)
G91 G3 I-4.225 Z-.0985 F300.
M99

[EHA]

z-.985 is the final z depth. It's worked with this machine putting the final z depth and then the L number is the number of rev's it makes to get to that, producing a cut increment of .0985. I'll try this sub program and see what it does. I greatly appreciate it!!!

[buildyourown]

Can you change your post or CAM settings to output small point to point moves? This is how I've always done it.

[EHA]

The sub program worked. I just don't know if I can get Edgecam to output the program that way. Hard telling. Thanks for your help guys!